{"id":47013,"date":"2020-08-04T09:00:46","date_gmt":"2020-08-04T09:00:46","guid":{"rendered":"\/forum\/forums\/topic\/stabilizing-pressure-coupled-to-enhance-linear-solve-robustness\/"},"modified":"2020-08-04T09:00:46","modified_gmt":"2020-08-04T09:00:46","slug":"stabilizing-pressure-coupled-to-enhance-linear-solve-robustness","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/stabilizing-pressure-coupled-to-enhance-linear-solve-robustness\/","title":{"rendered":"stabilizing pressure coupled to enhance linear solve robustness"},"content":{"rendered":"<p>Hey guys,&nbsp;<br \/>I am currently study the fluid flow around surfboard fins. I have updated programs from ANSYS 19.1 to ANSYS 2020 R1, whilst halfway through working on a project. Originally my solutions were solving very well.&nbsp;<img alt=\"\"><img alt=\"\">(below)<br \/><img decoding=\"async\" alt=\"\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/editor\/a1\/u76onyamiv3q.png\" title=\"Image: https:\/\/us.v-cdn.net\/6032193\/uploads\/editor\/a1\/u76onyamiv3q.png\"><br \/>They would take a while but solved to 1e-03 with a smooth gradual convergence on the residuals, but after the switch to the new version the <b>exact<\/b> same calculations have had a strange results. The residual graph has wild fluctuations and there is a message in the console that states &#8220;stabilizing pressure coupled to enhance linear solve robustness&#8221;.<img decoding=\"async\" alt=\"\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/editor\/n1\/j25o9dgw9nbs.png\" title=\"Image: https:\/\/us.v-cdn.net\/6032193\/uploads\/editor\/n1\/j25o9dgw9nbs.png\"><br \/>I tried opening the old ANSYS files to solve this and creating a totally new project, no change between them. Is there some new default feature I have missed? Beyond that could someone help explain the pressure stabilization because that wasn&#8217;t happening when I was working with ANSYS v19.1.<\/p>\n<p>Any suggestions for a solution would be helpful.<br \/>Cheers,<br \/>Sam Crameri<br \/>Note: There has been no change to meshing or fluent setup (k-w SST solver). happy to supply subsequent information if needed.<\/p>\n","protected":false},"template":"","class_list":["post-47013","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["19207"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["????"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["13671"],"_bbp_subscription":["269524"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["47013"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","180032","186377","269524"],"_bbp_voice_count":["5"],"_bbp_reply_count":["10"],"_bbp_last_reply_id":["290243"],"_bbp_last_active_id":["290243"],"_bbp_last_active_time":["2023-06-25 11:11:17"]},"test":"sam_crameri"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/47013","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\/47013\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=47013"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}