Introduced changes required to make isoAdvector and interIsoFoam work with morphing meshes: 1) In the alphaEqn.H U is made relative to mesh motion before the interface advection step, 2) in isoAdvection::advect() alpha must be multiplied by Vsc0()/Vsc(). Implementation tested and verified with 1) a spherical interface in a cubic domain with no flow, where the domain walls are squeezed together and 2) a spherical interfacee inside the sloshingCylinder, again with no flow, so the sphere should stay spherical, which it does.

applications/solvers/multiphase/interIsoFoam/alphaEqn.H

@@ -1,6 +1,19 @@
 {
+    // Temporarily making U relative to mesh motion
+    if (mesh.moving())
+    {
+        U -= fvc::reconstruct(mesh.phi());
+    }
+
     // Updating alpha1
     advector.advect();
+
+    // Making U absolute again after advection step
+    if (mesh.moving())
+    {
+        U += fvc::reconstruct(mesh.phi());
+    }
+
     #include "rhofs.H"
     rhoPhi = advector.getRhoPhi(rho1f, rho2f);