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ENH: Changes in handling topological changes in VOF solvers

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1) Using divU instead of fvc::absolute(phi,U) in TEqn as the latter uses latest time meshPhi which is inconsistent
2) Adding fvc::interpolate(U) when topo changes
3) in pEq for compressible dgdt is updated using the latest rho1 and rho2 after compressible effects are considered
This commit is contained in:
sergio
2016-12-07 12:57:32 -08:00
parent 05df4c71b6
commit 11479c51d7
6 changed files with 98 additions and 60 deletions
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6
applications/solvers/multiphase/compressibleInterFoam/TEqn.H
View File

@ -5,8 +5,8 @@
+ fvm::div(rhoPhi, T)
- fvm::laplacian(mixture.alphaEff(turbulence->mut()), T)
+ (
fvc::div(fvc::absolute(phi, U), p)
+ fvc::ddt(rho, K) + fvc::div(rhoPhi, K)
divU*p
+ fvc::ddt(rho, K) + fvc::div(rhoPhi, K)
)
*(
alpha1/mixture.thermo1().Cv()
@ -20,4 +20,4 @@
mixture.correct();
Info<< "min(T) " << min(T).value() << endl;
}
}

104
applications/solvers/multiphase/compressibleInterFoam/compressibleInterDyMFoam/compressibleInterDyMFoam.C
View File

@ -70,6 +70,21 @@ int main(int argc, char *argv[])
turbulence->validate();
volScalarField rAU
(
IOobject
(
"rAU",
runTime.timeName(),
mesh,
IOobject::READ_IF_PRESENT,
IOobject::AUTO_WRITE
),
mesh,
dimensionedScalar("rAU", dimTime/rho.dimensions(), 1.0)
);
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Info<< "\nStarting time loop\n" << endl;
@ -77,45 +92,17 @@ int main(int argc, char *argv[])
{
#include "readControls.H"
{
// Store divU from the previous mesh so that it can be mapped
// and used in correctPhi to ensure the corrected phi has the
// same divergence
volScalarField divU("divU0", fvc::div(fvc::absolute(phi, U)));
// Store divU from the previous mesh so that it can be mapped
// and used in correctPhi to ensure the corrected phi has the
// same divergence
volScalarField divU("divU0",fvc::div(fvc::absolute(phi, U)));
#include "CourantNo.H"
#include "setDeltaT.H"
#include "CourantNo.H"
#include "setDeltaT.H"
runTime++;
runTime++;
Info<< "Time = " << runTime.timeName() << nl << endl;
scalar timeBeforeMeshUpdate = runTime.elapsedCpuTime();
// Do any mesh changes
mesh.update();
if (mesh.changing())
{
Info<< "Execution time for mesh.update() = "
<< runTime.elapsedCpuTime() - timeBeforeMeshUpdate
<< " s" << endl;
gh = (g & mesh.C()) - ghRef;
ghf = (g & mesh.Cf()) - ghRef;
}
if (mesh.changing() && correctPhi)
{
// Calculate absolute flux from the mapped surface velocity
phi = mesh.Sf() & Uf;
#include "correctPhi.H"
// Make the fluxes relative to the mesh motion
fvc::makeRelative(phi, U);
}
}
Info<< "Time = " << runTime.timeName() << nl << endl;
if (mesh.changing() && checkMeshCourantNo)
{
@ -127,6 +114,46 @@ int main(int argc, char *argv[])
// --- Pressure-velocity PIMPLE corrector loop
while (pimple.loop())
{
if (pimple.firstIter())
{
scalar timeBeforeMeshUpdate = runTime.elapsedCpuTime();
mesh.update();
if (mesh.changing())
{
Info<< "Execution time for mesh.update() = "
<< runTime.elapsedCpuTime() - timeBeforeMeshUpdate
<< " s" << endl;
gh = (g & mesh.C()) - ghRef;
ghf = (g & mesh.Cf()) - ghRef;
}
if ((correctPhi && mesh.changing()) || mesh.topoChanging())
{
// Calculate absolute flux from the mapped surface velocity
// SAF: temporary fix until mapped Uf is assessed
Uf = fvc::interpolate(U);
phi = mesh.Sf() & Uf;
#include "correctPhi.H"
fvc::makeRelative(phi, U);
mixture.correct();
mesh.topoChanging(false);
}
if (mesh.changing() && checkMeshCourantNo)
{
#include "meshCourantNo.H"
}
}
#include "alphaEqnsSubCycle.H"
// correct interface on first PIMPLE corrector
@ -145,6 +172,11 @@ int main(int argc, char *argv[])
{
#include "pEqn.H"
}
if (pimple.turbCorr())
{
turbulence->correct();
}
}
rho = alpha1*rho1 + alpha2*rho2;

20
applications/solvers/multiphase/compressibleInterFoam/compressibleInterDyMFoam/pEqn.H
View File

@ -87,15 +87,6 @@
if (pimple.finalNonOrthogonalIter())
{
p = max(p_rgh + (alpha1*rho1 + alpha2*rho2)*gh, pMin);
p_rgh = p - (alpha1*rho1 + alpha2*rho2)*gh;
dgdt =
(
pos(alpha2)*(p_rghEqnComp2 & p_rgh)/rho2
- pos(alpha1)*(p_rghEqnComp1 & p_rgh)/rho1
);
phi = phiHbyA + p_rghEqnIncomp.flux();
U = HbyA
@ -116,8 +107,19 @@
rho = alpha1*rho1 + alpha2*rho2;
p = max(p_rgh + rho*gh, pMin);
p_rgh = p - rho*gh;
dgdt =
(
pos(alpha2)*(p_rghEqnComp2 & p_rgh)/rho2
- pos(alpha1)*(p_rghEqnComp1 & p_rgh)/rho1
);
K = 0.5*magSqr(U);
Info<< "max(U) " << max(mag(U)).value() << endl;
Info<< "min(p_rgh) " << min(p_rgh).value() << endl;
}

1
applications/solvers/multiphase/compressibleInterFoam/compressibleInterFoam.C
View File

@ -93,6 +93,7 @@ int main(int argc, char *argv[])
solve(fvm::ddt(rho) + fvc::div(rhoPhi));
#include "UEqn.H"
volScalarField divU(fvc::div(fvc::absolute(phi, U)));
#include "TEqn.H"
// --- Pressure corrector loop

20
applications/solvers/multiphase/compressibleInterFoam/pEqn.H
View File

@ -84,15 +84,6 @@
if (pimple.finalNonOrthogonalIter())
{
p = max(p_rgh + (alpha1*rho1 + alpha2*rho2)*gh, pMin);
p_rgh = p - (alpha1*rho1 + alpha2*rho2)*gh;
dgdt =
(
pos(alpha2)*(p_rghEqnComp2 & p_rgh)/rho2
- pos(alpha1)*(p_rghEqnComp1 & p_rgh)/rho1
);
phi = phiHbyA + p_rghEqnIncomp.flux();
U = HbyA
@ -101,14 +92,21 @@
}
}
// p = max(p_rgh + (alpha1*rho1 + alpha2*rho2)*gh, pMin);
// Update densities from change in p_rgh
rho1 += psi1*(p_rgh - p_rgh_0);
rho2 += psi2*(p_rgh - p_rgh_0);
rho = alpha1*rho1 + alpha2*rho2;
p = max(p_rgh + rho*gh, pMin);
p_rgh = p - rho*gh;
dgdt =
(
pos(alpha2)*(p_rghEqnComp2 & p_rgh)/rho2
- pos(alpha1)*(p_rghEqnComp1 & p_rgh)/rho1
);
K = 0.5*magSqr(U);
Info<< "max(U) " << max(mag(U)).value() << endl;

7
applications/solvers/multiphase/interFoam/interDyMFoam/interDyMFoam.C
View File

@ -133,9 +133,12 @@ int main(int argc, char *argv[])
ghf = (g & mesh.Cf()) - ghRef;
}
if (mesh.changing() && correctPhi)
if ((mesh.changing() && correctPhi) || mesh.topoChanging())
{
// Calculate absolute flux from the mapped surface velocity
// SAF: temporary fix until mapped Uf is assessed
Uf = fvc::interpolate(U);
phi = mesh.Sf() & Uf;
#include "correctPhi.H"
@ -144,6 +147,8 @@ int main(int argc, char *argv[])
fvc::makeRelative(phi, U);
mixture.correct();
mesh.topoChanging(false);
}
if (mesh.changing() && checkMeshCourantNo)