{"id":165570,"date":"2023-03-17T09:00:39","date_gmt":"2023-03-17T09:00:39","guid":{"rendered":"\/knowledge\/forums\/topic\/why-is-my-radiation-model-aborting-with-a-negative-temperature\/"},"modified":"2023-07-31T12:31:31","modified_gmt":"2023-07-31T12:31:31","slug":"why-is-my-radiation-model-aborting-with-a-negative-temperature","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/why-is-my-radiation-model-aborting-with-a-negative-temperature\/","title":{"rendered":"Why is my radiation model aborting with a negative temperature?"},"content":{"rendered":"

You have not specified a temperature offset value with TOFFST or an initial model temperature, so the initial model temperature is at absolute zero. Any small numerical fluctuation can then produce a negative temperature. It is desirable to use relative temperatures for boundary conditions and specify the offset from absolute with TOFFST. For example, use TOFFST,273 for Centigrade. Convergence is quicker if an initial model temperature is specified in the ballpark of the expected final temperature.<\/p>\n","protected":false},"template":"","class_list":["post-165570","topic","type-topic","status-publish","hentry","topic-tag-4431","topic-tag-mechanical-apdl","topic-tag-radiation","topic-tag-structural-and-thermal","topic-tag-structural-mechanics","topic-tag-thermal"],"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