FEKO: Is there a way to add a solution request to a large problem without solving the matrix again?

Maruf Hossain_21119
Maruf Hossain_21119 Altair Community Member
edited December 2023 in Community Q&A

I have a large antenna problem that takes almost 8 hours for a MoM run. Let's say after it was solved once, I need to increase the angular resolution of the far field request. Is there any way to do that without solving the problem again and waiting 8 hours? 


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Answers

  • Torben Voigt
    Torben Voigt
    Altair Employee
    edited December 2023

    Hi Maruf,

    In the Solver Settings, when selecting "Read from file if it exists, otherwise create it" for the .str file (currents), the solver will re-use the .str file if possible. This will work, if the .str file is valid (frequencies not changed, geometry/mesh not changed etc.).

    Note, for very large models the .str file can become quite large.

    image

    Best regards,
    Torben

  • Maruf Hossain_21119
    Maruf Hossain_21119 Altair Community Member
    edited December 2023
    Torben Voigt_20420 said:

    Hi Maruf,

    In the Solver Settings, when selecting "Read from file if it exists, otherwise create it" for the .str file (currents), the solver will re-use the .str file if possible. This will work, if the .str file is valid (frequencies not changed, geometry/mesh not changed etc.).

    Note, for very large models the .str file can become quite large.

    image

    Best regards,
    Torben

    Thanks Torben. Is the str file saved automatically? A follow-up question is, can I add a new request without wiping out the old ones using the str files? It seems when I rerun the model in CADFEKO, it asks forces me to overwrite previous solutions.

  • Torben Voigt
    Torben Voigt
    Altair Employee
    edited December 2023
    Maruf Hossain_21119 said:

    Thanks Torben. Is the str file saved automatically? A follow-up question is, can I add a new request without wiping out the old ones using the str files? It seems when I rerun the model in CADFEKO, it asks forces me to overwrite previous solutions.

    Hi Maruf,

    As you have probably already tested by now, the .str file is automatically saved in the project folder. It is then reused if possible. For example, if you change a request or add more requests after a successful simulation, the .str file will be used and the simulation will be much faster than the original one. Previous results will of course be overwritten (.bof file), as you are simulating again.

    Best regards,
    Torben

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