FAQ 000065 EN

Calculation RFEM

When do I apply the different equation solving methods with "direct" and "iterative"?

Answer

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

  • For small and medium size systems, the direct solver method is more effective.
  • For big and complex systems, the iterative method is faster for results output.


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.

By using the direct calculation method, it it possible to use more random access memory (RAM) when working with a 64-bit operating system. Now, you can directly calculate larger systems with all load cases and load combinations, which saves you a lot of time.

Key words

equation solving method direct iterative solver equation solver

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