# Wind Speed-Related Issues

**URL:** <https://discourse.ladybug.tools/t/wind-speed-related-issues/39832>\
**Category:** butterfly\
**Created:** [January 13, 2026, 8:35am UTC](https://discourse.ladybug.tools/t/wind-speed-related-issues/39832 "2026-01-13T08:35:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dududuji](https://discourse.ladybug.tools/letter_avatar_proxy/v4/letter/d/e19adc/32.png) [@dududuji](https://discourse.ladybug.tools/u/dududuji)\
**Post date:** [January 13, 2026, 8:35am UTC](https://discourse.ladybug.tools/t/wind-speed-related-issues/39832/1 "2026-01-13T08:35:05Z")

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![41957a97-724a-466b-b9ce-167808da5692](https://discourse.ladybug.tools/uploads/default/original/3X/a/4/a4f53e0767e1c2f98f094224e9e8f8a1aa353770.jpeg)  
When butterfly\_decomposeParDict is connected to butterfly\_snappyHexMesh’s decompose\_par\_dict\_scotch, it crashes. If not connected, it runs but produces extremely high wind speeds, likely incorrect results.

This issue didn’t occur during previous runs and only appeared recently. Thank you for your assistance.

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**Author:** ![dududuji](https://discourse.ladybug.tools/letter_avatar_proxy/v4/letter/d/e19adc/32.png) [@dududuji](https://discourse.ladybug.tools/u/dududuji)\
**Post date:** [January 15, 2026, 3:25am UTC](https://discourse.ladybug.tools/t/wind-speed-related-issues/39832/2 "2026-01-15T03:25:03Z")

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I’ve identified the cause of the error—my CFD was mistakenly deleted by the antivirus software.