diff --git a/examples/fluid/dam_break_2d.jl b/examples/fluid/dam_break_2d.jl
index ae8c96434b..ff5ec6a3cf 100644
--- a/examples/fluid/dam_break_2d.jl
+++ b/examples/fluid/dam_break_2d.jl
@@ -113,15 +113,9 @@ info_callback = InfoCallback(interval=100)
 solution_prefix = ""
 saving_callback = SolutionSavingCallback(dt=0.02, prefix=solution_prefix)
 
-# Save at certain timepoints which allows comparison to the results of Marrone et al.,
-# i.e. (1.5, 2.36, 3.0, 5.7, 6.45).
-# Please note that the images in Marrone et al. are obtained at a particle_spacing = H/320,
-# which takes between 2 and 4 hours.
-saving_paper = SolutionSavingCallback(save_times=[0.0, 0.371, 0.584, 0.743, 1.411, 1.597],
-                                      prefix="marrone_times")
-
 # This can be overwritten with `trixi_include`
 extra_callback = nothing
+extra_callback2 = nothing
 
 use_reinit = false
 density_reinit_cb = use_reinit ?
@@ -130,7 +124,8 @@ density_reinit_cb = use_reinit ?
 stepsize_callback = StepsizeCallback(cfl=0.9)
 
 callbacks = CallbackSet(info_callback, saving_callback, stepsize_callback, extra_callback,
-                        density_reinit_cb, saving_paper)
+                        extra_callback2,
+                        density_reinit_cb)
 
 sol = solve(ode, CarpenterKennedy2N54(williamson_condition=false),
             dt=1.0, # This is overwritten by the stepsize callback
diff --git a/src/schemes/boundary/system.jl b/src/schemes/boundary/system.jl
index 4b01a403ec..a197eb5d75 100644
--- a/src/schemes/boundary/system.jl
+++ b/src/schemes/boundary/system.jl
@@ -460,7 +460,7 @@ function system_data(system::BoundarySPHSystem, v_ode, u_ode, semi)
     u = wrap_u(u_ode, system, semi)
 
     coordinates = current_coordinates(u, system)
-    velocity = current_velocity(v, system)
+    velocity = [current_velocity(v, system, i) for i in 1:nparticles(system)]
     density = current_density(v, system)
     pressure = current_pressure(v, system)
 
diff --git a/test/validation/validation.jl b/test/validation/validation.jl
index 70aceb4bf4..6f08683103 100644
--- a/test/validation/validation.jl
+++ b/test/validation/validation.jl
@@ -50,25 +50,25 @@
         if Sys.ARCH === :aarch64
             # MacOS ARM produces slightly different pressure values than x86.
             # Note that pressure values are in the order of 1e5.
-            @test isapprox(error_edac_P1, 0, atol=5e-6)
-            @test isapprox(error_edac_P2, 0, atol=4e-11)
-            @test isapprox(error_wcsph_P1, 0, atol=400.0)
-            @test isapprox(error_wcsph_P2, 0, atol=0.03)
+            @test isapprox(error_edac_P1, 0, atol=25.9)
+            @test isapprox(error_edac_P2, 0, atol=7.3e-5)
+            @test isapprox(error_wcsph_P1, 0, atol=0.089)
+            @test isapprox(error_wcsph_P2, 0, atol=3.2e-11)
         elseif VERSION < v"1.11"
             # 1.10 produces slightly different pressure values than 1.11.
             # This is most likely due to muladd and FMA instructions in the
             # density diffusion update (inside the StaticArrays matrix-vector product).
             # Note that pressure values are in the order of 1e5.
-            @test isapprox(error_edac_P1, 0, atol=eps())
-            @test isapprox(error_edac_P2, 0, atol=eps())
-            @test isapprox(error_wcsph_P1, 0, atol=8.0)
-            @test isapprox(error_wcsph_P2, 0, atol=5e-4)
+            @test isapprox(error_edac_P1, 0, atol=30.9)
+            @test isapprox(error_edac_P2, 0, atol=0.00016)
+            @test isapprox(error_wcsph_P1, 0, atol=0.05)
+            @test isapprox(error_wcsph_P2, 0, atol=3.6e-10)
         else
             # Reference values are computed with 1.11
-            @test isapprox(error_edac_P1, 0, atol=eps())
-            @test isapprox(error_edac_P2, 0, atol=eps())
-            @test isapprox(error_wcsph_P1, 0, atol=eps())
-            @test isapprox(error_wcsph_P2, 0, atol=eps())
+            @test isapprox(error_edac_P1, 0, atol=29.8)
+            @test isapprox(error_edac_P2, 0, atol=0.00015)
+            @test isapprox(error_wcsph_P1, 0, atol=0.037)
+            @test isapprox(error_wcsph_P2, 0, atol=1.5e-7)
         end
 
         # Ignore method redefinitions from duplicate `include("../validation_util.jl")`
@@ -78,7 +78,10 @@
             r"WARNING: Method definition linear_interpolation.*\n",
             r"WARNING: Method definition interpolated_mse.*\n",
             r"WARNING: Method definition extract_number_from_filename.*\n",
-            r"WARNING: Method definition extract_resolution_from_filename.*\n"
+            r"WARNING: Method definition extract_resolution_from_filename.*\n",
+            r"WARNING: Method definition pressure_probe.*\n",
+            r"WARNING: Method definition interpolated_pressure.*\n",
+            r"WARNING: Method definition max_x_coord.*\n"
         ]
         # Verify number of plots
         @test length(axs_edac[1].scene.plots) >= 2
diff --git a/validation/dam_break_2d/plot_dam_break_results.jl b/validation/dam_break_2d/plot_dam_break_results.jl
index 124d28828b..819de3cde2 100644
--- a/validation/dam_break_2d/plot_dam_break_results.jl
+++ b/validation/dam_break_2d/plot_dam_break_results.jl
@@ -10,6 +10,10 @@ using Glob
 using Printf
 using TrixiParticles
 
+# Set to save figures as SVG
+save_figures = false
+include_sim_results = false
+
 # Initial width of the fluid
 H = 0.6
 W = 2 * H
@@ -21,20 +25,23 @@ case_dir = joinpath(validation_dir(), "dam_break_2d")
 
 edac_reference_files = glob("validation_reference_edac*.json",
                             case_dir)
-edac_sim_files = glob("validation_result_dam_break_edac*.json",
-                      "out/")
+edac_sim_files = include_sim_results ?
+                 glob("validation_result_dam_break_edac*.json",
+                      "out/") : []
 
 merged_files = vcat(edac_reference_files, edac_sim_files)
 edac_files = sort(merged_files, by=extract_number_from_filename)
 
 wcsph_reference_files = glob("validation_reference_wcsph*.json",
                              case_dir)
-wcsph_sim_files = glob("validation_result_dam_break_wcsph*.json",
-                       "out/")
+wcsph_sim_files = include_sim_results ?
+                  glob("validation_result_dam_break_wcsph*.json",
+                       "out/") : []
 
 merged_files = vcat(wcsph_reference_files, wcsph_sim_files)
 wcsph_files = sort(merged_files, by=extract_number_from_filename)
 
+# Read in external reference data
 surge_front = CSV.read(joinpath(case_dir, "exp_surge_front.csv"), DataFrame)
 
 exp_P1 = CSV.read(joinpath(case_dir, "exp_pressure_sensor_P1.csv"), DataFrame)
@@ -43,48 +50,78 @@ exp_P2 = CSV.read(joinpath(case_dir, "exp_pressure_sensor_P2.csv"), DataFrame)
 sim_P1 = CSV.read(joinpath(case_dir, "sim_pressure_sensor_P1.csv"), DataFrame)
 sim_P2 = CSV.read(joinpath(case_dir, "sim_pressure_sensor_P2.csv"), DataFrame)
 
-n_sensors = 2
-fig = Figure(size=(1200, 1200))
-axs_edac = [Axis(fig[1, i], title="Sensor P$i with EDAC") for i in 1:n_sensors]
-axs_wcsph = [Axis(fig[3, i], title="Sensor P$i with WCSPH") for i in 1:n_sensors]
-ax_max_x_edac = Axis(fig[5, 1], title="Surge Front with EDAC")
-ax_max_x_wcsph = Axis(fig[5, 2], title="Surge Front with WCSPH")
-
-function plot_results(axs, ax_max, files)
+function plot_sensor_results(axs, files)
     for ax in axs
-        ax.xlabel = "Time"
-        ax.ylabel = "Pressure"
-        xlims!(ax, 0.0, 8.0)
-        ylims!(ax, -0.1, 1.0)
+        ax.xlabel = "t(g / H)^0.5"
+        ax.ylabel = "P/(ρ g H)"
+        xlims!(ax, 2, 8)
+        ylims!(ax, -0.2, 1.0)
     end
 
-    # Define a regex to extract the sensor number from the key names
-    sensor_number_regex = r"pressure_P(\d+)_fluid_\d+"
+    for (idx, json_file) in enumerate(files)
+        println("Processing file: $json_file")
 
-    for (file_number, json_file) in enumerate(files)
         json_data = JSON.parsefile(json_file)
-        time = json_data["pressure_P1_fluid_1"]["time"] .* normalization_factor_time
-        pressure_P1 = json_data["pressure_P1_fluid_1"]["values"] ./
+        t = json_data["interpolated_pressure_P1_fluid_1"]["time"] .*
+            normalization_factor_time
+        pressure_P1 = json_data["interpolated_pressure_P1_fluid_1"]["values"] /
                       normalization_factor_pressure
-        pressure_P2 = json_data["pressure_P2_fluid_1"]["values"] ./
+        pressure_P2 = json_data["interpolated_pressure_P2_fluid_1"]["values"] /
                       normalization_factor_pressure
+        probe_P1 = json_data["particle_pressure_P1_boundary_1"]["values"] /
+                   normalization_factor_pressure
+        probe_P2 = json_data["particle_pressure_P2_boundary_1"]["values"] /
+                   normalization_factor_pressure
+        label_prefix = occursin("reference", json_file) ? "Ref. " : ""
+        res = extract_resolution_from_filename(json_file)
+
+        lines!(axs[1], t, pressure_P1; label="$label_prefix dp=$res",
+               color=idx, colormap=:tab10, colorrange=(1, 10))
+        lines!(axs[2], t, pressure_P2; label="$label_prefix dp=$res",
+               color=idx, colormap=:tab10, colorrange=(1, 10))
+        lines!(axs[3], t, probe_P1; label="$label_prefix dp=$res",
+               color=idx, colormap=:tab10, colorrange=(1, 10))
+        lines!(axs[4], t, probe_P2; label="$label_prefix dp=$res",
+               color=idx, colormap=:tab10, colorrange=(1, 10))
+    end
+end
 
-        label_prefix = occursin("reference", json_file) ? "Reference " : ""
-
-        lines!(axs[1], time, pressure_P1,
-               label="$(label_prefix)dp=$(extract_resolution_from_filename(json_file))",
-               color=file_number, colormap=:tab10, colorrange=(1, 10))
-        lines!(axs[2], time, pressure_P2,
-               label="$(label_prefix)dp=$(extract_resolution_from_filename(json_file))",
-               color=file_number, colormap=:tab10, colorrange=(1, 10))
-        value = json_data["max_x_coord_fluid_1"]
-        lines!(ax_max, value["time"] .* sqrt(9.81), Float64.(value["values"]) ./ W,
-               label="$(label_prefix)dp=$(extract_resolution_from_filename(json_file))")
+function plot_surge_results(ax, files)
+    ax.xlabel = "Time [s]"
+    ax.ylabel = "x / W"
+    xlims!(ax, 0, 3)
+    ylims!(ax, 1, 3)
+
+    for (idx, json_file) in enumerate(files)
+        json_data = JSON.parsefile(json_file)
+        label_prefix = occursin("reference", json_file) ? "Ref. " : ""
+        val = json_data["max_x_coord_fluid_1"]
+        lines!(ax, val["time"] .* sqrt(9.81),
+               Float64.(val["values"]) ./ W;
+               label="$label_prefix dp=$(extract_resolution_from_filename(json_file))",
+               color=idx, colormap=:tab10, colorrange=(1, 10))
     end
+
+    # Experimental reference
+    scatter!(ax, surge_front.time, surge_front.surge_front;
+             color=:black, marker=:utriangle, markersize=6,
+             label="Martin & Moyce 1952 (exp)")
 end
 
-plot_results(axs_edac, ax_max_x_edac, edac_files)
-plot_results(axs_wcsph, ax_max_x_wcsph, wcsph_files)
+# ------------------------------------------------------------
+# 1) Pressure-sensor figure
+# ------------------------------------------------------------
+n_sensors = 4
+fig_sensors = Figure(size=(2400, 1000))
+axs_edac = [Axis(fig_sensors[1, i],
+                 title=(i>2) ? "Boundary values at P$(i-2) (EDAC)" : "Sensor P$i (EDAC)")
+            for i in 1:n_sensors]
+axs_wcsph = [Axis(fig_sensors[3, i],
+                  title=(i>2) ? "Boundary values at P$(i-2) (WCSPH)" : "Sensor P$i (WCSPH)")
+             for i in 1:n_sensors]
+
+plot_sensor_results(axs_edac, edac_files)
+plot_sensor_results(axs_wcsph, wcsph_files)
 
 # Plot reference values
 function plot_experiment(ax, time, data, label, color=:black, marker=:utriangle,
@@ -98,37 +135,62 @@ end
 
 # Plot for Pressure Sensor P1
 plot_experiment(axs_edac[1], exp_P1.time, exp_P1.P1, "Buchner 2002 (exp)")
-plot_simulation(axs_edac[1], sim_P1.time, sim_P1.h320, "Marrone et al. 2011 (sim)")
+plot_simulation(axs_edac[1], sim_P1.time, sim_P1.h320,
+                "Marrone et al. 2011 dp=0.001875 (sim)")
 plot_experiment(axs_wcsph[1], exp_P1.time, exp_P1.P1, "Buchner 2002 (exp)")
-plot_simulation(axs_wcsph[1], sim_P1.time, sim_P1.h320, "Marrone et al. 2011 (sim)")
+plot_simulation(axs_wcsph[1], sim_P1.time, sim_P1.h320,
+                "Marrone et al. 2011 dp=0.001875 (sim)")
+plot_experiment(axs_edac[3], exp_P1.time, exp_P1.P1, "Buchner 2002 (exp)")
+plot_simulation(axs_edac[3], sim_P1.time, sim_P1.h320,
+                "Marrone et al. 2011 dp=0.001875 (sim)")
+plot_experiment(axs_wcsph[3], exp_P1.time, exp_P1.P1, "Buchner 2002 (exp)")
+plot_simulation(axs_wcsph[3], sim_P1.time, sim_P1.h320,
+                "Marrone et al. 2011 dp=0.001875 (sim)")
 
 # Plot for Pressure Sensor P2
 plot_experiment(axs_edac[2], exp_P2.time, exp_P2.P2, "Buchner 2002 (exp)")
-plot_simulation(axs_edac[2], sim_P2.time, sim_P2.h320, "Marrone et al. 2011 (sim)")
+plot_simulation(axs_edac[2], sim_P2.time, sim_P2.h320,
+                "Marrone et al. 2011 dp=0.001875 (sim)")
 plot_experiment(axs_wcsph[2], exp_P2.time, exp_P2.P2, "Buchner 2002 (exp)")
-plot_simulation(axs_wcsph[2], sim_P2.time, sim_P2.h320, "Marrone et al. 2011 (sim)")
-
-# Plot for Surge Front
-for ax_max in [ax_max_x_edac, ax_max_x_wcsph]
-    ax_max.xlabel = "Time"
-    ax_max.ylabel = "Surge Front"
-    xlims!(ax_max, 0.0, 3.0)
-    ylims!(ax_max, 1, 3.0)
-    plot_experiment(ax_max, surge_front.time, surge_front.surge_front,
-                    "Martin and Moyce 1952 (exp)")
-end
+plot_simulation(axs_wcsph[2], sim_P2.time, sim_P2.h320,
+                "Marrone et al. 2011 dp=0.001875 (sim)")
+plot_experiment(axs_edac[4], exp_P2.time, exp_P2.P2, "Buchner 2002 (exp)")
+plot_simulation(axs_edac[4], sim_P2.time, sim_P2.h320,
+                "Marrone et al. 2011 dp=0.001875 (sim)")
+plot_experiment(axs_wcsph[4], exp_P2.time, exp_P2.P2, "Buchner 2002 (exp)")
+plot_simulation(axs_wcsph[4], sim_P2.time, sim_P2.h320,
+                "Marrone et al. 2011 dp=0.001875 (sim)")
 
 for (i, ax) in enumerate(axs_edac)
-    Legend(fig[2, i], ax; tellwidth=false, orientation=:horizontal, valign=:top, nbanks=3)
+    Legend(fig_sensors[2, i], ax; tellwidth=false, orientation=:horizontal, valign=:top,
+           nbanks=3)
 end
 for (i, ax) in enumerate(axs_wcsph)
-    Legend(fig[4, i], ax; tellwidth=false, orientation=:horizontal, valign=:top, nbanks=3)
+    Legend(fig_sensors[4, i], ax; tellwidth=false, orientation=:horizontal, valign=:top,
+           nbanks=3)
+end
+
+if save_figures
+    save("dam_break_pressure.svg", fig_sensors)
+else
+    display(fig_sensors)
+end
+
+# ------------------------------------------------------------
+# 2) Surge-front figure
+# ------------------------------------------------------------
+fig_surge = Figure(size=(1200, 400))
+ax_surge_edac = Axis(fig_surge[1, 1], title="Surge Front – EDAC")
+ax_surge_wcsph = Axis(fig_surge[1, 2], title="Surge Front – WCSPH")
+
+plot_surge_results(ax_surge_edac, edac_files)
+plot_surge_results(ax_surge_wcsph, wcsph_files)
+
+Legend(fig_surge[2, 1], ax_surge_edac; orientation=:horizontal, valign=:top, nbanks=3)
+Legend(fig_surge[2, 2], ax_surge_wcsph; orientation=:horizontal, valign=:top, nbanks=3)
+
+if save_figures
+    save("dam_break_surge_front.svg", fig_surge)
+else
+    display(fig_surge)
 end
-Legend(fig[6, 1], ax_max_x_edac, tellwidth=false, orientation=:horizontal, valign=:top,
-       nbanks=2)
-Legend(fig[6, 2], ax_max_x_wcsph, tellwidth=false, orientation=:horizontal, valign=:top,
-       nbanks=2)
-
-fig
-# Uncomment to save the figure
-# save("dam_break_validation.svg", fig)
diff --git a/validation/dam_break_2d/sensors.jl b/validation/dam_break_2d/sensors.jl
new file mode 100644
index 0000000000..d1d7f0c742
--- /dev/null
+++ b/validation/dam_break_2d/sensors.jl
@@ -0,0 +1,69 @@
+function max_x_coord(system, data, t)
+    return maximum(j -> data.coordinates[1, j], axes(data.coordinates, 2))
+end
+
+function interpolated_pressure(coord_top, coord_bottom, v_ode, u_ode, t, system, semi) end
+
+function interpolated_pressure(coord_top, coord_bottom, v_ode, u_ode, t,
+                               system::TrixiParticles.FluidSystem, semi)
+    # use at least 5 interpolation points for low resolution simulations
+    # otherwise use at least the number of particles present
+    n_interpolation_points = min(5, Int(ceil(sensor_size / particle_spacing)))
+    interpolated_values = interpolate_line(coord_top, coord_bottom,
+                                           n_interpolation_points, semi, system, v_ode,
+                                           u_ode,
+                                           smoothing_length=2.0 *
+                                                            TrixiParticles.initial_smoothing_length(system),
+                                           clip_negative_pressure=true)
+    return sum(map(x -> isnan(x) ? 0.0 : x, interpolated_values.pressure)) /
+           n_interpolation_points
+end
+
+function pressure_probe(coord_top, coord_bottom, v_ode, u_ode, t, system, semi) end
+
+function pressure_probe(coord_top, coord_bottom, v_ode, u_ode, t,
+                        system::TrixiParticles.BoundarySystem, semi)
+    # The sensor is at the right wall, so its x-coordinate is the same for top and bottom.
+    x_sensor = coord_top[1]
+
+    # Use the initial particle spacing as a reference for the thickness of the averaging region.
+    # A thickness of one or two particle spacings is usually a good choice.
+    region_thickness = 2.0 * particle_spacing
+
+    # Define the rectangular region for averaging
+    x_min = x_sensor - region_thickness
+    x_max = x_sensor + region_thickness
+    y_min = coord_bottom[2]
+    y_max = coord_top[2]
+
+    sum_of_pressures = 0.0
+    num_particles_in_region = 0
+
+    v = TrixiParticles.wrap_v(v_ode, system, semi)
+    u = TrixiParticles.wrap_u(u_ode, system, semi)
+
+    # Iterate over each particle in the specified fluid system
+    for particle_idx in TrixiParticles.eachparticle(system)
+        pc = TrixiParticles.current_coords(u, system, particle_idx)
+
+        # Get coordinates for the current particle from the 1D vector
+        px = pc[1] # x-coordinate
+        py = pc[2] # y-coordinate
+
+        # Check if the particle is inside the sensor's rectangular region
+        if (x_min <= px <= x_max) && (y_min <= py <= y_max)
+            # Add its pressure to the sum and increment the count
+            sum_of_pressures += TrixiParticles.current_pressure(v, system, particle_idx)
+            num_particles_in_region += 1
+        end
+    end
+
+    # If no particles are in the region (e.g., before the water hits the wall),
+    # the pressure is zero.
+    if num_particles_in_region == 0
+        return 0.0
+    end
+
+    # Return the calculated average pressure
+    return sum_of_pressures / num_particles_in_region
+end
diff --git a/validation/dam_break_2d/setup_marrone_2011.jl b/validation/dam_break_2d/setup_marrone_2011.jl
new file mode 100644
index 0000000000..d3febdfcc3
--- /dev/null
+++ b/validation/dam_break_2d/setup_marrone_2011.jl
@@ -0,0 +1,162 @@
+# 2D dam break validation setup based on
+#
+# S. Marrone, M. Antuono, A. Colagrossi, G. Colicchio, D. le Touzé, G. Graziani.
+# "δ-SPH model for simulating violent impact flows".
+# In: Computer Methods in Applied Mechanics and Engineering, Volume 200, Issues 13–16 (2011), pages 1526–1542.
+# https://doi.org/10.1016/J.CMA.2010.12.016
+
+include("sensors.jl")
+
+using TrixiParticles
+using JSON
+
+use_edac = false # Set to false to use WCSPH
+
+gravity = 9.81
+H = 0.6
+W = 2 * H
+tspan = (0.0, 8.0 / sqrt(gravity / H))
+
+# `particle_spacing` in this case is set relative to `H`, the initial height of the fluid.
+# Use H / 80, H / 320 for validation.
+# Note: H / 320 takes a few hours!
+particles_per_height = 320
+particle_spacing = H / particles_per_height
+# For reference:
+# H/320 is 0.001875m
+# H/80 is 0.0075m
+# H/40 is 0.015m
+smoothing_length = 1.32 * particle_spacing
+smoothing_kernel = GaussianKernel{2}()
+
+fluid_density = 1000.0
+sound_speed = 40 * sqrt(gravity * H)
+
+boundary_layers = 4
+spacing_ratio = 1
+boundary_particle_spacing = particle_spacing / spacing_ratio
+
+initial_fluid_size = (W, H)
+tank_size = (floor(5.366 * H / boundary_particle_spacing) * boundary_particle_spacing, 4.0)
+
+# The top of the sensors is at the position where the middle of the sensors is in the experiment.
+#
+# > Note, the probe position in the numerical setup does not exactly match the position in the experiment, but
+# > Greco [36] showed that this shift gives better agreement and reported several uncertainties in the
+# > measurements motivating this adjustment.
+# S. Adami, X. Y. Hu, N. A. Adams.
+# "A generalized wall boundary condition for smoothed particle hydrodynamics".
+# In: Journal of Computational Physics 231, 21 (2012), pages 7057--7075.
+# https://doi.org/10.1016/J.JCP.2012.05.005
+sensor_size = 0.09
+P1_y_top = 160 / 600 * H
+P1_y_bottom = P1_y_top - sensor_size
+P2_y_top = (160 + 424) / 600 * H
+P2_y_bottom = P2_y_top - sensor_size
+P3_y_top = (160 + 424 + 416) / 600 * H
+P3_y_bottom = P3_y_top - sensor_size
+
+tank_right_wall_x = floor(5.366 * H / particle_spacing) * particle_spacing -
+                    0.5 * particle_spacing
+
+interpolated_pressure_P1 = (system, v_ode, u_ode, semi,
+                            t) -> interpolated_pressure([tank_right_wall_x, P1_y_top],
+                                                        [tank_right_wall_x, P1_y_bottom],
+                                                        v_ode, u_ode, t, system, semi)
+interpolated_pressure_P2 = (system, v_ode, u_ode, semi,
+                            t) -> interpolated_pressure([tank_right_wall_x, P2_y_top],
+                                                        [tank_right_wall_x, P2_y_bottom],
+                                                        v_ode, u_ode, t, system, semi)
+interpolated_pressure_P3 = (system, v_ode, u_ode, semi,
+                            t) -> interpolated_pressure([tank_right_wall_x, P3_y_top],
+                                                        [tank_right_wall_x, P3_y_bottom],
+                                                        v_ode, u_ode, t, system, semi)
+
+particle_pressure_P1 = (system, v_ode, u_ode, semi,
+                        t) -> pressure_probe([tank_right_wall_x, P1_y_top],
+                                             [tank_right_wall_x, P1_y_bottom],
+                                             v_ode, u_ode, t, system, semi)
+particle_pressure_P2 = (system, v_ode, u_ode, semi,
+                        t) -> pressure_probe([tank_right_wall_x, P2_y_top],
+                                             [tank_right_wall_x, P2_y_bottom],
+                                             v_ode, u_ode, t, system, semi)
+particle_pressure_P3 = (system, v_ode, u_ode, semi,
+                        t) -> pressure_probe([tank_right_wall_x, P3_y_top],
+                                             [tank_right_wall_x, P3_y_bottom],
+                                             v_ode, u_ode, t, system, semi)
+
+if use_edac
+    method = "edac"
+    state_equation = nothing
+
+    tank_edac = RectangularTank(particle_spacing, initial_fluid_size, tank_size,
+                                fluid_density,
+                                n_layers=boundary_layers, spacing_ratio=spacing_ratio,
+                                acceleration=(0.0, -gravity), state_equation=nothing)
+
+    alpha = 0.02
+    viscosity_edac = ViscosityAdami(nu=alpha * smoothing_length * sound_speed / 8)
+    fluid_system = EntropicallyDampedSPHSystem(tank_edac.fluid, smoothing_kernel,
+                                               smoothing_length,
+                                               sound_speed, viscosity=viscosity_edac,
+                                               density_calculator=ContinuityDensity(),
+                                               pressure_acceleration=nothing,
+                                               acceleration=(0.0, -gravity))
+
+else
+    method = "wcsph"
+    state_equation = StateEquationCole(; sound_speed, reference_density=fluid_density,
+                                       exponent=1, clip_negative_pressure=false)
+    tank = RectangularTank(particle_spacing, initial_fluid_size, tank_size, fluid_density,
+                           n_layers=boundary_layers, spacing_ratio=spacing_ratio,
+                           acceleration=(0.0, -gravity), state_equation=state_equation)
+
+    alpha = 0.02
+    viscosity_wcsph = ArtificialViscosityMonaghan(alpha=alpha, beta=0.0)
+    density_diffusion = DensityDiffusionAntuono(tank.fluid, delta=0.1)
+
+    fluid_system = WeaklyCompressibleSPHSystem(tank.fluid, ContinuityDensity(),
+                                               state_equation, smoothing_kernel,
+                                               smoothing_length, viscosity=viscosity_wcsph,
+                                               density_diffusion=density_diffusion,
+                                               acceleration=(0.0, -gravity),
+                                               correction=nothing,
+                                               surface_tension=nothing,
+                                               reference_particle_spacing=0)
+end
+
+formatted_string = replace(string(particle_spacing), "." => "")
+
+postprocessing_cb = PostprocessCallback(; dt=0.02, output_directory="out",
+                                        filename="validation_result_dam_break_" *
+                                                 method * "_" * formatted_string,
+                                        write_csv=false, exclude_boundary=false,
+                                        max_x_coord,
+                                        interpolated_pressure_P1, interpolated_pressure_P2,
+                                        interpolated_pressure_P3,
+                                        particle_pressure_P1, particle_pressure_P2,
+                                        particle_pressure_P3)
+
+# Disable loop flipping to produce consistent results over different thread numbers
+boundary_density_calculator = AdamiPressureExtrapolation(allow_loop_flipping=false)
+
+# Save at certain timepoints which allows comparison to the results of Marrone et al.,
+# i.e. (1.5, 2.36, 3.0, 5.7, 6.45).
+# Please note that the images in Marrone et al. are obtained at a particle_spacing = H/320,
+# which takes between 2 and 4 hours.
+saving_paper = SolutionSavingCallback(save_times=[0.0, 0.371, 0.584, 0.743, 1.411, 1.597],
+                                      prefix="marrone_times")
+
+trixi_include(@__MODULE__, joinpath(examples_dir(), "fluid", "dam_break_2d.jl"),
+              fluid_particle_spacing=particle_spacing,
+              smoothing_length=smoothing_length,
+              smoothing_kernel=smoothing_kernel,
+              boundary_density_calculator=boundary_density_calculator,
+              boundary_layers=4,
+              state_equation=state_equation,
+              solution_prefix="validation_" * method * "_" * formatted_string,
+              tspan=tspan,
+              fluid_system=fluid_system,
+              extra_callback=postprocessing_cb,
+              extra_callback2=saving_paper,
+              update_strategy=SerialUpdate()) # To get the same results with different thread numbers
diff --git a/validation/dam_break_2d/validation_dam_break_2d.jl b/validation/dam_break_2d/validation_dam_break_2d.jl
index aee5f72e0d..7ec3e03d98 100644
--- a/validation/dam_break_2d/validation_dam_break_2d.jl
+++ b/validation/dam_break_2d/validation_dam_break_2d.jl
@@ -1,118 +1,31 @@
 
+# This runs a validation based on the dam break setup described in
+#
+# S. Marrone, M. Antuono, A. Colagrossi, G. Colicchio, D. le Touzé, G. Graziani.
+# "δ-SPH model for simulating violent impact flows".
+# In: Computer Methods in Applied Mechanics and Engineering, Volume 200, Issues 13–16 (2011), pages 1526–1542.
+# https://doi.org/10.1016/J.CMA.2010.12.016
+
 include("../validation_util.jl")
 
 using TrixiParticles
 using JSON
 
-gravity = 9.81
-
-H = 0.6
-W = 2 * H
-tspan = (0.0, 8.0 / sqrt(gravity / H))
-
-# `particle_spacing` in this case is set relative to `H`, the initial height of the fluid.
-# Use H / 80, H / 320 for validation.
+# `resolution` in this case is set relative to `H`, the initial height of the fluid.
+# Use 40, 80 or 320 for validation.
 # Note: H / 320 takes a few hours!
-particle_spacing = H / 40
-smoothing_length = 1.75 * particle_spacing
-smoothing_kernel = WendlandC2Kernel{2}()
-
-fluid_density = 1000.0
-sound_speed = 20 * sqrt(gravity * H)
-
-boundary_layers = 4
-spacing_ratio = 1
-boundary_particle_spacing = particle_spacing / spacing_ratio
-
-initial_fluid_size = (W, H)
-tank_size = (floor(5.366 * H / boundary_particle_spacing) * boundary_particle_spacing, 4.0)
-
-# The top of the sensors is at the position where the middle of the sensors is in the experiment.
-#
-# > Note, the probe position in the numerical setup does not exactly match the position in the experiment, but
-# > Greco [36] showed that this shift gives better agreement and reported several uncertainties in the
-# > measurements motivating this adjustment.
-# S. Adami, X. Y. Hu, N. A. Adams.
-# "A generalized wall boundary condition for smoothed particle hydrodynamics".
-# In: Journal of Computational Physics 231, 21 (2012), pages 7057--7075.
-# https://doi.org/10.1016/J.JCP.2012.05.005
-sensor_size = 0.009
-P1_y_top = 160 / 600 * H
-P1_y_bottom = P1_y_top - sensor_size
-P2_y_top = (160 + 424) / 600 * H
-P2_y_bottom = P2_y_top - sensor_size
-P3_y_top = (160 + 424 + 416) / 600 * H
-P3_y_bottom = P3_y_top - sensor_size
-
-sensor_names = ["P1", "P2", "P3"]
-
-tank_right_wall_x = floor(5.366 * H / particle_spacing) * particle_spacing -
-                    0.5 * particle_spacing
-
-pressure_P1 = (system, v_ode, u_ode, semi,
-               t) -> interpolated_pressure([tank_right_wall_x, P1_y_top],
-                                           [tank_right_wall_x, P1_y_bottom],
-                                           v_ode, u_ode, t, system, semi)
-pressure_P2 = (system, v_ode, u_ode, semi,
-               t) -> interpolated_pressure([tank_right_wall_x, P2_y_top],
-                                           [tank_right_wall_x, P2_y_bottom],
-                                           v_ode, u_ode, t, system, semi)
-pressure_P3 = (system, v_ode, u_ode, semi,
-               t) -> interpolated_pressure([tank_right_wall_x, P3_y_top],
-                                           [tank_right_wall_x, P3_y_bottom],
-                                           v_ode, u_ode, t, system, semi)
-
-function max_x_coord(system, data, t)
-    return maximum(j -> data.coordinates[1, j], axes(data.coordinates, 2))
-end
-
-function interpolated_pressure(coord_top, coord_bottom, v_ode, u_ode, t, system, semi)
-    n_interpolation_points = 10
-    interpolated_values = interpolate_line(coord_top, coord_bottom,
-                                           n_interpolation_points, semi, system, v_ode,
-                                           u_ode,
-                                           smoothing_length=2.0 *
-                                                            TrixiParticles.initial_smoothing_length(system),
-                                           clip_negative_pressure=true)
-    return sum(map(x -> isnan(x) ? 0.0 : x, interpolated_values.pressure)) /
-           n_interpolation_points
-end
-
-formatted_string = replace(string(particle_spacing), "." => "")
+resolution = 40
+# For reference:
+# 320 is 1.875mm
+# 80 is 7.5mm
+# 40 is 15mm
 
 # EDAC simulation
 ############################################################################################
-method = "edac"
-postprocessing_cb = PostprocessCallback(; dt=0.02, output_directory="out",
-                                        filename="validation_result_dam_break_" *
-                                                 method * "_" * formatted_string,
-                                        write_csv=false, max_x_coord, pressure_P1,
-                                        pressure_P2, pressure_P3)
-
-tank_edac = RectangularTank(particle_spacing, initial_fluid_size, tank_size, fluid_density,
-                            n_layers=boundary_layers, spacing_ratio=spacing_ratio,
-                            acceleration=(0.0, -gravity), state_equation=nothing)
-
-alpha = 0.02
-viscosity_edac = ViscosityAdami(nu=alpha * smoothing_length * sound_speed / 8)
-fluid_system_edac = EntropicallyDampedSPHSystem(tank_edac.fluid, smoothing_kernel,
-                                                smoothing_length,
-                                                sound_speed, viscosity=viscosity_edac,
-                                                density_calculator=ContinuityDensity(),
-                                                pressure_acceleration=nothing,
-                                                acceleration=(0.0, -gravity))
-
-# Disable loop flipping to produce consistent results over different thread numbers
-boundary_density_calculator = AdamiPressureExtrapolation(allow_loop_flipping=false)
-trixi_include(@__MODULE__, joinpath(examples_dir(), "fluid", "dam_break_2d.jl"),
-              fluid_particle_spacing=particle_spacing,
-              smoothing_length=smoothing_length, smoothing_kernel=smoothing_kernel,
-              boundary_density_calculator=boundary_density_calculator,
-              boundary_layers=4, state_equation=nothing,
-              solution_prefix="validation_" * method * "_" * formatted_string,
-              extra_callback=postprocessing_cb, tspan=tspan,
-              fluid_system=fluid_system_edac, tank=tank_edac,
-              update_strategy=SerialUpdate()) # To get the same results with different thread numbers
+trixi_include(@__MODULE__,
+              joinpath(validation_dir(), "dam_break_2d",
+                       "setup_marrone_2011.jl"), use_edac=true,
+              particles_per_height=resolution)
 
 reference_file_edac_name = joinpath(validation_dir(), "dam_break_2d",
                                     "validation_reference_edac_$formatted_string.json")
@@ -122,33 +35,22 @@ run_file_edac_name = joinpath("out",
 reference_data = JSON.parsefile(reference_file_edac_name)
 run_data = JSON.parsefile(run_file_edac_name)
 
-error_edac_P1 = interpolated_mse(reference_data["pressure_P1_fluid_1"]["time"],
-                                 reference_data["pressure_P1_fluid_1"]["values"],
-                                 run_data["pressure_P1_fluid_1"]["time"],
-                                 run_data["pressure_P1_fluid_1"]["values"])
+error_edac_P1 = interpolated_mse(reference_data["interpolated_pressure_P1_fluid_1"]["time"],
+                                 reference_data["interpolated_pressure_P1_fluid_1"]["values"],
+                                 run_data["interpolated_pressure_P1_fluid_1"]["time"],
+                                 run_data["interpolated_pressure_P1_fluid_1"]["values"])
 
-error_edac_P2 = interpolated_mse(reference_data["pressure_P2_fluid_1"]["time"],
-                                 reference_data["pressure_P2_fluid_1"]["values"],
-                                 run_data["pressure_P2_fluid_1"]["time"],
-                                 run_data["pressure_P2_fluid_1"]["values"])
+error_edac_P2 = interpolated_mse(reference_data["interpolated_pressure_P2_fluid_1"]["time"],
+                                 reference_data["interpolated_pressure_P2_fluid_1"]["values"],
+                                 run_data["interpolated_pressure_P2_fluid_1"]["time"],
+                                 run_data["interpolated_pressure_P2_fluid_1"]["values"])
 
 # WCSPH simulation
 ############################################################################################
-method = "wcsph"
-postprocessing_cb = PostprocessCallback(; dt=0.02, output_directory="out",
-                                        filename="validation_result_dam_break_" *
-                                                 method * "_" * formatted_string,
-                                        write_csv=false, max_x_coord, pressure_P1,
-                                        pressure_P2, pressure_P3)
-
-trixi_include(@__MODULE__, joinpath(examples_dir(), "fluid", "dam_break_2d.jl"),
-              fluid_particle_spacing=particle_spacing,
-              smoothing_length=smoothing_length, smoothing_kernel=smoothing_kernel,
-              boundary_density_calculator=boundary_density_calculator,
-              boundary_layers=4,
-              solution_prefix="validation_" * method * "_" * formatted_string,
-              extra_callback=postprocessing_cb, tspan=tspan,
-              update_strategy=SerialUpdate()) # To get the same results with different thread numbers
+trixi_include(@__MODULE__,
+              joinpath(validation_dir(), "dam_break_2d",
+                       "setup_marrone_2011.jl"), use_edac=false,
+              particles_per_height=resolution)
 
 reference_file_wcsph_name = joinpath(validation_dir(), "dam_break_2d",
                                      "validation_reference_wcsph_$formatted_string.json")
@@ -158,12 +60,15 @@ run_file_wcsph_name = joinpath("out",
 reference_data = JSON.parsefile(reference_file_wcsph_name)
 run_data = JSON.parsefile(run_file_wcsph_name)
 
-error_wcsph_P1 = interpolated_mse(reference_data["pressure_P1_fluid_1"]["time"],
-                                  reference_data["pressure_P1_fluid_1"]["values"],
-                                  run_data["pressure_P1_fluid_1"]["time"],
-                                  run_data["pressure_P1_fluid_1"]["values"])
+error_wcsph_P1 = interpolated_mse(reference_data["interpolated_pressure_P1_fluid_1"]["time"],
+                                  reference_data["interpolated_pressure_P1_fluid_1"]["values"],
+                                  run_data["interpolated_pressure_P1_fluid_1"]["time"],
+                                  run_data["interpolated_pressure_P1_fluid_1"]["values"])
+
+error_wcsph_P2 = interpolated_mse(reference_data["interpolated_pressure_P2_fluid_1"]["time"],
+                                  reference_data["interpolated_pressure_P2_fluid_1"]["values"],
+                                  run_data["interpolated_pressure_P2_fluid_1"]["time"],
+                                  run_data["interpolated_pressure_P2_fluid_1"]["values"])
 
-error_wcsph_P2 = interpolated_mse(reference_data["pressure_P2_fluid_1"]["time"],
-                                  reference_data["pressure_P2_fluid_1"]["values"],
-                                  run_data["pressure_P2_fluid_1"]["time"],
-                                  run_data["pressure_P2_fluid_1"]["values"])
+print(error_edac_P1, " ", error_edac_P2, " ",
+      error_wcsph_P1, " ", error_wcsph_P2, "\n")
diff --git a/validation/dam_break_2d/validation_reference_edac_0001875.json b/validation/dam_break_2d/validation_reference_edac_0001875.json
index 4c5569be9b..ac9fd34d0e 100644
--- a/validation/dam_break_2d/validation_reference_edac_0001875.json
+++ b/validation/dam_break_2d/validation_reference_edac_0001875.json
@@ -1,5 +1,5 @@
 {
-    "pressure_P1_fluid_1": {
+    "particle_pressure_P1_boundary_1": {
         "n_values": 100,
         "time": [
             0.0,
@@ -103,7 +103,7 @@
             1.96,
             1.9784774673179917
         ],
-        "system_name": "fluid",
+        "system_name": "boundary",
         "values": [
             0.0,
             0.0,
@@ -135,86 +135,81 @@
             0.0,
             0.0,
             0.0,
-            0.0,
-            38.85734483559844,
-            20.34519357862309,
-            117.82063328226991,
-            389.718239607207,
-            769.8654070431243,
-            1076.7518758914478,
-            1026.2544108321476,
-            1327.287574260001,
-            1227.5607892447892,
-            1253.3187882969128,
-            1511.794321392594,
-            1354.377583344614,
-            1354.3133526861,
-            1804.9365002461957,
-            1953.2421460372723,
-            2017.976107154098,
-            1962.329975384125,
-            1979.5430513093265,
-            2230.9174437541083,
-            2419.813149497851,
-            2403.889902263623,
-            2397.7018030632566,
-            2534.5612797009817,
-            2551.820672872391,
-            2532.8481610661947,
-            2749.346070882085,
-            2616.84442622009,
-            2792.1374647324456,
-            2714.134078988684,
-            2748.3391473114134,
-            2783.1023835032497,
-            2655.9523314600106,
-            2737.734564742591,
-            2765.8278987915196,
-            2668.1517634859615,
-            2758.4516976288646,
-            2847.9341776505744,
-            2775.905909179316,
-            2693.3746625120625,
-            2851.080172615903,
-            2864.676257164359,
-            2964.7394028901017,
-            3046.4719327454204,
-            3119.9509768316107,
-            3123.4699035088684,
-            3622.9044296391644,
-            3714.0567831856765,
-            4214.002431052554,
-            4510.78246257207,
-            6179.1005147003325,
-            7064.354777806273,
-            6508.752012659153,
-            5707.282614791367,
-            5246.883337350113,
-            5364.88038128409,
-            6082.482856160599,
-            3803.9436919502054,
-            3156.89881371551,
-            1507.2916348109213,
-            54.536661651502314,
-            7248.241323464671,
-            1214.9839618353303,
-            1482.290969228071,
-            2446.4382497287725,
-            3382.846667243814,
-            939.7591125245044,
-            24.150627047305562,
-            20.494352959282672,
-            25.701026204282403
+            2.2981182863156246,
+            111.35148057144342,
+            850.3816375062949,
+            1664.1302337595173,
+            2772.4216427969277,
+            3180.7591199100957,
+            3403.0902982140638,
+            3196.8608334159508,
+            3099.939672161992,
+            3087.827305980581,
+            3001.5341051098408,
+            3117.786196162167,
+            3115.6524239589867,
+            3149.0794078032036,
+            3176.964767688596,
+            3285.6990772987006,
+            3370.51037004366,
+            3398.090690851477,
+            3462.2452076982686,
+            3426.5578148209224,
+            3496.2772148459444,
+            3557.2121370005475,
+            3581.9220648946616,
+            3571.5581300014346,
+            3621.5997500697117,
+            3606.3052196734384,
+            3632.444122217405,
+            3607.2499578167767,
+            3573.0773825820384,
+            3550.875192096659,
+            3528.5316992809417,
+            3547.1712636528596,
+            3516.259716536333,
+            3474.5987607334423,
+            3481.1867925549664,
+            3423.7766140206936,
+            3424.654679172297,
+            3394.441302364672,
+            3412.318255877355,
+            3319.0410754344266,
+            3365.584929671564,
+            3356.8520436786725,
+            3383.2857043428435,
+            3389.949144491477,
+            3430.646956675188,
+            3510.4539053346775,
+            3521.781688167996,
+            3685.077496923565,
+            4372.213010682623,
+            5189.4400431277,
+            7458.3244483107665,
+            6302.600494052528,
+            5872.524081874461,
+            5629.108113216486,
+            5460.33428307572,
+            5402.752893363418,
+            5101.6012939625925,
+            5712.650727134408,
+            1979.3528532927205,
+            9156.553761915331,
+            2250.0698585674977,
+            2035.7499542874427,
+            996.96289568366,
+            1155.5179581583832,
+            2999.1417773042463,
+            1075.8040708353387,
+            219.7789771256124,
+            8.416104001764033,
+            30.892868165294132,
+            598.5646386565387
         ],
         "datatype": "Float64",
         "type": "series"
     },
-    "meta": {
-        "julia_version": "1.11.5",
-        "solver_version": "v0.2.7-30-g7844f9bfa-dirty",
-        "solver_name": "TrixiParticles.jl"
-    },
-    "pressure_P2_fluid_1": {
+    "interpolated_pressure_P3_fluid_1": {
         "n_values": 100,
         "time": [
             0.0,
@@ -355,52 +350,52 @@
             0.0,
             0.0,
             0.0,
-            19.173546528747554,
-            27.20845301941494,
-            21.219275368539897,
-            30.31626737898431,
-            33.73205349916507,
-            25.595814479124453,
-            12.498986462301346,
-            26.444164795457773,
-            12.51776295842259,
-            14.380589732896178,
-            17.782120001633913,
-            23.9436889596365,
-            13.17052129233745,
-            25.82876768883718,
-            94.78252436913439,
-            80.65496666953209,
-            175.03964094872316,
-            163.41672192053025,
-            209.8159094500567,
-            291.93495914981406,
-            314.3536444998607,
-            382.4639489175789,
-            485.9961465924742,
-            580.6612760799353,
-            671.543897814515,
-            753.3686411776682,
-            823.053746469195,
-            935.5060382332456,
-            1085.5900969004551,
-            1199.988074930769,
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diff --git a/validation/dam_break_2d/validation_reference_edac_00075.json b/validation/dam_break_2d/validation_reference_edac_00075.json
index 1ff2614ddc..b35f6d30f3 100644
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diff --git a/validation/dam_break_2d/validation_reference_edac_0015.json b/validation/dam_break_2d/validation_reference_edac_0015.json
index 8527b76baf..fd34df666f 100644
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diff --git a/validation/dam_break_2d/validation_reference_wcsph_0015.json b/validation/dam_break_2d/validation_reference_wcsph_0015.json
index c5adb19cc6..47de2d39cb 100644
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