[cctv]

Hi:
In meshrefinementdict there are
dynamicRefineFvMeshCoeffs
{
refineInterval 1;
field alpha1;
lowerRefineLevel 0.001;
upperRefineLevel 0.999;
unrefineLevel 10;
nBufferLayers 1;
maxRefinement 2;
maxCells 200000;
correctFluxes
(
(
phi
U
)
);
dumpLevel true;
}

I am not sure if a cell would slit when the value lower than the lowerRefineLevel or larger than it.
In addition, I am wondering what the exat use of unrefineLevel. Does it means cells would unrefine when the value is larger or smaller than unrefineLevel?
Thank you for your help
Yu

[nero235]

Originally Posted by cctv

Hi:
In meshrefinementdict there are
dynamicRefineFvMeshCoeffs
{
refineInterval 1;
field alpha1;
lowerRefineLevel 0.001;
upperRefineLevel 0.999;
unrefineLevel 10;
nBufferLayers 1;
maxRefinement 2;
maxCells 200000;
correctFluxes
(
(
phi
U
)
);
dumpLevel true;
}

I am not sure if a cell would slit when the value lower than the lowerRefineLevel or larger than it.
In addition, I am wondering what the exat use of unrefineLevel. Does it means cells would unrefine when the value is larger or smaller than unrefineLevel?
Thank you for your help
Yu

The cell will be refined if the current value is in between the lower and upper bound. If the value is smaller than the unrefine value, the cells will be unrefined. When I looked in the constant/dynamicMeshDict of the interDyMFoam tutorial cases, these values where commented like this:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.2.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      dynamicMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dynamicFvMesh   dynamicRefineFvMesh;

dynamicRefineFvMeshCoeffs
{
    // How often to refine
    refineInterval  1;
    // Field to be refinement on
    field           alpha1;
    // Refine field inbetween lower..upper
    lowerRefineLevel 0.001;
    upperRefineLevel 0.999;
    // If value < unrefineLevel unrefine
    unrefineLevel   10;
    // Have slower than 2:1 refinement
    nBufferLayers   1;
    // Refine cells only up to maxRefinement levels
    maxRefinement   2;
    // Stop refinement if maxCells reached
    maxCells        200000;
    // Flux field and corresponding velocity field. Fluxes on changed
    // faces get recalculated by interpolating the velocity. Use 'none'
    // on surfaceScalarFields that do not need to be reinterpolated.
    correctFluxes
    (
        (phi Urel)
        (phiAbs U)
        (phiAbs_0 U_0)
        (nHatf none)
        (rho*phi none)
        (ghf none)
    );
    // Write the refinement level as a volScalarField
    dumpLevel       true;
}


// ************************************************************************* //

Regards, Sebastian