44 lines
1.1 KiB
C++
44 lines
1.1 KiB
C++
if(divSigmaExpMethod == "standard")
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{
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divSigmaExp = fvc::div
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(
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mu*gradU.T() + lambda*(I*tr(gradU)) - (mu + lambda)*gradU,
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"div(sigma)"
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);
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}
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else if(divSigmaExpMethod == "surface")
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{
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divSigmaExp = fvc::div
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(
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muf*(mesh.Sf() & fvc::interpolate(gradU.T()))
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+ lambdaf*(mesh.Sf() & I*fvc::interpolate(tr(gradU)))
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- (muf + lambdaf)*(mesh.Sf() & fvc::interpolate(gradU))
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);
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}
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else if(divSigmaExpMethod == "decompose")
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{
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snGradU = fvc::snGrad(U);
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surfaceTensorField shearGradU = ((I - n*n) & fvc::interpolate(gradU));
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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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- (muf + lambdaf)*(snGradU & (I - n*n))
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+ lambdaf*tr(shearGradU & (I - n*n))*n
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+ muf*(shearGradU&n)
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)
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);
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}
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else if(divSigmaExpMethod == "expLaplacian")
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{
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divSigmaExp =
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- fvc::laplacian(mu + lambda, U, "laplacian(DU,U)")
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+ fvc::div(mu*gradU.T() + lambda*(I*tr(gradU)), "div(sigma)");
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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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