{"id":51012,"date":"2021-01-04T11:19:13","date_gmt":"2021-01-04T11:19:13","guid":{"rendered":"\/forum\/forums\/topic\/cd-value-is-lower-than-expected\/"},"modified":"2021-01-04T11:19:13","modified_gmt":"2021-01-04T11:19:13","slug":"cd-value-is-lower-than-expected","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cd-value-is-lower-than-expected\/","title":{"rendered":"Cd Value is lower than expected."},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hi everyone,<\/p>\n<p>Firstly, a happy new year to you all.<\/p>\n<p>I am carrying out a simulation and my Cd values are lower than expected. I am looking for some help. Thank you.<\/p>\n<p><strong>Simulation Details:<\/strong><\/p>\n<p>Square cylinder (depth = 0.1m) inside a Circular Domain (Dia = 6m).<\/p>\n<p><\/p>\n<\/p>\n<p>I am attaching the simulation results. <\/p>\n<p>1) After around 4000 iterations, the solution diverges (residuals fluctuate in a wider range). <\/p>\n<p>2) I am not sure why the Cd value is low. Re for the simulation is around 13000 and the Cd should be around 2.1, I get a value of around ~1.5. Do I need to use the Non-iterative Time Advancement?<\/p>\n<p><\/p>\n<\/p>\n<p>Any help is appreciated. Thank you.<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/R8HP5ADXIM4A\/1-residuals-jpg.jpg\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/R8HP5ADXIM4A\/1-residuals-jpg.jpg\" alt=\"1 Residuals.JPG\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-51012","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["23267"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["?\u0003?c"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1722"],"_bbp_subscription":["255421"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["51012"],"_bbp_forum_id":["27792"],"_bbp_engagement":["25","62","199","181302"],"_bbp_voice_count":["4"],"_bbp_reply_count":["22"],"_bbp_last_reply_id":["137942"],"_bbp_last_active_id":["137942"],"_bbp_last_active_time":["2021-01-07 11:35:48"]},"test":"smalbro93"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/51012","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\/51012\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=51012"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}