{"id":289118,"date":"2023-06-16T11:23:29","date_gmt":"2023-06-16T11:23:29","guid":{"rendered":"\/forum\/?post_type=topic&#038;p=289118"},"modified":"2023-06-16T11:23:29","modified_gmt":"2023-06-16T11:23:29","slug":"negative-drag-coefficient-on-naca-0021-aerofoil","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/negative-drag-coefficient-on-naca-0021-aerofoil\/","title":{"rendered":"Negative Drag Coefficient on NACA 0021 aerofoil"},"content":{"rendered":"<p>I have to analyse the lift and drag coefficient of a NACA 0021 aerofoil compared with a magnus effect modified versoion on ansys for my dissertation.<\/p>\n<p>for an odd reason i have a negative coefficient of drag on my model, i have looked at other forums for answers and i can&#8217;t find a solution.<\/p>\n<p>my settings for my simulation are:<\/p>\n<p>inlet velocity: 25m\/s<br \/>viscous model k-omega sst<br \/>first cell height: 0.000012208311253141898m<br \/>reference values taken from inlet on reference zone surface<br \/>with the lift and drag being calculated from the aerofoil surface<\/p>\n<p>im not sure if the easy fix for this issue is to just calculate the drag in the negative x direction<\/p>\n","protected":false},"template":"","class_list":["post-289118","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["23.47.145.29"],"_bbp_subscription":["287432","199"],"_btv_view_count":["262"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["289118"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","287432"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["289125"],"_bbp_last_active_id":["289125"],"_bbp_last_active_time":["2023-06-16 11:59:19"]},"test":"taylorc11uni-coventry-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/289118","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\/289118\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=289118"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}