{"id":42170,"date":"2020-03-28T12:19:35","date_gmt":"2020-03-28T12:19:35","guid":{"rendered":"\/forum\/forums\/topic\/error-fluent-solver-floating-point-exception-divergence-detected\/"},"modified":"2020-03-28T12:19:35","modified_gmt":"2020-03-28T12:19:35","slug":"error-fluent-solver-floating-point-exception-divergence-detected","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/error-fluent-solver-floating-point-exception-divergence-detected\/","title":{"rendered":"Error &#8211; Fluent solver &#8211; Floating point exception &#8211; Divergence detected"},"content":{"rendered":"<p>When I tried creating solidification\/melting model for phase change materials(PCMs) , I ended up with following error message&nbsp;<\/p>\n<p><\/p>\n<p>Boundary conditions used:<\/p>\n<p><\/p>\n<p>1. Inlet &#8211; Mass-flow inlet &#8211; 3kg\/s, Temp &#8211; 363K<\/p>\n<p><\/p>\n<p>2. outlet &#8211; pressure outlet &#8211; 101325 pa (gauge pressure)<\/p>\n<p><\/p>\n<p>Material property:<\/p>\n<p><\/p>\n<p>1. PCM solidus temp, liquidus temp : 494 K, 511K<\/p>\n<p><\/p>\n<p>2. Water: Fluent default<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>Error message:<\/p>\n<p><\/p>\n<p>ter continuity x-velocity y-velocity z-velocity energy time\/iter<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">32 1.7098e+09 4.6928e-01 1.8290e-01 3.1616e-01 1.6942e-04 0:00:12 1<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Stabilizing temperature to enhance linear solver robustness.<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Stabilizing temperature using GMRES to enhance linear solver robustness.<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">temperature limited to 1.000000e+00 in 1013 cells on zone 7 in domain 1<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">temperature limited to 5.000000e+03 in 5428 cells on zone 7 in domain 1<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">temperature limited to 1.000000e+00 in 23995 cells on zone 6 in domain 1<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">temperature limited to 5.000000e+03 in 38774 cells on zone 6 in domain 1<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Reversed flow on 67 faces (67.6% area) of pressure-outlet 10.<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">(update-animation-object &#8220;animation-1&#8221;)()<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Flow time = 33s, time step = 33<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">167 more time steps<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Updating solution at time level N&#8230;<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">done.<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">iter continuity x-velocity y-velocity z-velocity energy time\/iter<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">33 2.4241e+11 4.9479e-01 1.9709e-01 2.6575e-01 1.5073e-01 0:14<img decoding=\"async\" src=\"\/content\/images\/emoticons\/curly-lips-emoticon.png\" alt=\"\" class=\"emoticon\" \/>2 1<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">&nbsp;<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Stabilizing x-momentum to enhance linear solver robustness.<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Stabilizing temperature to enhance linear solver robustness.<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Stabilizing temperature using GMRES to enhance linear solver robustness.<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Divergence detected in AMG solver: temperature<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Reversed flow on 52 faces (53.6% area) of pressure-outlet 10.<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\"><strong>Divergence detected in AMG solver: temperature<\/strong><\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Error at host: floating point exception<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Error at Node 0: floating point exception<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Error at Node 1: floating point exception<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Error at Node 2: floating point exception<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Error at Node 3: floating point exception<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Compute processes interrupted. Processing can be resumed.<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\"><span style=\"color: #ff0000;\">Error: floating point exception<\/span><\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Calculation complete.<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">&nbsp;<\/p>\n<p><\/p>\n<p style=\"-qt-block-indent: 0; text-indent: 0px; margin: 0px;\">Attached images showing Liquid &#8211; fraction of PCM balls<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p style=\"-qt-paragraph-type: empty; -qt-block-indent: 0; text-indent: 0px; margin: 0px;\"><u><\/u><\/p>\n","protected":false},"template":"","class_list":["post-42170","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["14350"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["2354"],"_bbp_subscription":["248627"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["42170"],"_bbp_forum_id":["27792"],"_bbp_engagement":["118","199","174405"],"_bbp_voice_count":["3"],"_bbp_reply_count":["5"],"_bbp_last_reply_id":["109862"],"_bbp_last_active_id":["109862"],"_bbp_last_active_time":["2020-04-02 07:46:35"]},"test":"nagasudhan"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/42170","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\/42170\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=42170"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}