# Multiple FRD files instead one file

**URL:** <https://calculix.discourse.group/t/multiple-frd-files-instead-one-file/4032>\
**Category:** Postprocessing/Visualization\
**Created:** [July 6, 2026, 7:41pm UTC](https://calculix.discourse.group/t/multiple-frd-files-instead-one-file/4032 "2026-07-06T19:41:45Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jr90236](https://avatars.discourse-cdn.com/v4/letter/j/6bbea6/32.png) [@jr90236](https://calculix.discourse.group/u/jr90236)\
**Post date:** [July 6, 2026, 7:41pm UTC](https://calculix.discourse.group/t/multiple-frd-files-instead-one-file/4032/1 "2026-07-06T19:41:45Z")

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Hi everyone,

I am running a thermal analysis, and sometimes the FRD file becomes very large. I am considering modifying the solver so that it writes multiple FRD files, perhaps every 10 increments or something similar.

What would be the implications of this change? Do you have any suggestions?

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**Author:** ![Calc\_em](https://avatars.discourse-cdn.com/v4/letter/c/43a26b/32.png) [@Calc\_em](https://calculix.discourse.group/u/Calc_em)\
**Post date:** [July 6, 2026, 7:50pm UTC](https://calculix.discourse.group/t/multiple-frd-files-instead-one-file/4032/2 "2026-07-06T19:50:14Z")

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Maybe you could use `*RESTART` to split the analysis into stages (steps). Also consider reducing the amount and frequency of field output being requested.

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**Author:** ![Durbul](https://avatars.discourse-cdn.com/v4/letter/d/8dc957/32.png) [@Durbul](https://calculix.discourse.group/u/Durbul)\
**Post date:** [July 7, 2026, 7:20pm UTC](https://calculix.discourse.group/t/multiple-frd-files-instead-one-file/4032/3 "2026-07-07T19:20:44Z")

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If none of these suggestions work for you, I would rather try writing a small script to split your frd file at the end than modify the code.