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-   -   what is the mean of laplacian(2*mu + lambda, U, "laplacian(DU,U)") (http://www.cfd-online.com/Forums/openfoam/96989-what-mean-laplacian-2-mu-lambda-u-laplacian-du-u.html)

mechy February 6, 2012 17:39

what is the mean of laplacian(2*mu + lambda, U, "laplacian(DU,U)")
 
Dear Foamer

in stressedFoam or solidDisplacementFoam solvers
there is the fvm::laplacian(2*mu + lambda, U, "laplacian(DU,U)") term
what is the mean of "laplacian(DU,U)" in the above term

also what is the mean of "div(sigma)" in the bellow term
fvc::div
(
mu*gradU.T() + lambda*(I*tr(gradU)) - (mu + lambda)*gradU,
"div(sigma)"
)

best regards

bigphil February 6, 2012 18:18

Hi,

laplacian(DU,U) and div(sigma) are just keywords, so when OpenFOAM calculates the laplacian/divergence terms it will look up what laplacian/divergence method to use in system/fvSchemes beside the given keyword.

Philip

mechy February 7, 2012 02:13

Dear Philip Cardiff
 
thanks so much


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