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 
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 
Dear Philip Cardiff
thanks so much

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