{"id":381558,"date":"2024-09-04T16:23:00","date_gmt":"2024-09-04T16:23:00","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/divergence-possibly-caused-by-automatic-mesh-refinement\/"},"modified":"2024-09-04T16:23:00","modified_gmt":"2024-09-04T16:23:00","slug":"divergence-possibly-caused-by-automatic-mesh-refinement","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/divergence-possibly-caused-by-automatic-mesh-refinement\/","title":{"rendered":"Divergence (possibly) caused by automatic mesh refinement"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;\/p&gt;&lt;p&gt;I am running a VOF simulation where the free surface is refined using automatic mesh refinement, but the simulation is suddenly diverging after about 1000 iterations.&nbsp; When inspecting the results after divergence, I see no obious signs of high velocities, residuals, etc.&nbsp; I have noticed that the original mesh had a minimum orthogonal quality of &gt; 0.1, but when checking the mesh after divergence, the minimum orthogonal quality is ~0.03, eventhough I specify a minimum quality of 0.1 in the automatic mesh settings&lt;\/p&gt;&lt;p&gt;Original mesh quality check using Fluent meshing:&lt;\/p&gt;&lt;p style=&#8221;margin: 0in; font-family: &#8216;Cascadia Code&#8217;; font-size: 14.0pt;&#8221;&gt;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&lt;\/p&gt;&lt;p style=&#8221;margin: 0in; font-family: &#8216;Cascadia Code&#8217;; font-size: 14.0pt;&#8221;&gt;Cell Quality [Measure : Orthogonal]&lt;\/p&gt;&lt;p style=&#8221;margin: 0in; font-family: &#8216;Cascadia Code&#8217;; font-size: 14.0pt;&#8221;&gt;Minimum = 0.10208334, Maximum = 1, Average = 0.95636215.&lt;\/p&gt;&lt;p style=&#8221;margin: 0in; font-family: &#8216;Cascadia Code&#8217;; font-size: 14.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p style=&#8221;margin: 0in; font-family: &#8216;Cascadia Code&#8217;; font-size: 14.0pt;&#8221;&gt;Marking Cells in Range (0.10208334 0.15208334)&#8230;&lt;\/p&gt;&lt;p style=&#8221;margin: 0in; font-family: &#8216;Cascadia Code&#8217;; font-size: 14.0pt;&#8221;&gt;Info: Total marked entities in the range is 252, is limited to 15 by max number of allowable cell clusters (10).&lt;\/p&gt;&lt;p style=&#8221;margin: 0in; font-family: &#8216;Cascadia Code&#8217;; font-size: 14.0pt;&#8221;&gt;&#8212;&#8212;&#8212;&#8212;&#8212; &#8212;&#8212;&#8212;-&lt;\/p&gt;&lt;p style=&#8221;margin: 0in; font-family: &#8216;Cascadia Code&#8217;; font-size: 14.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;Mesh quality after automatic mesh adaption and divergence:&lt;\/p&gt;&lt;p style=&#8221;margin: 0in; font-family: &#8216;Cascadia Code&#8217;; font-size: 14.0pt;&#8221;&gt;Minimum Orthogonal Quality =&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;3.18312e-02 cell 301147 on zone 19062 (ID: 14520292 on partition: 39) at location ( 5.99704e+00,&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;2.32079e+00,&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;9.54323e-01)&lt;\/p&gt;&lt;p style=&#8221;margin: 0in; font-family: &#8216;Cascadia Code&#8217;; font-size: 14.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p style=&#8221;margin: 0in; font-family: &#8216;Cascadia Code&#8217;; font-size: 14.0pt;&#8221;&gt;Maximum Aspect Ratio =&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;1.05687e+02 cell 31803 on zone 19062 (ID: 21173019 on partition: 58) at location (-5.25139e+00,&lt;span style=&#8221;mso-spacerun: yes;&#8221;&gt;&nbsp; &lt;\/span&gt;5.40401e-03, -1.74540e+00)&lt;\/p&gt;&lt;p style=&#8221;margin: 0in; font-family: &#8216;Cascadia Code&#8217;; font-size: 14.0pt;&#8221;&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;I checked the location of the poor quality cell, and it seems to be on the water surface in a very turbulent part of the domain.&lt;\/p&gt;&lt;p&gt;Any suggestions on how to correct?&lt;\/p&gt;&lt;p&gt;I have also tried with the &#8220;prismatic adaption&#8221; option selected, since my mesh does include solid boundaries with prism layers, but then I get an error after a while when the mesh is updating:&lt;\/p&gt;&lt;p&gt;eversed flow on 9748 faces of pressure-inlet 169.&lt;br&gt;&nbsp; &nbsp;419 &nbsp;3.2815e-02 &nbsp;1.0527e-05 &nbsp;1.1973e-05 &nbsp;1.0660e-05 &nbsp;5.2760e-03 &nbsp;2.2468e-03 &nbsp;1.3402e-03 16:27:52 1428&lt;br&gt;terminate called after throwing an instance of &#8216;std::runtime_error'&lt;br&gt;&nbsp; what(): &nbsp;&lt;br&gt;&nbsp;~~~~~~~~~~~~~~~~~ adapt::BaseMesh&lt;Mesh&gt;::initAnisotropyIndex ~~~~~~~~~~~~~~~~~&nbsp;&lt;br&gt;&nbsp;Failed to find initial opposing face!&lt;br&gt;&nbsp;Partition: 23&lt;br&gt;&nbsp;Cell: 57430832 :: polyhedra&lt;br&gt;&nbsp;n: 23&nbsp;&lt;br&gt;&nbsp;(&lt;br&gt;&nbsp; &nbsp;15529381 :: [2.9153029462865616e+00 2.3716788569593583e+00 1.6824858095966990e+00] {0 0 0}&lt;br&gt;&nbsp; &nbsp;80488568 :: [2.9106995584188318e+00 2.3745322681973411e+00 1.6805485417735193e+00] {1 1 0}&lt;br&gt;&nbsp; &nbsp;80494791 :: [2.9061045061794402e+00 2.3658542722152580e+00 1.6786988298365557e+00] {1 1 0}&lt;br&gt;&nbsp; &nbsp;80488567 :: [2.9152345834174480e+00 2.3657246637854894e+00 1.6824554668049947e+00] {1 1 0}&lt;br&gt;&nbsp; &nbsp;15613312 :: [2.9159362300134335e+00 2.3716575584291846e+00 1.6810281321082341e+00] {0 0 0}&lt;br&gt;&nbsp; &nbsp;80490989 :: [2.9113164176483997e+00 2.3745323495270014e+00 1.6790830094844111e+00] {1 1 0}&lt;br&gt;&nbsp; &nbsp;15613311 :: [2.9066966052833663e+00 2.3774071406248183e+00 1.6771378868605882e+00] {0 0 0}&lt;br&gt;&nbsp; &nbsp;15529382 :: [2.9060961705511019e+00 2.3773856794353234e+00 1.6786112739503398e+00] {0 0 0}&lt;br&gt;&nbsp; &nbsp;80483965 :: [2.9158685012458170e+00 2.3657247741517073e+00 1.6809977345199560e+00] {1 1 0}&lt;br&gt;&nbsp; &nbsp;80497194 :: [2.9067040720456472e+00 2.3658543707577904e+00 1.6772248331972825e+00] {1 1 0}&lt;br&gt;&nbsp; &nbsp;80484233 :: [2.9015706020637895e+00 2.3746897130562958e+00 1.6768320751483961e+00] {1 1 0}&lt;br&gt;&nbsp; &nbsp;15529378 :: [2.8970450335764766e+00 2.3719937466772683e+00 1.6750528763464525e+00] {0 0 0}&lt;br&gt;&nbsp; &nbsp;80482367 :: [2.8973272284199449e+00 2.3719830136342814e+00 1.6743076450496202e+00] {1 0 1}&lt;br&gt;&nbsp; &nbsp;15613309 :: [2.8976094232634138e+00 2.3719722805912951e+00 1.6735624137527880e+00] {0 0 0}&lt;br&gt;&nbsp; &nbsp;80484232 :: [2.9021530142733898e+00 2.3746897106080569e+00 1.6753501503066881e+00] {1 1 0}&lt;br&gt;&nbsp; &nbsp;80482368 :: [2.8969545548016358e+00 2.3660065670793218e+00 1.6750180659789646e+00] {1 1 0}&lt;br&gt;&nbsp; &nbsp;80492263 :: [2.8972370967829035e+00 2.3660065940075339e+00 1.6742729815503528e+00] {1 1 1}&lt;br&gt;&nbsp; &nbsp;80482366 :: [2.8975196387641713e+00 2.3660066209357464e+00 1.6735278971217413e+00] {1 1 0}&lt;br&gt;&nbsp; &nbsp;15529384 :: [2.9151662205483344e+00 2.3597704706116205e+00 1.6824251240132906e+00] {0 0 0}&lt;br&gt;&nbsp; &nbsp;80488570 :: [2.9106846554077928e+00 2.3570451476708385e+00 1.6805391448585016e+00] {1 1 0}&lt;br&gt;&nbsp; &nbsp;15613313 :: [2.9158007724782009e+00 2.3597919898742297e+00 1.6809673369316780e+00] {0 0 0}&lt;br&gt;&nbsp; &nbsp;91869905 :: [2.9109930734626674e+00 2.3570451804965211e+00 1.6798060974676075e+00] {1 1 1}&lt;br&gt;&nbsp; &nbsp;80488838 :: [2.9113014915175417e+00 2.3570452133222037e+00 1.6790730500767130e+00] {1 1 0}&lt;br&gt;&nbsp;) {0 0 0} &lt;0&gt; [ Old Active Anisotropic ]&lt;br&gt;&nbsp;f: 17&nbsp;&lt;br&gt;&nbsp;(&#8230;&lt;\/p&gt;&lt;p&gt;I am running a steady state simulation using the following:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/04-09-2024-1725466324-mceclip1.png\" \/>&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/04-09-2024-1725466947-mceclip2.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-381558","topic","type-topic","status-publish","hentry","topic-tag-adaptivemesh-1","topic-tag-ansys-fluent","topic-tag-vof"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi,I am running a VOF simulation where the free surface is refined using automatic mesh refinement, but the simulation is suddenly diverging after about 1000 iterations. 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When inspecting the results after divergence, I see no obious signs of high velocities, residuals, etc. I have noticed that the original mesh had a minimum orthogonal quality of","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/divergence-possibly-caused-by-automatic-mesh-refinement\/#breadcrumblist"},"datePublished":"2024-09-04T16:23:00+00:00","dateModified":"2024-09-04T16:23:00+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/forum\/#website","url":"https:\/\/innovationspace.ansys.com\/forum\/","name":"Ansys Learning Forum","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Divergence (possibly) caused by automatic mesh refinement | Ansys Learning Forum","og:description":"Hi,I am running a VOF simulation where the free surface is refined using automatic mesh refinement, but the simulation is suddenly diverging after about 1000 iterations. When inspecting the results after divergence, I see no obious signs of high velocities, residuals, etc. I have noticed that the original mesh had a minimum orthogonal quality of","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/divergence-possibly-caused-by-automatic-mesh-refinement\/","og:image":"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/04-09-2024-1725466324-mceclip1.png","og:image:secure_url":"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/04-09-2024-1725466324-mceclip1.png","article:published_time":"2024-09-04T16:23:00+00:00","article:modified_time":"2024-09-04T16:23:00+00:00","twitter:card":"summary_large_image","twitter:title":"Divergence (possibly) caused by automatic mesh refinement | Ansys Learning Forum","twitter:description":"Hi,I am running a VOF simulation where the free surface is refined using automatic mesh refinement, but the simulation is suddenly diverging after about 1000 iterations. When inspecting the results after divergence, I see no obious signs of high velocities, residuals, etc. I have noticed that the original mesh had a minimum orthogonal quality of","twitter:image":"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/04-09-2024-1725466324-mceclip1.png"},"aioseo_meta_data":{"post_id":"381558","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"content","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":true,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"created":"2024-10-28 16:30:17","updated":"2026-09-16 23:37:08","ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/vof\/\" title=\"vof\">vof<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tDivergence (possibly) caused by automatic mesh refinement\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/forum"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/forum\/topics\/"},{"label":"vof","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/vof\/"},{"label":"Divergence (possibly) caused by automatic mesh refinement","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/divergence-possibly-caused-by-automatic-mesh-refinement\/"}],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["41072","13659","199"],"_bbp_author_ip":["199.253.110.1"],"_btv_view_count":["444"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["381558"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","13659","41072"],"_bbp_voice_count":["3"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["381942"],"_bbp_last_active_id":["381942"],"_bbp_last_active_time":["2024-09-09 10:22:47"]},"test":"marc-goldbachxylem-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/381558","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\/381558\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=381558"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}