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FAQ 003008 EN

26 April 2019

Frank Faulstich Calculation RFEM

Why is the unsymmetric solver successful?

Answer

The asymmetric equation solver can improve the convergence. However, it should only be activated if there are really convergence problems.

For certain material models, you are also prompted to activate the unsymmetric equation solver.

When using the "normal" equation solver, only one side of the matrix has to be stored because it is symmetric to the main diagonal. In the case of an unsymmetric equation solver, both sides have to be saved and, of course, created beforehand. This takes more RAM and a longer processing time.

For a model that already converges well anyway, the unsymmetric equation solver leads to a longer computing time.

Keywords

Solver Stiffness matrix Calculation parameters

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