{"id":353460,"date":"2024-02-23T12:32:08","date_gmt":"2024-02-23T12:32:08","guid":{"rendered":"\/forum\/?post_type=topic&#038;p=353460"},"modified":"2024-02-23T12:32:08","modified_gmt":"2024-02-23T12:32:08","slug":"multiphase-model-doesnt-give-good-results","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/multiphase-model-doesnt-give-good-results\/","title":{"rendered":"Multiphase model doesn&#8217;t give good results"},"content":{"rendered":"<p>Hello everyone,<\/p>\n<p>I am running a steady state simulation of a fluid flowing inside a small tube within a bigger tube and I am using a multiphase model with the following settings:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/02\/23-02-2024-1708690307-mceclip0.png\" width=\"397\" height=\"428\"><\/p>\n<p>As boundary conditions I have got for the secondary phase volume fraction = 1 at the inlet of the small tube and volume fraction = 0 at the inlet of the bigger tube.<\/p>\n<p>After running my simulation, even if the residuals seem to have reached convergence it looks like my fluid never reached the end of the small tube:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/02\/23-02-2024-1708690861-mceclip0.png\" width=\"685\" height=\"316\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/02\/23-02-2024-1708691007-mceclip1.png\" width=\"636\" height=\"282\"><\/p>\n<p>If I run my simulation even just for 10 additional iterations, the contour is already looking better:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/02\/23-02-2024-1708691124-mceclip2.png\" width=\"652\" height=\"292\"><\/p>\n<p>I was wondering why I don&#8217;t achieve this result after running more than 1000 iterations but I do with just a few iterations?<\/p>\n<p>These are the solution settings that I am using which I think are the recommended ones for steady state multiphase simulations:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/02\/23-02-2024-1708691212-mceclip3.png\" width=\"340\" height=\"728\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/02\/23-02-2024-1708691275-mceclip4.png\"><\/p>\n<p>I am not sure what I am doing wrong and what I am missing<\/p>\n<p>Thank you!<\/p>\n","protected":false},"template":"","class_list":["post-353460","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["23.206.193.59"],"_bbp_subscription":["261033","199"],"_btv_view_count":["521"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["353460"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","261033"],"_bbp_voice_count":["2"],"_bbp_reply_count":["15"],"_bbp_last_reply_id":["356385"],"_bbp_last_active_id":["356385"],"_bbp_last_active_time":["2024-03-11 13:59:41"]},"test":"3831efb3fcdd393755e6579984b42ad9059c6826"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/353460","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/353460\/revisions"}],"predecessor-version":[{"id":353466,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/353460\/revisions\/353466"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=353460"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}