{"id":250369,"date":"2023-02-17T10:52:27","date_gmt":"2023-02-17T10:52:27","guid":{"rendered":"\/forum\/forums\/topic\/use-of-convergence-condition-vs-residuals-cfd\/"},"modified":"2023-02-17T10:52:27","modified_gmt":"2023-02-17T10:52:27","slug":"use-of-convergence-condition-vs-residuals-cfd","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/use-of-convergence-condition-vs-residuals-cfd\/","title":{"rendered":"Use of convergence condition vs residuals &#8211; CFD"},"content":{"rendered":"<p>I am checking the <strong>drag coefficient<\/strong>, and I thought maybe to use a&nbsp;<strong>convergence condition<\/strong>&nbsp;of the drag by defining a stop criterion of 1e-05 and use iterations 5.<\/p>\n<p>If I apply this, convergence condition of the drag coefficient is met with&nbsp;<strong>continuity residual<\/strong> around 1e-03. As far as I have heard, a residual of 1e-05 would be a &ldquo;nice&rdquo; one. But the convergence condition is met before, is it okay to automatically stop the iterations of this time step when the convergence condition is met (in this case <strong>continuity residual<\/strong> is 1e-03) or should I wait for residuals to reach&nbsp;<strong>continuity residual&nbsp;<\/strong>1e-05 <em>even though drag coefficient per iteration does not vary<\/em>?<\/p>\n<p>I mean, am I loosing too much &ldquo;reality&rdquo; by stopping the time step when drag coefficients criteria are met?<\/p>\n<p>I attached a plot to ease what I am trying to explain!<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/02\/17-02-2023-1676631065-mceclip0.png\" width=\"1004\" height=\"731\"><\/p>\n","protected":false},"template":"","class_list":["post-250369","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["2267","199"],"_bbp_author_ip":["23.192.164.18"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1178"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["250369"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","2267"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["250403"],"_bbp_last_active_id":["250403"],"_bbp_last_active_time":["2023-02-17 14:11:53"]},"test":"pv00170surrey-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/250369","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\/250369\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=250369"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}