{"id":347935,"date":"2024-01-31T14:02:04","date_gmt":"2024-01-31T14:02:04","guid":{"rendered":"\/forum\/forums\/topic\/calculation-diverges-when-mesh-is-refined\/"},"modified":"2024-01-31T14:02:04","modified_gmt":"2024-01-31T14:02:04","slug":"calculation-diverges-when-mesh-is-refined","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/calculation-diverges-when-mesh-is-refined\/","title":{"rendered":"Calculation diverges when mesh is refined"},"content":{"rendered":"<p>I am trying to do a saturated pool boiling simulation over a finned surface.<\/p>\n<p>I did initial simulation with coarce mesh and I got some initial results without much problem. I am using VOF method with lee model for evaporation-condensation.&nbsp;<\/p>\n<p>Now, when I refine mesh and run the simulation with same setup, the solution diverges. I can not understand what is wrong here. I tried choosing first order as well as second order schemes. Also, I reduced time step from 0.001 s to 0.00000001 s. But, still the solution diverges at initial time steps itself. What can be the possible reason?&nbsp;<br \/>&nbsp;<br \/>Coarse mesh<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/31-01-2024-1706709424-coarce.PNG\" alt=\"\"><\/p>\n<p>Fine Mesh<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/31-01-2024-1706709565-fine.PNG\" alt=\"\"><\/p>\n<p>Residuals:<br \/><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/31-01-2024-1706709591-residual.PNG\" alt=\"\"><\/p>\n","protected":false},"template":"","class_list":["post-347935","topic","type-topic","status-closed","hentry","topic-tag-boiling","topic-tag-lee-model-1","topic-tag-multiphase","topic-tag-vof"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["32604","199"],"_bbp_author_ip":["23.52.43.16"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["565"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["347935"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","32604"],"_bbp_voice_count":["2"],"_bbp_reply_count":["9"],"_bbp_last_reply_id":["349881"],"_bbp_last_active_id":["349881"],"_bbp_last_active_time":["2024-02-08 12:13:19"]},"test":"lirilsilviuaeu-ac-ae"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/347935","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\/347935\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=347935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}