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Is MULES the right choice for modified transport equation?

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Old   June 25, 2019, 05:05
Question Is MULES the right choice for modified transport equation?
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Elisabeth Diehl
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Hi everybody,
I want to solve the following modified transport equation for the calculation of sensitivities:

\frac{\partial}{\partial t} (\delta \alpha) + \nabla \cdot (\vec{u} \ \delta \alpha) + \nabla \cdot (\delta \vec{u} \ \alpha)

Within interFoam, I implemented the the following code right after solving alphaEqn.H (along with initial fields dAlpha and dU, calculation of dPhi and other modifications):

Code:
{
    word dAlphaScheme("div(phi,dAlpha)");
    word dPhiScheme("div(dPhi,alpha)");
    
    #include "alphaSuSp.H"
    
    surfaceScalarField dAlphaPhi
    (
    fvc::flux(phi, dAlpha, dAlphaScheme)
    + fvc::flux(dPhi, alpha1, dPhiScheme)
    );
    
    MULES::explicitSolve
    (
    geometricOneField(),
    dAlpha,
    dAlphaPhi,
    Sp,
    Su
    );
}
It works, but I'm not sure if MULES::explicitSolve is the right way to solve this equation. After a few time steps the solution smears heavily. What would you recommend?



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