29 lines
840 B
C++
29 lines
840 B
C++
if(divSigmaExpMethod == "standard")
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{
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//- calculating the full gradient has good convergence and no high freq oscillations
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divSigmaExp = fvc::div((C && symm(gradU)) - (K & gradU), "div(sigma)");
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}
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else if(divSigmaExpMethod == "surface")
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{
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//- this form seems to have the best convergence
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divSigmaExp = fvc::div
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(
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mesh.magSf()*
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(
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(n & (Cf && fvc::interpolate(symm(gradU))))
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- (n & (Kf & fvc::interpolate(gradU)))
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)
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);
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}
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else if(divSigmaExpMethod == "laplacian")
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{
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//- can cause high freq oscillations and slow convergence
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divSigmaExp =
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fvc::div(C && symm(epsilon), "div(sigma)")
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- fvc::laplacian(K, U, "laplacian(K, U)");
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}
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else
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{
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FatalErrorIn(args.executable())
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<< "divSigmaExp method " << divSigmaExpMethod << " not found!" << endl;
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}
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