{"id":159625,"date":"2021-06-18T19:02:03","date_gmt":"2021-06-18T19:02:03","guid":{"rendered":"\/forum\/forums\/topic\/velocity-derivatives-in-cfd-post\/"},"modified":"2021-06-22T06:07:27","modified_gmt":"2021-06-22T06:07:27","slug":"velocity-derivatives-in-cfd-post","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/velocity-derivatives-in-cfd-post\/","title":{"rendered":"velocity derivatives in cfd post"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>&quot;Velocity&quot; of fluent is named &quot;velocity in Stn frame&quot; in cfd post. I need to calculate vorticity which is dv\/dx &#8211; du\/dy or du\/dy &#8211; dv\/dx depending on clockwise or anti-clockwise rotation. Now the velocity derivatives available in the variables in cfd post are Velocity v.Gradient X, Velocity v.Gradient Y, Velocity u.Gradient Y, Velocity v.Gradient X etc. My understanding is they are &quot;velocity in cfd post&quot; derivative not &quot;velocity in fluent&quot; or &quot;velocity in Stn frame in cfd post&quot; derivative. I couldn&#039;t the derivatives of actual velocity i.e. velocity in Stn frame which my vorticity equation requires. How can I solve this issue? For comparison, I am attaching vorticity contour developed using both cfd post and tecplot.<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/288\/MBXH7UMZLRJ3.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/288\/MBXH7UMZLRJ3.png\" alt=\"compare.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-159625","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_old_reply_author_name_id":["Anonymous"],"_bbp_old_is_reply_anonymous_id":["false"],"_btv_view_count":["3630"],"_bbp_likes_count":["0"],"_bbp_subscription":["4019","289310","263554"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["159625"],"_bbp_forum_id":["27792"],"_bbp_engagement":["118","22555","187385","263554","289310"],"_bbp_voice_count":["5"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["293832"],"_bbp_last_active_id":["293832"],"_bbp_last_active_time":["2023-07-19 11:36:56"]},"test":"mahfuz97"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/159625","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\/159625\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=159625"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}