{"id":171091,"date":"2023-06-05T07:05:41","date_gmt":"2023-06-05T07:05:41","guid":{"rendered":"\/knowledge\/forums\/topic\/how-to-calculate-the-positive-or-negative-mass-flow-rate-through-an-arbitrary-plane-in-cfd-post\/"},"modified":"2023-07-31T12:30:01","modified_gmt":"2023-07-31T12:30:01","slug":"how-to-calculate-the-positive-or-negative-mass-flow-rate-through-an-arbitrary-plane-in-cfd-post","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-to-calculate-the-positive-or-negative-mass-flow-rate-through-an-arbitrary-plane-in-cfd-post\/","title":{"rendered":"How to calculate the positive or negative mass flow rate through an arbitrary plane in CFD Post?"},"content":{"rendered":"<p>Just us following expressions to sum up the positive or negative mass flow rates through the cells of an arbitrary plane with name &#8220;Surface&#8221;:  Positive mass flow rate: areaInt(max(0.0[m\/s],Velocity u * Normal X + Velocity v * Normal Y + Velocity w * Normal Z)*Density)@Surface  Negative mass flow rate: areaInt(min(0.0[m\/s],Velocity u * Normal X + Velocity v * Normal Y + Velocity w * Normal Z)*Density)@Surface<\/p>\n","protected":false},"template":"","class_list":["post-171091","topic","type-topic","status-publish","hentry","topic-tag-cfd-post","topic-tag-fluid-dynamics","topic-tag-general"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["2\/6\/2023 20:20"],"_bbp_forum_id":["27796"],"_bbp_author_ip":["209.182.204.162"],"_btv_view_count":["1740"],"siebel_km_number":["2039609"],"product_version":[""],"km_published_date":["2015-07-02T00:00:00.000Z"],"family":["Fluid Dynamics"],"application_name":["CFD-Post"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/171091","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/171091\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=171091"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}