{"id":43958,"date":"2020-05-13T18:51:07","date_gmt":"2020-05-13T18:51:07","guid":{"rendered":"\/forum\/forums\/topic\/residuals-in-combustion-simulation\/"},"modified":"2020-05-13T18:51:07","modified_gmt":"2020-05-13T18:51:07","slug":"residuals-in-combustion-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/residuals-in-combustion-simulation\/","title":{"rendered":"residuals in combustion simulation"},"content":{"rendered":"<p>please let me know if this kind of residual plot showing fluctuations good&#8230; when to consider the solution to converge if such fluctuations keep on going&#8230;.species transport with eddy dissipation concept and standard k-epsilon turbulence model with no convergence criteria and second order upwind scheme with under relaxation factor between 0.8 and 0.9<\/p>\n<p><\/p>\n<p>mesh quality&nbsp;<\/p>\n<p><\/p>\n<p>Minimum Orthogonal Quality =&nbsp; 6.33128e-01<\/p>\n<p><\/p>\n<p>Maximum Aspect Ratio =&nbsp; 5.34101e+00<\/p>\n<p><\/p>\n<p>the jumps in between are due to change from first order to second order scheme.<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>Also i want to know whether its necessary to patch to start ignition. in my case the combustion starts without patching. its a premixed H2-air combustion using species transport.<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>please help<\/p>\n<p><\/p>\n<p>thanks in advance.&nbsp;<\/p>\n<p><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/8cae0c0e-b6f1-4002-b8b5-aad1004a92c3\/a567463c-c861-479a-bc74-abba0134c719_mesh-facesplit-6-18000.jpg?width=690&amp;upscale=false\" alt=\"\" width=\"458\" height=\"344\"><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-43958","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["16139"],"_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":["482"],"_bbp_subscription":["243158"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["43958"],"_bbp_forum_id":["27792"],"_bbp_engagement":["168724"],"_bbp_voice_count":["1"],"_bbp_reply_count":["0"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["43958"],"_bbp_last_active_time":["2020-05-13 18:51:07"]},"test":"micro"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/43958","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\/43958\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=43958"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}