removed unused argument

Author: RemDelaporteMathurin

src/festim/exports/vtx.py

@@ -212,6 +212,10 @@ class CustomField(ExportBaseClass):
     function: fem.Function
     writer: io.VTXWriter
     dolfinx_expression: fem.Expression
+    expression: Callable
+    species_dependent_value: dict[str, Species]
+    subdomain: VolumeSubdomain
+    checkpoint: bool
 
     def __init__(
         self,
@@ -235,9 +239,17 @@ def __init__(
     def set_dolfinx_expression(
         self,
         temperature: fem.Constant | fem.Function,
-        species: list,
         time: fem.Constant,
     ):
+        """
+        Set the dolfinx expression used to evaluate the custom field. This is done by
+        evaluating the user-provided expression with the appropriate arguments and using
+        the result to create a dolfinx expression.
+
+        Args:
+            temperature: The temperature field to use in the expression
+            time: The time to use in the expression
+        """
         # check
         arguments = inspect.signature(self.expression).parameters
         kwargs = {}

src/festim/hydrogen_transport_problem.py

@@ -453,7 +453,6 @@ def initialise_exports(self):
                     export.function = fem.Function(self.V_CG_1)
                     export.set_dolfinx_expression(
                         temperature=self.temperature_fenics,
-                        species=self.species,
                         time=self.t,
                     )
 
@@ -1695,7 +1694,6 @@ def initialise_exports(self):
                 export.function = fem.Function(V)
                 export.set_dolfinx_expression(
                     temperature=self.temperature_fenics,  # need to pass the right temperature
-                    species=self.species,
                     time=self.t,
                 )