twoPhaseEulerFoam: Corrected potential conservation issue at inlet-outlet BCs

Updated MULES to ensure the limiter is 1 at inlet BCs

applications/solvers/multiphase/twoPhaseEulerFoam/alphaEqn.H

@@ -92,6 +92,12 @@
                 )
             );
 
+            alphaPhic1.boundaryField() = min
+            (
+                phi1.boundaryField()*alpha1.boundaryField(),
+                alphaPhic1.boundaryField()
+            );
+
             MULES::explicitSolve
             (
                 geometricOneField(),

src/finiteVolume/fvMatrices/solvers/MULES/MULESTemplates.C

@@ -485,11 +485,12 @@ void Foam::MULES::limiter
                 const labelList& pFaceCells =
                     mesh.boundary()[patchi].faceCells();
                 const scalarField& phiBDPf = phiBDBf[patchi];
+                const scalarField& phiCorrPf = phiCorrBf[patchi];
 
                 forAll(lambdaPf, pFacei)
                 {
                     // Limit outlet faces only
-                    if (phiBDPf[pFacei] > 0)
+                    if ((phiBDPf[pFacei] + phiCorrPf[pFacei]) > SMALL*SMALL)
                     {
                         label pfCelli = pFaceCells[pFacei];
 
@@ -862,7 +863,7 @@ void Foam::MULES::limiterCorr
                 forAll(lambdaPf, pFacei)
                 {
                     // Limit outlet faces only
-                    if (phiCorrPf[pFacei] > 0)
+                    if (phiCorrPf[pFacei] > SMALL*SMALL)
                     {
                         label pfCelli = pFaceCells[pFacei];
 

tutorials/multiphase/twoPhaseEulerFoam/laminar/fluidisedBed/0/U.particles

@@ -28,9 +28,8 @@ boundaryField
 
     outlet
     {
-        type               pressureInletOutletVelocity;
-        phi                phi.particles;
-        value              $internalField;
+        type               fixedValue;
+        value              uniform (0 0 0);
     }
 
     walls

tutorials/multiphase/twoPhaseEulerFoam/laminar/fluidisedBed/0/alpha.particles

@@ -6027,8 +6027,7 @@ boundaryField
 {
     inlet
     {
-        type            fixedValue;
-        value           uniform 0;
+        type            zeroGradient;
     }
     outlet
     {