Simplifying fieldset creation (no U and V needed)

Author: erikvansebille

docs/user_guide/examples_v3/tutorial_interaction.ipynb

@@ -60,8 +60,7 @@
     "\n",
     "plt.rcParams[\"animation.html\"] = \"jshtml\"\n",
     "\n",
-    "import parcels\n",
-    "from parcels._datasets.structured.generated import simple_UV_dataset"
+    "import parcels"
    ]
   },
   {
@@ -121,15 +120,8 @@
    "outputs": [],
    "source": [
     "def DiffusionFieldSet():\n",
-    "    \"\"\"Define a fieldset without flow but with diffusion\"\"\"\n",
-    "    ds = simple_UV_dataset(dims=(1, 1, 1, 1), mesh=\"flat\")\n",
-    "    ds = ds.assign_coords(time=ds.time - ds.time[0])  # set time to timedelta\n",
-    "    ds[\"time\"].attrs.update({\"axis\": \"T\"})\n",
-    "    grid = parcels.XGrid.from_dataset(ds, mesh=\"flat\")\n",
-    "    U = parcels.Field(\"U\", ds[\"U\"], grid, interp_method=parcels.interpolators.XLinear)\n",
-    "    V = parcels.Field(\"V\", ds[\"V\"], grid, interp_method=parcels.interpolators.XLinear)\n",
-    "    UV = parcels.VectorField(\"UV\", U, V)\n",
-    "    fieldset = parcels.FieldSet([U, V, UV])\n",
+    "    \"\"\"Define a fieldset with only diffusion\"\"\"\n",
+    "    fieldset = parcels.FieldSet([])\n",
     "    fieldset.add_constant_field(\"Kh_zonal\", 0.0005, mesh=\"flat\")\n",
     "    fieldset.add_constant_field(\"Kh_meridional\", 0.0005, mesh=\"flat\")\n",
     "    return fieldset"