{"id":43662,"date":"2020-05-05T23:32:00","date_gmt":"2020-05-05T23:32:00","guid":{"rendered":"\/forum\/forums\/topic\/fluent-flow-courant-number-value\/"},"modified":"2020-05-05T23:32:00","modified_gmt":"2020-05-05T23:32:00","slug":"fluent-flow-courant-number-value","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-flow-courant-number-value\/","title":{"rendered":"Fluent : Flow Courant Number Value ?!!"},"content":{"rendered":"<p><span style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">Hello evryone<\/span><br style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\"><span style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">Hope this messages finds you all in good health<\/span><br style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\"><br style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\"><span style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">i am solving a 2D airfoil simulation&nbsp;<\/span><strong style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">(transient simulation using fluent&nbsp;<\/strong><span style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">) with KWSST turbulence model and for the Pressure-velocity coupling i chose COUPLED ,but under&nbsp;<\/span><strong style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">Controls &gt; solution Controls<\/strong><span style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">&nbsp;there is&nbsp;<\/span><strong style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">Flow Courant number<\/strong><span style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">&nbsp;and which is by default&nbsp;<\/span><strong style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">200<\/strong><span style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">&nbsp;which confused me because :<\/span><br style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\"><br style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\"><strong style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">From my previous experience&nbsp; From the Articles i ve read on the internet they recommend CFL&lt;=1 , but when i look on the fluent user&#8217;s guide i found that Flow Courant Number has to be specified when using Coupled algorithm but it should not be less than 10 !!! Can anyone please help me and explain to me Why is this difference ? And How much Value should i Set for CFL?<\/strong><br style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\"><br style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\"><span style=\"color: #000000; font-family: verdana, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif; font-size: 13.3333px; background-color: #f7f7f7;\">Many Thanks<\/span><\/p>\n","protected":false},"template":"","class_list":["post-43662","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["15843"],"_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":["4377"],"_bbp_subscription":["245838"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["43662"],"_bbp_forum_id":["27792"],"_bbp_engagement":["22555","171497","171695"],"_bbp_voice_count":["3"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["113672"],"_bbp_last_active_id":["113672"],"_bbp_last_active_time":["2020-05-06 09:18:54"]},"test":"losiola"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/43662","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\/43662\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=43662"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}