{"id":171020,"date":"2023-06-05T07:05:31","date_gmt":"2023-06-05T07:05:31","guid":{"rendered":"\/knowledge\/forums\/topic\/if-you-have-a-run-that-fails-with-the-following-error-error-002100029-has-occurred-in-subroutine-cucoef\/"},"modified":"2023-07-31T12:29:53","modified_gmt":"2023-07-31T12:29:53","slug":"if-you-have-a-run-that-fails-with-the-following-error-error-002100029-has-occurred-in-subroutine-cucoef","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/if-you-have-a-run-that-fails-with-the-following-error-error-002100029-has-occurred-in-subroutine-cucoef\/","title":{"rendered":"If you have a run that fails with the following error: +——————————————————————–+ | ERROR #002100029 has occurred in subroutine cUCOEF. | | Message: | | The solver has detected a negative Uplus in the turbulent wall | | functions. The likely reason is a wall roughness which is too | | large. Please check that the wall roughness is correct. | +——————————————————————–+"},"content":{"rendered":"

This is typically due to having a wall roughness setting that is the same or larger than the first cell height. To check, first run the case with no rough walls. If successful, change the mesh or roughness height to ensure the roughness height value is less than the first cell height everywhere.<\/p>\n","protected":false},"template":"","class_list":["post-171020","topic","type-topic","status-publish","hentry","topic-tag-5474","topic-tag-17-2","topic-tag-cfx","topic-tag-fluid-dynamics","topic-tag-general-cfx","topic-tag-wall-roughness"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t