{"id":38129,"date":"2019-10-04T20:03:39","date_gmt":"2019-10-04T20:03:39","guid":{"rendered":"\/forum\/forums\/topic\/how-is-mass-imbalance-evaluated-at-each-cell\/"},"modified":"2019-10-04T20:03:39","modified_gmt":"2019-10-04T20:03:39","slug":"how-is-mass-imbalance-evaluated-at-each-cell","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-is-mass-imbalance-evaluated-at-each-cell\/","title":{"rendered":"How is mass imbalance evaluated at each cell?"},"content":{"rendered":"<p>Hello,<\/p>\n<p><\/p>\n<p>I have a steady-state solution of a pressure-based, k-omega realizable 3D simulation.<\/p>\n<p><\/p>\n<p>I would like to verify my UDF which calculates mass flow over an arbitrary surface composed by a specified&nbsp;group of cells in the fluid domain.<\/p>\n<p><\/p>\n<p>As a starter, I&#8217;m trying to compare my values when I loop over the faces in every cell to the cell-centered mass imbalance value that I exported from the original solution.<\/p>\n<p><\/p>\n<p>However, the mass flow values at the interface of each cell I get are currently about&nbsp;7 or 8 magnitudes higher than what I get from mass imbalance values in Fluent.<\/p>\n<p><\/p>\n<p>I am curious how exactly mass imbalance is calculated at each cell; is it taken from surface integration, or is it interpolated from the node values.<\/p>\n<p><\/p>\n<p>Also, I&#8217;d like to know how I can replicate these mass imbalance values in my calculation post-solve.<\/p>\n<p><\/p>\n<p>Please advice. Thanks!<\/p>\n","protected":false},"template":"","class_list":["post-38129","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["10307"],"_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":["3318"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["38129"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","163620"],"_bbp_voice_count":["3"],"_bbp_reply_count":["14"],"_bbp_last_reply_id":["99361"],"_bbp_last_active_id":["99361"],"_bbp_last_active_time":["2019-11-27 07:32:24"]},"test":"lslxao"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/38129","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\/38129\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=38129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}