{"id":166935,"date":"2022-03-03T09:39:37","date_gmt":"2022-03-03T09:39:37","guid":{"rendered":"\/forum\/forums\/topic\/mass-balance-vof\/"},"modified":"2022-03-04T13:24:14","modified_gmt":"2022-03-04T13:24:14","slug":"mass-balance-vof","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mass-balance-vof\/","title":{"rendered":"Mass balance VOF"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hi,<\/p>\n<p>I&#039;m simulating a t-junction where i have a pressure outlet, and two velocity inlets (left side of junction = air, down side = water). I&#039;m simulating water entering from the vertical junction, with the domain inital being filled with air. The simulations are done transient. Now, as water is being filled I&#039;m monitoring the Mass Balance, but it the results i get are not in balance. The mass flows are as follows: <\/p>\n<p>Velocity inlet_air = 2.45 <\/p>\n<p>Pressure inlet_rightside = -2.466<\/p>\n<p>velocity inlet_water = 13.309<\/p>\n<p>Now, the water is &quot;growing&quot; through the domain but is not near of reaching the outlet. <\/p>\n<p>The questions are the following:<\/p>\n<ul>\n<li>How do i evaluate the mass balance \/ imbalance in a VOF transient simulation as this? <\/li>\n<li>Is the difference between the velocity inlet_air and the pressure inlet, due to the mass flow from the water injection ? If so, why is it so small when comparing it to the water inflow? <\/li>\n<li>Is it possible to evaluate mass balance when both phases are not in contact with the pressure outlet? <\/li>\n<\/ul>\n<p><\/p>\n","protected":false},"template":"","class_list":["post-166935","topic","type-topic","status-closed","hentry","topic-tag-convergence","topic-tag-imbalance-1","topic-tag-massbalance-1","topic-tag-multiphase","topic-tag-vof"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["821"],"_bbp_likes_count":["0"],"_bbp_subscription":["246355"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["166935"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","246355"],"_bbp_voice_count":["2"],"_bbp_reply_count":["7"],"_bbp_last_reply_id":["207251"],"_bbp_last_active_id":["207251"],"_bbp_last_active_time":["2022-03-04 13:24:14"]},"test":"preben-svartvatngmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/166935","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\/166935\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=166935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}