{"id":166087,"date":"2022-02-03T17:00:59","date_gmt":"2022-02-03T17:00:59","guid":{"rendered":"\/forum\/forums\/topic\/wild-oscillations-in-cp-and-cf\/"},"modified":"2022-02-10T18:59:42","modified_gmt":"2022-02-10T18:59:42","slug":"wild-oscillations-in-cp-and-cf","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/wild-oscillations-in-cp-and-cf\/","title":{"rendered":"Wild Oscillations in Cp and Cf?"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hello,<\/p>\n<p>I&#039;m using adaption to refine an existing solution but my final result plots along the wall oscillate wildly. They&#039;re oscillating around the right answer (from other papers etc.) but they seem highly unsteady. See images below for Cp and Cf along the wall. It&#039;s a 2D transonic flow case, and I&#039;m using second-order Upwind scheme with density-based solver. I&#039;ve tried adjusting Courant number from 0.1 to 5 and that didn&#039;t seem to help. I&#039;ve run over 100,000 iterations per adaption iteration (10 iterations total) so it should be converged. The oscillations actually get progressively worse over each adaption iteration. I&#039;ve tried the pressure-based solver with velocity coupling, didn&#039;t help. I tried third order MUSCL, also didn&#039;t fix it.<\/p>\n<p>I&#039;ve really exhausted a lot of options and I&#039;m still unsure if it&#039;s a problem with the numerics or the grid or just something fundamentally wrong. I looked on other forums and <a href=\"https:\/\/tinyurl.com\/yvumk9sy\" rel=\"nofollow\">some people have faced a similar issue<\/a> but without a solution. I&#039;m hoping someone here can help fix this, please? Or at least point to maybe where I&#039;m going wrong.<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/699\/CIYVAIKMQQXO.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/699\/CIYVAIKMQQXO.png\" alt=\"image.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-166087","topic","type-topic","status-closed","hentry","topic-tag-adaption-1","topic-tag-cfd","topic-tag-fluent","topic-tag-fluids","topic-tag-oscillation"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["562"],"_bbp_likes_count":["0"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["166087"],"_bbp_forum_id":["27792"],"_bbp_engagement":["25","186624"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["204494"],"_bbp_last_active_id":["204494"],"_bbp_last_active_time":["2022-02-10 18:59:42"]},"test":"arjunv"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/166087","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\/166087\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=166087"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}