{"id":157634,"date":"2020-08-13T21:07:03","date_gmt":"2020-08-13T21:07:03","guid":{"rendered":"\/forum\/forums\/topic\/divergence-of-results-2\/"},"modified":"2020-11-23T06:19:06","modified_gmt":"2020-11-23T06:19:06","slug":"divergence-of-results-2","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/divergence-of-results-2\/","title":{"rendered":"Divergence of results"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>I am trying to simulate condensation of mixture of water vapor(0.025 mass fraction) and air @ 300K,27C ,1m\/s coming in contact with cooling coils at constant temp of 283K. To perform this in fluent i used following 2 different scenarios<\/p>\n<p><\/p>\n<\/p>\n<p>Case 1:<\/p>\n<p>1)Using Mixture Eulerian model with built in condensation model (Lee model)<\/p>\n<p>One phase is mixture of air and water vapor<\/p>\n<p>Another phase is only water liquid . Condensation is then defined using mass transfer mechanism and I defined a custom function for setting saturation temperature depending on vapor pressure with UDF<\/p>\n<p><\/p>\n<\/p>\n<p>Case 2:<\/p>\n<p>Use species model physics , euler mixture and species transport model. Use two different mixtures , one phase is mixture of air and water vapor, the other phase is species mixture consisting of only liquid. I define mass transfer using species mass transfer model and saturation pressure is modified as function of temperature . <\/p>\n<p><\/p>\n<\/p>\n<p>In both of these scenarios, the simulation diverges after 2nd iteration. I m attaching error due to divergence from both of these case below <\/p>\n<p><\/p>\n<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/M8P4SBFD01EV\/image.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/M8P4SBFD01EV\/image.png\" alt=\"image.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-157634","topic","type-topic","status-closed","hentry","topic-tag-condensation"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_view_count":["898"],"_bbp_likes_count":["0","0"],"_bbp_forum_subforum_count":["0"],"_btv_view_count":["360"],"_bbp_subscription":["249407"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["157634"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","28718"],"_bbp_voice_count":["2"],"_bbp_reply_count":["10"],"_bbp_last_reply_id":["175938"],"_bbp_last_active_id":["175938"],"_bbp_last_active_time":["2020-11-23 06:19:06"]},"test":"ajayc1160"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/157634","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\/157634\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=157634"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}