1cacdf0d89
This is an experimental feature demonstrating the potential of MULES to
create bounded solution which are 2nd-order in time AND space.
Crank-Nicolson may be selected on U and/or alpha but will only be fully
2nd-order if used on both within the PIMPLE-loop to converge the
interaction between the flux and phase-fraction. Note also that
Crank-Nicolson may not be used with sub-cycling but all the features of
semi-implicit MULES are available in particular MULESCorr and
alphaApplyPrevCorr.
Examples of ddt specification:
ddtSchemes
{
default Euler;
}
ddtSchemes
{
default CrankNicolson 0.9;
}
ddtSchemes
{
default none;
ddt(alpha) CrankNicolson 0.9;
ddt(rho,U) CrankNicolson 0.9;
}
ddtSchemes
{
default none;
ddt(alpha) Euler;
ddt(rho,U) CrankNicolson 0.9;
}
ddtSchemes
{
default none;
ddt(alpha) CrankNicolson 0.9;
ddt(rho,U) Euler;
}
In these examples a small amount of off-centering in used to stabilize
the Crank-Nicolson scheme. Also the specification for alpha1 is via the
generic phase-fraction name to ensure in multiphase solvers (when
Crank-Nicolson support is added) the scheme is identical for all phase
fractions.
This development is back-ported from OpenFOAM-dev:
f78d33b634
139 lines
2.8 KiB
C
139 lines
2.8 KiB
C
Info<< "Reading field p_rgh\n" << endl;
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volScalarField p_rgh
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(
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IOobject
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(
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"p_rgh",
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runTime.timeName(),
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mesh,
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IOobject::MUST_READ,
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IOobject::AUTO_WRITE
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),
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mesh
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);
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Info<< "Reading field U\n" << endl;
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volVectorField U
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(
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IOobject
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(
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"U",
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runTime.timeName(),
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mesh,
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IOobject::MUST_READ,
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IOobject::AUTO_WRITE
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),
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mesh
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);
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#include "createPhi.H"
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Info<< "Reading transportProperties\n" << endl;
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immiscibleIncompressibleTwoPhaseMixture mixture(U, phi);
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volScalarField& alpha1(mixture.alpha1());
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volScalarField& alpha2(mixture.alpha2());
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const dimensionedScalar& rho1 = mixture.rho1();
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const dimensionedScalar& rho2 = mixture.rho2();
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// Need to store rho for ddt(rho, U)
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volScalarField rho
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(
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IOobject
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(
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"rho",
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runTime.timeName(),
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mesh,
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IOobject::READ_IF_PRESENT
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),
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alpha1*rho1 + alpha2*rho2,
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alpha1.boundaryField().types()
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);
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rho.oldTime();
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// Mass flux
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surfaceScalarField rhoPhi
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(
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IOobject
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(
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"rhoPhi",
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runTime.timeName(),
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mesh,
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IOobject::NO_READ,
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IOobject::NO_WRITE
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),
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fvc::interpolate(rho)*phi
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);
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// Construct incompressible turbulence model
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autoPtr<incompressible::turbulenceModel> turbulence
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(
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incompressible::turbulenceModel::New(U, phi, mixture)
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);
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#include "readGravitationalAcceleration.H"
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Info<< "Calculating field g.h\n" << endl;
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volScalarField gh("gh", g & mesh.C());
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surfaceScalarField ghf("ghf", g & mesh.Cf());
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volScalarField p
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(
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IOobject
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(
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"p",
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runTime.timeName(),
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mesh,
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IOobject::NO_READ,
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IOobject::AUTO_WRITE
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),
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p_rgh + rho*gh
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);
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label pRefCell = 0;
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scalar pRefValue = 0.0;
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setRefCell
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(
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p,
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p_rgh,
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pimple.dict(),
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pRefCell,
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pRefValue
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);
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if (p_rgh.needReference())
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{
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p += dimensionedScalar
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(
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"p",
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p.dimensions(),
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pRefValue - getRefCellValue(p, pRefCell)
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);
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p_rgh = p - rho*gh;
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}
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fv::IOoptionList fvOptions(mesh);
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// MULES flux from previous time-step
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surfaceScalarField phiAlpha
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(
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IOobject
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(
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"phiAlpha",
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runTime.timeName(),
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mesh,
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IOobject::READ_IF_PRESENT,
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IOobject::AUTO_WRITE
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),
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phi*fvc::interpolate(alpha1)
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);
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// MULES Correction
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tmp<surfaceScalarField> tphiAlphaCorr0;
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