[exercise-coupling-ff-pm]{turbulence] Improve calculation of velocity gradient for BJS walls

exercises/exercise-coupling-ff-pm/turbulence/ex_turbulence_coupling_ff-pm.cc

@@ -165,9 +165,6 @@ int main(int argc, char** argv) try
     sol[stokesCellCenterIdx] = stokesSol[stokesCellCenterIdx];
     sol[stokesFaceIdx] = stokesSol[stokesFaceIdx];
 
-    // TODO: update static wall properties
-    // TODO: update dynamic wall properties
-
     darcyProblem->applyInitialSolution(sol[darcyIdx]);
     auto solDarcyOld = sol[darcyIdx];
 
@@ -175,6 +172,9 @@ int main(int argc, char** argv) try
 
     couplingManager->init(stokesProblem, darcyProblem, sol);
 
+    // TODO: update static wall properties
+    // TODO: update dynamic wall properties
+
     // the grid variables
     using StokesGridVariables = typename GET_PROP_TYPE(StokesTypeTag, GridVariables);
     auto stokesGridVariables = std::make_shared<StokesGridVariables>(stokesProblem, stokesFvGridGeometry);

exercises/exercise-coupling-ff-pm/turbulence/ex_turbulence_ffproblem.hh

@@ -307,7 +307,7 @@ public:
      */
     Scalar permeability(const SubControlVolumeFace& scvf) const
     {
-        return couplingManager().couplingData().darcyPermeability(scvf);
+        return couplingManager().problem(CouplingManager::darcyIdx).spatialParams().permeabilityAtPos(scvf.center());
     }
 
     /*!

exercises/solution/exercise-coupling-ff-pm/turbulence/ex_turbulence_coupling_ff-pm.cc

@@ -164,12 +164,6 @@ int main(int argc, char** argv) try
     auto solStokesOld = stokesSol;
     sol[stokesCellCenterIdx] = stokesSol[stokesCellCenterIdx];
     sol[stokesFaceIdx] = stokesSol[stokesFaceIdx];
-    // TODO: update static wall properties
-    // TODO: update dynamic wall properties
-#if EXNUMBER >= 1
-    stokesProblem->updateStaticWallProperties();
-    stokesProblem->updateDynamicWallProperties(stokesSol);
-#endif
 
     darcyProblem->applyInitialSolution(sol[darcyIdx]);
     auto solDarcyOld = sol[darcyIdx];
@@ -177,6 +171,12 @@ int main(int argc, char** argv) try
     auto solOld = sol;
 
     couplingManager->init(stokesProblem, darcyProblem, sol);
+    // TODO: update static wall properties
+    // TODO: update dynamic wall properties
+#if EXNUMBER >= 1
+    stokesProblem->updateStaticWallProperties();
+    stokesProblem->updateDynamicWallProperties(stokesSol);
+#endif
 
     // the grid variables
     using StokesGridVariables = typename GET_PROP_TYPE(StokesTypeTag, GridVariables);

exercises/solution/exercise-coupling-ff-pm/turbulence/ex_turbulence_ffproblem.hh

@@ -338,7 +338,7 @@ public:
      */
     Scalar permeability(const SubControlVolumeFace& scvf) const
     {
-        return couplingManager().couplingData().darcyPermeability(scvf);
+        return couplingManager().problem(CouplingManager::darcyIdx).spatialParams().permeabilityAtPos(scvf.center());
     }
 
     /*!