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