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April 8, 2005, 14:57 |
Penalty vs mixed formulation in FEA
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#1 |
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I will appreciate knowing the views of the CFD workers who have experience with both penalty and mixed formulations for the finite element analysis of non-Newtonian, incompressible flows.
Just briefly the reason for this query: My interest is in the simulation of polymer flows in processing equipment. I use my own three-dimensional pentaly-Galerkin finite element code for the solution of the three conservation equations with 8-node hexahedral elements. At times I face severe problems of negative pressures (which are obtained in post-processing from p = -(viscosity)(penalty parameter)div (v-vector)). There are other less troublesome problems too. For these reasons, I am now thinking of developing the simulation code with mixed formulation and see how that goes. Unfortunately, I am unable to dig out any information on the comparison of the two formulations. And so the question with me is: Will the efforts on another code be worthwhile? Regards. |
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