{"id":171017,"date":"2023-06-05T07:05:31","date_gmt":"2023-06-05T07:05:31","guid":{"rendered":"\/knowledge\/forums\/topic\/why-is-the-actual-coarsening-rate-so-high-and-the-number-of-radiation-elements-so-low-if-i-am-using-a-discrete-transfer-radiation-model-with-surface-to-surface-option-in-ansys-cfx\/"},"modified":"2023-07-31T12:29:53","modified_gmt":"2023-07-31T12:29:53","slug":"why-is-the-actual-coarsening-rate-so-high-and-the-number-of-radiation-elements-so-low-if-i-am-using-a-discrete-transfer-radiation-model-with-surface-to-surface-option-in-ansys-cfx","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/why-is-the-actual-coarsening-rate-so-high-and-the-number-of-radiation-elements-so-low-if-i-am-using-a-discrete-transfer-radiation-model-with-surface-to-surface-option-in-ansys-cfx\/","title":{"rendered":"Why is the actual coarsening rate so high and the number of radiation elements so low if I am using a discrete transfer radiation model with surface to surface option in ANSYS CFX?"},"content":{"rendered":"

The coarsening rate has no actual meaning when using discrete transfer radiation model without participating media, since no coarsening is applied. When using the surface to surface option, the solver essentially reduces the volume mesh to a \u201csingle cell\u201d or a small number of cells. This is why the coarsening rate is so high and the number of radiation elements (\u201cvolume cells\u201d) is so low.<\/p>\n","protected":false},"template":"","class_list":["post-171017","topic","type-topic","status-publish","hentry","topic-tag-4424","topic-tag-cfx","topic-tag-discrete-transfer","topic-tag-fluid-dynamics","topic-tag-heat-transfer-and-radiation","topic-tag-heat-transfer","topic-tag-radiation"],"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