FAQ 000065 FR

Calculation RFEM

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


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, which slows down the direct calculation. 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.

RFEM uses a new analysis core for the direct calculation method, which makes it possible to use more random access memory (RAM) when working with a 64-bit operating system. Now, you can directly calculate all load cases and load combinations also for larger systems that do not have any non-linear elements, which saves you a lot of time.



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