{"id":161813,"date":"2023-01-25T07:17:01","date_gmt":"2023-01-25T07:17:01","guid":{"rendered":"\/knowledge\/forums\/topic\/how-can-phasic-mass-fraction-be-calculated-in-a-multiphase-simulation\/"},"modified":"2023-07-31T12:35:56","modified_gmt":"2023-07-31T12:35:56","slug":"how-can-phasic-mass-fraction-be-calculated-in-a-multiphase-simulation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-phasic-mass-fraction-be-calculated-in-a-multiphase-simulation\/","title":{"rendered":"How can phasic mass fraction be calculated in a multiphase simulation?"},"content":{"rendered":"<p>Mass fraction of phase-i can be evaluated using the following expression via custom-field-function: mass fraction of phase-i = (phase-i volume fraction)*(phase-i density)\/(mixture-density) &#8230; Eq. (1) where mixture-density is another predefined custom-field-function as mixture-density = sum of [(phase-i volume fraction)*(phase-i density)] for all the phases &#8220;i&#8221; in the domain  For example, in a two-phase simulation: mixture-density = (phase-1 volume fraction * phase-1 density) + (phase-2 volume fraction * phase-2 density) mass fraction of phase-2 = (phase-2 volume fraction)*(phase-2 density)\/(mixture-density)  Note: To evaluate the average mass fraction of a phase across a flow boundary, it can be obtained using: mass fraction of phase-i = (mass flow rate of phase-i\/mixture mass flow rate) &#8230; Eq. (2)  At a flow boundary, the mass-weighted average of the mass fraction values obtained using Eq.(1) will be nearly equal to that obtained using Eq.(2) if the interphase slip is negligible.<\/p>\n","protected":false},"template":"","class_list":["post-161813","topic","type-topic","status-publish","hentry","topic-tag-2019-r1","topic-tag-fluent","topic-tag-fluid-dynamics","topic-tag-mp-eulerian-mp-flow","topic-tag-multiphase","topic-tag-scripting-journaling-udf"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_forum_id":["27809"],"_bbp_author_ip":["23.56.168.180"],"_bbp_last_active_time":["1-24-2023  20:20:13"],"_btv_view_count":["1259"],"siebel_km_number":["2058184"],"product_version":["2019 R1"],"km_published_date":["2019-02-08T19:00:55.000Z"],"family":["Fluid Dynamics"],"application_name":["FLUENT"],"_edit_lock":["1705065695:2"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/161813","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\/161813\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=161813"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}