{"id":298295,"date":"2023-08-05T04:29:31","date_gmt":"2023-08-05T04:29:31","guid":{"rendered":"\/forum\/forums\/topic\/i-need-some-help-2\/"},"modified":"2023-08-05T04:29:31","modified_gmt":"2023-08-05T04:29:31","slug":"i-need-some-help-2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/i-need-some-help-2\/","title":{"rendered":"I need some help"},"content":{"rendered":"<p>Why does the solid domain wall and the fluid domain wall not bounce after contact when using dynamic or overset grid calculations?For example, simulate a ball falling into the well, in the sinking process because of 6dof swaying left and right, hit the boundary of the well, will not bounce, but continue to calculate, and then the ball will go out through the wall to the outside of the computing domain. After that, I found that there was a contact detection option in the dynamic grid, which seemed to use UDF, and after reading the fluent help documentation, I did not find relevant guidance, most of the time about DPM or DEM.<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/05-08-2023-1691209659-a2126ac9865ac38ffb5b9945c1141521.jpg\" alt=\"\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/05-08-2023-1691209690-0514f863eef93312bb8c963fe045b829.jpg\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-298295","topic","type-topic","status-closed","hentry","topic-tag-cfd-dem","topic-tag-dpm","topic-tag-dynamic-mesh"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Why does the solid domain wall and the fluid domain wall not bounce after contact when using dynamic or overset grid calculations?For example, simulate a ball 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