{"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":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Species volume fraction can be evaluated from its mass fraction value using the following expression via custom-field-functions: volume-fraction of species &quot;i&quot; = (mass-fraction of species &quot;i&quot;)*(mixture-density)\/(density of species &quot;i&quot;) Note that the mixture-density is directly available under the 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