interDyMFoam: delete alphaPhiCorr0 if the mesh changes

The previous time-step compression flux is not valid/accurate on the new mesh
and it is better to re-calculate it rather than map it from the previous mesh to
the new mesh.

applications/solvers/multiphase/interFoam/alphaEqn.H

@@ -182,6 +182,11 @@
     if (alphaApplyPrevCorr && MULESCorr)
     {
         talphaPhiCorr0 = alphaPhi - talphaPhiCorr0;
+        talphaPhiCorr0.ref().rename("alphaPhiCorr0");
+    }
+    else
+    {
+        talphaPhiCorr0.clear();
     }
 
     if

applications/solvers/multiphase/interFoam/interDyMFoam/interDyMFoam.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2011-2016 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -125,6 +125,9 @@ int main(int argc, char *argv[])
                         << runTime.elapsedCpuTime() - timeBeforeMeshUpdate
                         << " s" << endl;
 
+                    // Do not apply previous time-step mesh compression flux
+                    talphaPhiCorr0.clear();
+
                     gh = (g & mesh.C()) - ghRef;
                     ghf = (g & mesh.Cf()) - ghRef;
                 }