{"id":389350,"date":"2024-10-12T05:54:12","date_gmt":"2024-10-12T05:54:12","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/handling-solid-volume-fraction-in-gas-solid-reaction-in-ansys-fluent\/"},"modified":"2024-10-12T05:54:12","modified_gmt":"2024-10-12T05:54:12","slug":"handling-solid-volume-fraction-in-gas-solid-reaction-in-ansys-fluent","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/handling-solid-volume-fraction-in-gas-solid-reaction-in-ansys-fluent\/","title":{"rendered":"Handling Solid Volume Fraction in Gas-Solid Reaction in ANSYS Fluent"},"content":{"rendered":"<p>&lt;p&gt;Hi everyone,&lt;\/p&gt;&lt;p&gt;I&rsquo;m currently modeling a <strong>Eulerian-Eulerian gas-solid reaction<\/strong> (heterogeneous mechanism without UDF) in ANSYS Fluent, similar to the reactions shown in the attached image, where the <strong>solid volume fraction (&lt;span class=&#8221;katex&#8221;&gt;&lt;span class=&#8221;katex-mathml&#8221;&gt;\u03f5s\\epsilon_s&lt;\/span&gt;&lt;span class=&#8221;katex-html&#8221; aria-hidden=&#8221;true&#8221;&gt;&lt;span class=&#8221;base&#8221;&gt;&lt;span class=&#8221;mord&#8221;&gt;&lt;span class=&#8221;mord mathnormal&#8221;&gt;\u03f5&lt;\/span&gt;&lt;span class=&#8221;msupsub&#8221;&gt;&lt;span class=&#8221;vlist-t vlist-t2&#8243;&gt;&lt;span class=&#8221;vlist-r&#8221;&gt;&lt;span class=&#8221;vlist&#8221;&gt;&lt;span class=&#8221;sizing reset-size6 size3 mtight&#8221;&gt;&lt;span class=&#8221;mord mathnormal mtight&#8221;&gt;s&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;span class=&#8221;vlist-s&#8221;&gt;\u200b&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;)<\/strong> is part of the reaction rate equation.&lt;\/p&gt;&lt;p&gt;In Fluent, I used the <strong>Arrhenius equation<\/strong> for the reaction rate, but I did not include a UDF for the solid volume fraction (&lt;span class=&#8221;katex&#8221;&gt;&lt;span class=&#8221;katex-mathml&#8221;&gt;\u03f5s\\epsilon_s&lt;\/span&gt;&lt;span class=&#8221;katex-html&#8221; aria-hidden=&#8221;true&#8221;&gt;&lt;span class=&#8221;base&#8221;&gt;&lt;span class=&#8221;mord&#8221;&gt;&lt;span class=&#8221;mord mathnormal&#8221;&gt;\u03f5&lt;\/span&gt;&lt;span class=&#8221;msupsub&#8221;&gt;&lt;span class=&#8221;vlist-t vlist-t2&#8243;&gt;&lt;span class=&#8221;vlist-r&#8221;&gt;&lt;span class=&#8221;vlist&#8221;&gt;&lt;span class=&#8221;sizing reset-size6 size3 mtight&#8221;&gt;&lt;span class=&#8221;mord mathnormal mtight&#8221;&gt;s&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;span class=&#8221;vlist-s&#8221;&gt;\u200b&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;). Instead, I simply <strong>patched the solid volume fraction<\/strong> in the simulation.&lt;\/p&gt;&lt;p&gt;My question is:&lt;\/p&gt;<\/p>\n<ul>\n<li><strong>Is this the right approach?<\/strong> How does Fluent handle gas-solid reactions and the solid volume fraction if it&#8217;s not explicitly defined in a UDF?<\/li>\n<li><strong>Will Fluent automatically account for the solid volume fraction in the reaction rate<\/strong>, or should I have included it through a UDF?<\/li>\n<\/ul>\n<p>&lt;p&gt;The results are in good agreement with experimental observations, but I&rsquo;d like to confirm the validity of my approach. If possible, could you please provide any <strong>references from the ANSYS User Guide<\/strong> or other sources to support your response?&lt;\/p&gt;&lt;p&gt;Thanks in advance for your help!&lt;\/p&gt;&lt;p&gt;&lt;span class=&#8221;katex-display&#8221;&gt;&lt;span class=&#8221;katex&#8221;&gt;&lt;span class=&#8221;katex-html&#8221; aria-hidden=&#8221;true&#8221;&gt;&lt;span class=&#8221;base&#8221;&gt;&lt;span class=&#8221;mord&#8221;&gt;&lt;span class=&#8221;msupsub&#8221;&gt;&lt;span class=&#8221;vlist-t vlist-t2&#8243;&gt;&lt;span class=&#8221;vlist-r&#8221;&gt;&lt;span class=&#8221;vlist-s&#8221;&gt;<strong>&lt;span class=&#8221;katex-mathml&#8221;&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/12-10-2024-1728711696-Capture.PNG\" alt=\"\" \/>&lt;\/span&gt;<\/strong>&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/span&gt;&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-389350","topic","type-topic","status-publish","hentry","topic-tag-eulerian-eulerian-model-1","topic-tag-fluent","topic-tag-fluid-solid-interaction-1","topic-tag-heterogeneous-reaction","topic-tag-patching"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi everyone,I\u2019m currently modeling a Eulerian-Eulerian gas-solid reaction (heterogeneous mechanism without UDF) in ANSYS Fluent, similar to the reactions shown in the attached image, where the solid volume fraction (\u03f5s\\epsilon_s\u03f5s\u200b) is part of the\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" 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