FAQ 000065 EN

1 December 2017

Robert Vogl Calculation RFEM

Which equation solving method should I use, direct and iterative?

Answer

The choice of the solver method leading quickly to results depends on the complexity of the model and the main memory (RAM) that is available:

  • For small and medium size systems, the direct method is more effective.
  • For very big systems, the iterative method leads faster to results.
As soon as the matrices for the direct method cannot be stored any longer in the main memory, Windows starts to swap out parts of the data to the hard disk. The hard disk activities will increase and the processor load will be reduced which is visible in the Windows Task Manager. By using the iterative ICG (Incomplete Conjugate Gradient) calculation method, you can avoid this storage problem.

Keywords

equation solving method direct iterative solver equation system

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RFEM 5.xx

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Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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