55 lines
1.4 KiB
C++
55 lines
1.4 KiB
C++
if(divDSigmaExpMethod == "standard")
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{
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divDSigmaExp = fvc::div
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(
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mu*gradDU.T() + lambda*(I*tr(gradDU)) - (mu + lambda)*gradDU,
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"div(sigma)"
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);
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}
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else if(divDSigmaExpMethod == "surface")
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{
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surfaceTensorField gradDUf = fvc::interpolate(gradDU);
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divDSigmaExp = fvc::div
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(
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mesh.magSf()*
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(
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muf*(n & gradDUf.T())
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+ lambdaf*tr(gradDUf)*n
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- (muf + lambdaf)*(n & gradDUf)
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)
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);
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// divDSigmaExp = fvc::div
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// (
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// muf*(mesh.Sf() & fvc::interpolate(gradDU.T()))
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// + lambdaf*(mesh.Sf() & I*fvc::interpolate(tr(gradDU)))
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// - (muf + lambdaf)*(mesh.Sf() & fvc::interpolate(gradDU))
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// );
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}
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else if(divDSigmaExpMethod == "decompose")
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{
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surfaceTensorField shearGradDU = ((I - n*n) & fvc::interpolate(gradDU));
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divDSigmaExp = fvc::div
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(
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mesh.magSf()*
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(
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- (muf + lambdaf)*(fvc::snGrad(DU) & (I - n*n))
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+ lambdaf*tr(shearGradDU & (I - n*n))*n
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+ muf*(shearGradDU & n)
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)
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);
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}
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else if(divDSigmaExpMethod == "laplacian")
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{
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divDSigmaExp =
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- fvc::laplacian(mu + lambda, DU, "laplacian(DDU,DU)")
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+ fvc::div(mu*gradDU.T() + lambda*(I*tr(gradDU)), "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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<< "divDSigmaExp method " << divDSigmaExpMethod << " not found!"
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<< abort(FatalError);
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}
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