{"id":389105,"date":"2024-10-10T14:19:58","date_gmt":"2024-10-10T14:19:58","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cyclone-stairmand-simulation-using-rsm\/"},"modified":"2024-10-10T14:29:30","modified_gmt":"2024-10-10T14:29:30","slug":"cyclone-stairmand-simulation-using-rsm","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cyclone-stairmand-simulation-using-rsm\/","title":{"rendered":"Cyclone (Stairmand) simulation using RSM"},"content":{"rendered":"

<p><p>Hello, I’m trying to simulate a standard Stairmand Cyclone using the RSM model, but struggling to get it to converge and match experimental data (mainly in the center of the cyclone. I’ve refined to around 500.000 cells already and still the the core vortex remains to have a wide section with low tangential velocity. <\/p><p> <\/p><p><span style=”font-size: 14pt;”>I’ve created a mesh using Fluent meshing. Polyhedral mesh with prismatic layers at the wall, using y+>30 approach (wall functions). I’ve extended the inlet\/outlets section since this was found in literature to help get the right velocity profiles: <\/span><\/p><p><span style=”font-size: 14pt;”><br><\/span><\/p><p> <\/p><p><span style=”font-size: 14pt;”>After hybrid initialization, I used SST with curvature correction to get a good initial solution before going to RSM. However, I believe SST with curvature correction should already be able to predict the velocity profiles very well, also in the core. Still, my solution keeps being like the top contour plot and the convergence remains to be rather bad. Based on literature, I don’t think the refinement is the problem. <\/span><\/p><p><span style=”font-size: 14pt;”>I’m using velocity inlet 10 m\/s, top and bottom pressure outlet. Second order numerical schemes. Pseudo with time scale factor between 0.1 and 1.0 according to residual behavior. <\/span><\/p><p><span style=”font-size: 14pt;”>Anyone experienced with cyclone simulation that has a clue on how to solve the issue?<\/span><\/p><p><span style=”font-size: 14pt;”>Thank you in advance. <\/span><\/p><\/p><p>My results look roughly like this (red drawn line) w.r.t. experimental data:<\/p><p><\/p><p><\/p><\/p>\n","protected":false},"template":"","class_list":["post-389105","topic","type-topic","status-publish","hentry","topic-tag-cyclone","topic-tag-cyclone-separator","topic-tag-rsm"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["171.33.129.233"],"_btv_view_count":["859"],"_bbp_topic_status":["unanswered"],"_edit_last":["468410"],"_bbp_revision_log":["a:2:{i:389106;a:2:{s:6:\"author\";i:468410;s:6:\"reason\";s:0:\"\";}i:389108;a:2:{s:6:\"author\";i:468410;s:6:\"reason\";s:0:\"\";}}"],"_bbp_subscription":["468410","199"],"_bbp_topic_id":["389105"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","468410"],"_bbp_voice_count":["2"],"_bbp_reply_count":["36"],"_bbp_last_reply_id":["391743"],"_bbp_last_active_id":["391743"],"_bbp_last_active_time":["2024-10-29 13:49:45"]},"test":"c139f658225cb29d368aa1035349adf6b9cb667d"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/389105","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":2,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/389105\/revisions"}],"predecessor-version":[{"id":389108,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/389105\/revisions\/389108"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=389105"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}