{"id":158052,"date":"2021-05-02T09:49:49","date_gmt":"2021-05-02T09:49:49","guid":{"rendered":"\/forum\/forums\/topic\/turbulent-viscosity-ratio-limited-to-xxx-cells\/"},"modified":"2021-05-03T06:30:53","modified_gmt":"2021-05-03T06:30:53","slug":"turbulent-viscosity-ratio-limited-to-xxx-cells","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/turbulent-viscosity-ratio-limited-to-xxx-cells\/","title":{"rendered":"turbulent viscosity ratio limited to XXX cells ?"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>I am trying to calculate coefficient of performance for a vertical axis wind turbine. The turbine blade is 90 meter long. While running simulation in fluent, initial residuals are converging well. After a while, the warning appears saying &#039;turbulent viscosity limited to viscosity ratio of 1.000000e+05 in XXX cells&#039;. I checked the areas where the turbulent viscosity ratios are very high. Initially it is around the interface area where I am using sliding mesh interface. Then the number of cells keeps on increasing, mostly outside of inner rotating domain. I found on the internet that it could be because the turbulent eddies are not being properly resolved as a result of large mesh size or non-uniformity of mesh. I checked the non-uniformity of mesh around the interface and refined it. The problem was still there. I also tried reducing the time step, increasing or decreasing relaxation parameters, altering turbulence model but couldn&#039;t get out of the problem. I am getting the results from the simulation, but I am sure the results are non-physical. What could be the issue causing high turbulent viscosity ratio. Is it because of two interfaces having different distribution of mesh or the shape of interface? <\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/269\/43RRXMGDLNKM.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/269\/43RRXMGDLNKM.png\" alt=\"image.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-158052","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_old_reply_author_name_id":["Anonymous"],"_bbp_old_is_reply_anonymous_id":["false"],"_btv_view_count":["3569"],"_bbp_likes_count":["0"],"_bbp_subscription":["234562"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["158052"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","190271"],"_bbp_voice_count":["3"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["177121"],"_bbp_last_active_id":["177121"],"_bbp_last_active_time":["2021-05-03 06:30:53"]},"test":"isit12"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/158052","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\/158052\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=158052"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}