# laplacian problem

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 August 20, 2011, 16:56 laplacian problem #1 Senior Member   Mieszko Młody Join Date: Mar 2009 Location: POLAND, USA Posts: 129 Rep Power: 8 Dear Foamers, I am trying to solve following problem: Fun = Fun (x,y) Fun_xxxx = f(x,y), where ()_xxxx, denotes 4th order derivative in respect to x. To do this I changed the original problem to, set of two two-order equations: H_xx = f(x,y) Fun_xx = H. To solve it in OpenFoam I am usning fvm::laplacian(1D,fun) operator with 1D being a tensor, definite as follows: 1D = (1 0 0; 0 0 0; 0 0 0), what force laplacian operator to act only in x-direction. In OF it looks like: solve ( fvm::laplacian(1D, H) - f ); solve ( fvm::laplacian(1D, Fun) - H ); But unfortunately it gives wrong results ... Does anyone of you know what is here wrong ? thanks a lot ZM

 Tags diffusion coefficient, laplacian, non-uniform, operator, viscosity

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