From 314c9475ff7cc5f92e923a14a26437e64d438e6a Mon Sep 17 00:00:00 2001
From: Henry <Henry>
Date: Wed, 24 Oct 2012 17:25:23 +0100
Subject: [PATCH] twoLiquidMixingFoam: Converted to using MULES and sub-cycling
for alpha1
Operator-splitting is used for the diffusion
---
.../twoLiquidMixingFoam/alphaDiffusionEqn.H | 18 +++++++++++++
.../twoLiquidMixingFoam/alphaEqnSubCycle.H | 26 +++++++++++++++++++
2 files changed, 44 insertions(+)
create mode 100644 applications/solvers/multiphase/twoLiquidMixingFoam/alphaDiffusionEqn.H
create mode 100644 applications/solvers/multiphase/twoLiquidMixingFoam/alphaEqnSubCycle.H
diff --git a/applications/solvers/multiphase/twoLiquidMixingFoam/alphaDiffusionEqn.H b/applications/solvers/multiphase/twoLiquidMixingFoam/alphaDiffusionEqn.H
new file mode 100644
index 00000000000..139646e43c6
--- /dev/null
+++ b/applications/solvers/multiphase/twoLiquidMixingFoam/alphaDiffusionEqn.H
@@ -0,0 +1,18 @@
+{
+ fvScalarMatrix alpha1Eqn
+ (
+ fvm::ddt(alpha1)
+ - fvc::ddt(alpha1)
+ - fvm::laplacian
+ (
+ volScalarField("Dab", Dab + alphatab*turbulence->nut()),
+ alpha1
+ )
+ );
+
+ alpha1Eqn.solve();
+
+ rhoPhi += alpha1Eqn.flux()*(rho1 - rho2);
+}
+
+rho = alpha1*rho1 + (scalar(1) - alpha1)*rho2;
diff --git a/applications/solvers/multiphase/twoLiquidMixingFoam/alphaEqnSubCycle.H b/applications/solvers/multiphase/twoLiquidMixingFoam/alphaEqnSubCycle.H
new file mode 100644
index 00000000000..6c82f940499
--- /dev/null
+++ b/applications/solvers/multiphase/twoLiquidMixingFoam/alphaEqnSubCycle.H
@@ -0,0 +1,26 @@
+label nAlphaCorr(readLabel(pimple.dict().lookup("nAlphaCorr")));
+label nAlphaSubCycles(readLabel(pimple.dict().lookup("nAlphaSubCycles")));
+
+if (nAlphaSubCycles > 1)
+{
+ dimensionedScalar totalDeltaT = runTime.deltaT();
+ surfaceScalarField rhoPhiSum(0.0*rhoPhi);
+
+ for
+ (
+ subCycle<volScalarField> alphaSubCycle(alpha1, nAlphaSubCycles);
+ !(++alphaSubCycle).end();
+ )
+ {
+ #include "alphaEqn.H"
+ rhoPhiSum += (runTime.deltaT()/totalDeltaT)*rhoPhi;
+ }
+
+ rhoPhi = rhoPhiSum;
+}
+else
+{
+ #include "alphaEqn.H"
+}
+
+rho == alpha1*rho1 + (scalar(1) - alpha1)*rho2;
--
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