{"id":440502,"date":"2025-09-01T13:10:26","date_gmt":"2025-09-01T13:10:26","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/rocky-dem-fluent-help-2-way-coupling-collapse-particles-are-flying\/"},"modified":"2025-09-01T13:10:26","modified_gmt":"2025-09-01T13:10:26","slug":"rocky-dem-fluent-help-2-way-coupling-collapse-particles-are-flying","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/rocky-dem-fluent-help-2-way-coupling-collapse-particles-are-flying\/","title":{"rendered":"Rocky-dem Fluent Help!!! 2-way coupling collapse, particles are flying"},"content":{"rendered":"<p>&lt;p&gt;Hello, when i run the simulation of cone penetraation test with the airflow from the holes, which is located in the cone surface. and there are 4 holes in the shaft. the timesetp for cfd is 200 times of that of DEM. after runing 1.4s,&nbsp; the particles are suddenly flying. The log shows 2.7% of the particles exceeded 50% the CFD critical explicit time step.<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/09\/01-09-2025-1756732208-Screenshot 2025-09-01 144615.png\" alt=\"\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-440502","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27796"],"_bbp_topic_id":["440502"],"_bbp_author_ip":["134.130.87.7"],"_bbp_last_reply_id":["441595"],"_bbp_last_active_id":["441595"],"_bbp_last_active_time":["2025-09-17 08:57:00"],"_bbp_reply_count":["4"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["342512","478104"],"_btv_view_count":["283"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["342512","478104"]},"test":"b665e8efb11e4f1646692ddc20f81fcac1fbd3a0"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/440502","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/440502\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=440502"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}