{"id":367174,"date":"2024-05-16T14:36:57","date_gmt":"2024-05-16T14:36:57","guid":{"rendered":"\/forum\/forums\/topic\/three-dimensional-turbulent-rough-flows-y-calculation\/"},"modified":"2024-05-16T14:36:57","modified_gmt":"2024-05-16T14:36:57","slug":"three-dimensional-turbulent-rough-flows-y-calculation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/three-dimensional-turbulent-rough-flows-y-calculation\/","title":{"rendered":"Three-dimensional turbulent rough flows &#8211; y+ calculation"},"content":{"rendered":"<div class=\"x_elementToProof\" data-ogsc=\"rgb(0, 0, 0)\">Hello, I am currently trying to solve a three-dimensional, turbulent channel flow in a rough walls microfluidic channel. In the ANSYS Meshing I am creating inflation on the surrounding walls of the channel to be able to get a y+ value at around 1, using the &#8220;First layer thickness&#8221; option and thickness equal to double the value of the roughness height, as suggested by the ANSYS manual: &#8220;<em>Note that it is not physically meaningful to have a mesh size such that the wall-adjacent cell is smaller than the roughness height. For best results, make sure that the distance from the wall to the centroid of the wall-adjacent cell is greater than Ks.<\/em>&#8220;.<\/div>\n<div class=\"x_elementToProof\" data-ogsc=\"rgb(0, 0, 0)\">&nbsp;<\/div>\n<div class=\"x_elementToProof\" data-ogsc=\"rgb(0, 0, 0)\">However, I am not able to reach values of y+ at around 1. It is possible to achieve that with very high roughness values, such as the one I am encountering in my Additively Manufactured channel? I have not been able to find anything published so it would be great to get some opinions on this matter.<\/div>\n<div class=\"x_elementToProof\" data-ogsc=\"rgb(0, 0, 0)\">&nbsp;<\/div>\n","protected":false},"template":"","class_list":["post-367174","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["348894","199"],"_bbp_author_ip":["184.24.96.177"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1028"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["367174"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","348894"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["367298"],"_bbp_last_active_id":["367298"],"_bbp_last_active_time":["2024-05-17 10:45:56"]},"test":"nikos-monokrousoscranfield-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/367174","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\/367174\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=367174"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}