cellZoneMultiMaterialInterface

Description

This class applies a multi-material correction to the solution of the momentum balance equation in mechanicsSubSolver. Two sets of weights can be used to alter the correction: a defaultWeights for the correction on internal faces (within a cellZone) and a interfaceWeight for the interface faces, defined as the internal faces between two different cellZones.

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Options

The parameters for this class are to be set in the multiMaterialCorrection sub-dictionary within the mechanicsOptions subdictionary, which in turn is located within the solverDict.

Parameters in multiMaterialCorrection:

defaultWeights	Parameter of the multiMaterialCorrection subdictionary; defines the fraction of the full correction applied, between 1 and 0. Applying full correction in all directions for every cell may negatively impact convergence. We recommend setting defaultWeights between 0.9 and 1 for a good balance (1 if possible).
defaultWeightsGrad	Defines the fraction of the full correction applied to the gradient contribution in sigmaExp, ranging from 0 to 1. By default it is set equal to defaultWeights. Applying full correction in all directions for every cell may negatively impact convergence. We recommend setting defaultWeights between 0.9 and 1 for a good balance (1 if possible).
interfaceWeights	Parameter of the multiMaterialCorrection subdictionary, it defines the fraction of the full correction activated (1 to 0) at interfaces. It is typically safe to set this value to 1.0.

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Usage

Here is a code snippet of the solverDict to be used for activating the uniform multi-material correction:

// It is just an example, you can select any mechanicsSolver
mechanicsSolver smallStrain;

// Rest of the solverDict etc...

mechanicsOptions
{
    // Other options if needed

    // This is not necessary, as activating the multiMaterial correction
    // will make RhieChowCorrection false by default
    RhieChowCorrection false;    

    // The presence of this subdictionary activates the multiMaterial 
    // correction
    multiMaterialCorrection
    {
        type cellZone;

        defaultWeights 1.0;
        interfaceWeights 1.0;
    }
}

// Rest of the solverDict etc...