{"id":295499,"date":"2023-07-30T16:19:28","date_gmt":"2023-07-30T16:19:28","guid":{"rendered":"\/forum\/forums\/topic\/reverse-flow-problem\/"},"modified":"2023-07-30T16:22:08","modified_gmt":"2023-07-30T16:22:08","slug":"reverse-flow-problem","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/reverse-flow-problem\/","title":{"rendered":"Reverse flow problem"},"content":{"rendered":"<p>Hello everyone.<br \/>I have a huge backflow problem in my case.<br \/>I am considering flow through a cube (I made a 2d model because 3d didn&#8217;t work but it didn&#8217;t solve the problem).<br \/>My boundary conditions: 0.01 m\/s velocity inlet and default pressure outlet. Two-phase flow (mixture or VOF), with gravity on. Unfortunately, as shown in the picture, I have a strong reverse flow, which gives non-physical results &#8211; because the inlet velocity is 0.01 m\/s and the reverse flow is 0.6 m\/s (I can&#8217;t increase the velocity inlet)<br \/>I&#8217;ve tried extending the outlet, fine-tuning the mesh, setting a different operational density, but nothing works. Unfortunately, I have no idea what I can do and this is an important problem for me. (With gravity off, no problem.) It is interesting that gravity &#8220;destroys&#8221; the model even when the pressure values of my substance are constant.<br \/>Has anyone encountered such a problem? the continuity equation does not converge (i try hybrid and standard initialzation).&nbsp;<\/p>\n<p><a href=\"https:\/\/drive.google.com\/drive\/folders\/13e37e40V74l0dty0HNNc4sTRYqqp6WtZ?usp=sharing\">https:\/\/drive.google.com\/drive\/folders\/13e37e40V74l0dty0HNNc4sTRYqqp6WtZ?usp=sharing<\/a><\/p>\n<p>It gives a google drive link with a link (case and wbpj file) , could any of you help me? In the future I will have much more complicated geometry, so I need to refine this model so that I don&#8217;t have the same problems later.<br \/>Please help.<a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/30-07-2023-1690733088-an1.png\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/07\/30-07-2023-1690733088-an1.png\" alt=\"\"><\/a><\/p>\n","protected":false},"template":"","class_list":["post-295499","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["9133","218","15180","199"],"_bbp_author_ip":["23.206.193.146"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["4128"],"_edit_lock":["1690734079:225835"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["295499"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","218","9133","15180"],"_bbp_voice_count":["4"],"_bbp_reply_count":["24"],"_bbp_last_reply_id":["295888"],"_bbp_last_active_id":["295888"],"_bbp_last_active_time":["2023-08-01 11:04:04"]},"test":"c4694a3b4f2994f76f3f9a7a1976b083116366ea"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/295499","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\/295499\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=295499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}