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

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Old   February 6, 2012, 16:39
Default what is the mean of laplacian(2*mu + lambda, U, "laplacian(DU,U)")
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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
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Old   February 6, 2012, 17:18
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Philip Cardiff
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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
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Old   February 7, 2012, 01:13
Default Dear Philip Cardiff
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thanks so much
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