{"id":314346,"date":"2023-11-01T14:19:04","date_gmt":"2023-11-01T14:19:04","guid":{"rendered":"\/forum\/forums\/topic\/mesh-independence-study-3\/"},"modified":"2023-11-03T16:27:50","modified_gmt":"2023-11-03T16:27:50","slug":"mesh-independence-study-3","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mesh-independence-study-3\/","title":{"rendered":"Mesh Independence study"},"content":{"rendered":"<p>Hi to all,<\/p>\n<p>I am working on a 3D airfoil. Currently, I am doing a mesh independence study to assess the dependence of the simulation results.<br \/>For this purpose, I plot the two parameters CL and CD when calculating. My solver is Fluent and I use <em>K-W SST<\/em> turbulence model. My mesh is the structure that I produced in icem-cfd.&nbsp;<br \/>I first started with a <em>552K<\/em> cell mesh with&nbsp; <em>Y+ &lt;1<\/em> , and the residuals converged very well. which is according to the following figure:<\/p>\n<p style=\"padding-left: 80px\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/01-11-2023-1698847768-w1.PNG\" alt=\"\" width=\"751\" height=\"375\"><\/p>\n<p style=\"padding-left: 80px\">&nbsp;<\/p>\n<p>Now, I increased the number of grid cells to 1,263,000 cells, but unfortunately, this time, the residuals fluctuate strongly and do not intend to converge, and I also receive the message (Stabilizing pressure coupled to enhance linear solver robustness.) repeatedly when solving, which is as follows:<\/p>\n<p style=\"padding-left: 80px\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/01-11-2023-1698847844-y3.PNG\" alt=\"\" width=\"771\" height=\"599\"><\/p>\n<p style=\"padding-left: 80px\">I really wonder why this is happening. To create a new mesh, I did not change the growth rate of the block lines at all, and only increased the number of nodes of the block lines, and at the end, I checked the mesh quality parameters, which were very good.<\/p>\n<p>I was very tired and disappointed.<\/p>\n<p>what is happening? Can anyone help me to solve the problem?<\/p>\n<p>If someone helps me, I will thank you a thousand times and I wish him health and well-being from the bottom of my heart.<\/p>\n<p>Regards<\/p>\n","protected":false},"template":"","class_list":["post-314346","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["17026","199"],"_bbp_author_ip":["96.7.218.215"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["2820"],"_bbp_status":["publish"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["314346"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","17026"],"_bbp_voice_count":["2"],"_bbp_reply_count":["11"],"_bbp_last_reply_id":["314810"],"_bbp_last_active_id":["314810"],"_bbp_last_active_time":["2023-11-03 16:35:46"]},"test":"a-karimi8457gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/314346","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\/314346\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=314346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}