44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
if (divSigmaExpMethod == "standard")
|
|
{
|
|
divSigmaExp = fvc::div
|
|
(
|
|
mu*gradU.T() + lambda*(I*tr(gradU)) - (mu + lambda)*gradU,
|
|
"div(sigma)"
|
|
);
|
|
}
|
|
else if(divSigmaExpMethod == "surface")
|
|
{
|
|
divSigmaExp = fvc::div
|
|
(
|
|
muf*(mesh.Sf() & fvc::interpolate(gradU.T()))
|
|
+ lambdaf*(mesh.Sf() & I*fvc::interpolate(tr(gradU)))
|
|
- (muf + lambdaf)*(mesh.Sf() & fvc::interpolate(gradU))
|
|
);
|
|
}
|
|
else if(divSigmaExpMethod == "decompose")
|
|
{
|
|
snGradU = fvc::snGrad(U);
|
|
|
|
surfaceTensorField shearGradU = ((I - n*n) & fvc::interpolate(gradU));
|
|
|
|
divSigmaExp = fvc::div
|
|
(
|
|
mesh.magSf()*
|
|
(
|
|
- (muf + lambdaf)*(snGradU & (I - n*n))
|
|
+ lambdaf*tr(shearGradU & (I - n*n))*n
|
|
+ muf*(shearGradU & n)
|
|
)
|
|
);
|
|
}
|
|
else if(divSigmaExpMethod == "expLaplacian")
|
|
{
|
|
divSigmaExp =
|
|
- fvc::laplacian(mu + lambda, U, "laplacian(DU,U)")
|
|
+ fvc::div(mu*gradU.T() + lambda*(I*tr(gradU)), "div(sigma)");
|
|
}
|
|
else
|
|
{
|
|
FatalErrorIn(args.executable())
|
|
<< "divSigmaExp method " << divSigmaExpMethod << " not found!" << endl;
|
|
}
|