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FAQ 003626 EN

1 December 2017

Robert Vogl Calculation RFEM

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


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 sized systems, the direct method is more effective.
  • For very large structures, the iterative method leads to results more quickly.
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. This memory problem can be avoided by switching to the iterative ICG (Incomplete Conjugate Gradient) calculation method. 


Equation solving method Directly Iteratively Solver Equation system

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