{"id":38420,"date":"2019-10-20T20:18:30","date_gmt":"2019-10-20T20:18:30","guid":{"rendered":"\/forum\/forums\/topic\/drag-coefficient-calculation-reference-values\/"},"modified":"2019-10-20T20:18:30","modified_gmt":"2019-10-20T20:18:30","slug":"drag-coefficient-calculation-reference-values","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/drag-coefficient-calculation-reference-values\/","title":{"rendered":"Drag coefficient calculation &#8211; Reference values"},"content":{"rendered":"<p>Hi,<\/p>\n<p><\/p>\n<p>I&#8217;m trying to calculate the drag coefficient of a cylinder with 100 mm diameter . The simulation is 2D and the flow material is air ro = 1.225 kg\/m3 and viscosity = 10^-5 m2\/s. I&#8217;m using a k-epsilon model with curvature and kinetic energy production limiter set on. The mesh provides a y+ &lt; 1.<\/p>\n<p><\/p>\n<p>The values I get are very small, around 0.03&nbsp;when should be around 1.4.<\/p>\n<p><\/p>\n<p>I tried to improve the results by changing the reference values, from Area = 1 m2, Depth = 1 m, Length 1 m to Area = pi*r^2&nbsp;m2, Depth =&nbsp;2*pi*r m, Length&nbsp;2*pi*r m. The result I get for these reference values is Cd = 1.0.<\/p>\n<p><\/p>\n<p>Does anyone know how I could further improve my result to get a Cd closer to 1.4?<\/p>\n<p><\/p>\n<p>Thank you<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-38420","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["10598"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1442"],"_bbp_subscription":["239578"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["38420"],"_bbp_forum_id":["27792"],"_bbp_engagement":["22555","163954"],"_bbp_voice_count":["2"],"_bbp_reply_count":["5"],"_bbp_last_reply_id":["96552"],"_bbp_last_active_id":["96552"],"_bbp_last_active_time":["2019-10-21 15:06:19"]},"test":"egorbena"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/38420","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\/38420\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=38420"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}