{"id":157333,"date":"2022-06-06T08:33:36","date_gmt":"2022-06-06T08:33:36","guid":{"rendered":"\/knowledge\/forums\/topic\/how-can-volume-fraction-be-plotted-in-a-species-transport-simulation-2\/"},"modified":"2022-06-06T08:33:36","modified_gmt":"2022-06-06T08:33:36","slug":"how-can-volume-fraction-be-plotted-in-a-species-transport-simulation-2","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-volume-fraction-be-plotted-in-a-species-transport-simulation-2\/","title":{"rendered":"How can volume fraction be plotted in a species transport simulation?"},"content":{"rendered":"<p>Species volume fraction can be evaluated from its mass fraction value using the following expression via custom-field-functions:  <br \/>volume-fraction of species &#8220;i&#8221; = (mass-fraction of species &#8220;i&#8221;)*(mixture-density)\/(density of species &#8220;i&#8221;)  <br \/>Note that the mixture-density is directly available under the field-function &#8220;Density&#8230;&#8221; Species &#8220;i&#8221; density is not directly available as a field variable and can be provided as a constant value\/state function\/ideal gas law using a custom-field-function.  Sample journal command to create a custom-field-function to evaluate water-vapor (h2o) volume fraction are as below. Here, h2o_density is also a custom-field-function assigning it a constant value of 1.3 [kg\/m3] and is used in the volume-fraction expression. <br \/>define custom-field-functions <br \/>define &#8220;h2o_density&#8221; &#8220;1.3&#8221; define custom-field-functions define &#8220;vol-frac-h2o&#8221; &#8220;h2o*density\/h2o_density&#8221;<\/p>\n","protected":false},"template":"","class_list":["post-157333","topic","type-topic","status-publish","hentry","topic-tag-ansys-fluent","topic-tag-multiphase","topic-tag-species-transport"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["06-06-2022 20:20"],"_bbp_forum_id":["27784"],"_btv_view_count":["4939"],"_bbp_likes_count":["0"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/157333","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\/157333\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=157333"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}