{"id":167082,"date":"2023-04-05T14:32:50","date_gmt":"2023-04-05T14:32:50","guid":{"rendered":"\/knowledge\/forums\/topic\/i-am-running-fluent-non-reacting-case-with-the-edc-model-active-edc-model-option-is-turned-on-but-no-reactions-are-activated-for-the-mixture-material-some-species-show-a-non-zero-net-reaction-rate\/"},"modified":"2023-07-31T12:27:54","modified_gmt":"2023-07-31T12:27:54","slug":"i-am-running-fluent-non-reacting-case-with-the-edc-model-active-edc-model-option-is-turned-on-but-no-reactions-are-activated-for-the-mixture-material-some-species-show-a-non-zero-net-reaction-rate","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-am-running-fluent-non-reacting-case-with-the-edc-model-active-edc-model-option-is-turned-on-but-no-reactions-are-activated-for-the-mixture-material-some-species-show-a-non-zero-net-reaction-rate\/","title":{"rendered":"I am running Fluent non-reacting case with the EDC model active. EDC model option is turned on, but no reactions are activated for the Mixture material  Some species show a non-zero net reaction rate, however.   How can this be? Is this a defect?"},"content":{"rendered":"<p>This is a post-processing artifact.  In the EDC model, reaction rates are computed by the following equation: &#8212;&#8212;&#8212;&#8211; R=C*(C_YI(c,t,i)-C_YI_EDC(c,t,i))\/time_scale.  &#8212;&#8212;&#8212;&#8211; where C_YI is the result of species mass fraction from solving the transport equation and C_YI_EDC is the result from the chemistry solver.    C_YI and C_YI_EDC are always the same if there is no reaction.  These rates are not saved, however, and are calculated  on-the-fly for post-processing. C_YI_EDC(c,t,i) is the result from the previous iteration while C_YI(c,t,i) is the result of the current iteration. These are not the same before solution is converged. As the solution gets converged, C_YI_EDC(c,t,i) and C_YI(c,t,i) get closer, and eventually the artifact will disappear.<\/p>\n","protected":false},"template":"","class_list":["post-167082","topic","type-topic","status-publish","hentry","topic-tag-19-2","topic-tag-finite-rate-chemistry","topic-tag-fluent","topic-tag-fluid-dynamics","topic-tag-species-reactions","topic-tag-udf-scripting-act-pyansys"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"This is a post-processing artifact. In the EDC model, reaction rates are computed by the following equation: ----------- R=C*(C_YI(c,t,i)-C_YI_EDC(c,t,i))\/time_scale. ----------- where C_YI is the result of species mass fraction from solving the transport equation and C_YI_EDC is the result from the chemistry solver. C_YI and C_YI_EDC are always the same if there is no reaction.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-am-running-fluent-non-reacting-case-with-the-edc-model-active-edc-model-option-is-turned-on-but-no-reactions-are-activated-for-the-mixture-material-some-species-show-a-non-zero-net-reaction-rate\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Knowledge | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"I am running Fluent non-reacting case with the EDC model active. EDC model option is turned on, but no reactions are activated for the Mixture material Some species show a non-zero net reaction rate, however. How can this be? Is this a defect? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"This is a post-processing artifact. In the EDC model, reaction rates are computed by the following equation: ----------- R=C*(C_YI(c,t,i)-C_YI_EDC(c,t,i))\/time_scale. ----------- where C_YI is the result of species mass fraction from solving the transport equation and C_YI_EDC is the result from the chemistry solver. C_YI and C_YI_EDC are always the same if there is no reaction.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-am-running-fluent-non-reacting-case-with-the-edc-model-active-edc-model-option-is-turned-on-but-no-reactions-are-activated-for-the-mixture-material-some-species-show-a-non-zero-net-reaction-rate\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-04-05T14:32:50+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-31T12:27:54+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"I am running Fluent non-reacting case with the EDC model active. EDC model option is turned on, but no reactions are activated for the Mixture material Some species show a non-zero net reaction rate, however. How can this be? Is this a defect? | Ansys Knowledge\" \/>\n\t\t<meta name=\"twitter:description\" content=\"This is a post-processing artifact. In the EDC model, reaction rates are computed by the following equation: ----------- R=C*(C_YI(c,t,i)-C_YI_EDC(c,t,i))\/time_scale. ----------- where C_YI is the result of species mass fraction from solving the transport equation and C_YI_EDC is the result from the chemistry solver. 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EDC model option is turned on, but no reactions are activated for the Mixture material  Some species show a non-zero net reaction rate, however.   How can this be? Is this a defect?"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-am-running-fluent-non-reacting-case-with-the-edc-model-active-edc-model-option-is-turned-on-but-no-reactions-are-activated-for-the-mixture-material-some-species-show-a-non-zero-net-reaction-rate\/#listItem","position":4,"name":"I am running Fluent non-reacting case with the EDC model active. EDC model option is turned on, but no reactions are activated for the Mixture material  Some species show a non-zero net reaction rate, however.   How can this be? 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EDC model option is turned on, but no reactions are activated for the Mixture material Some species show a non-zero net reaction rate, however. How can this be? Is this a defect? | Ansys Knowledge","description":"This is a post-processing artifact. In the EDC model, reaction rates are computed by the following equation: ----------- R=C*(C_YI(c,t,i)-C_YI_EDC(c,t,i))\/time_scale. ----------- where C_YI is the result of species mass fraction from solving the transport equation and C_YI_EDC is the result from the chemistry solver. 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EDC model option is turned on, but no reactions are activated for the Mixture material Some species show a non-zero net reaction rate, however. How can this be? Is this a defect? | Ansys Knowledge","og:description":"This is a post-processing artifact. In the EDC model, reaction rates are computed by the following equation: ----------- R=C*(C_YI(c,t,i)-C_YI_EDC(c,t,i))\/time_scale. ----------- where C_YI is the result of species mass fraction from solving the transport equation and C_YI_EDC is the result from the chemistry solver. C_YI and C_YI_EDC are always the same if there is no reaction.","og:url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/i-am-running-fluent-non-reacting-case-with-the-edc-model-active-edc-model-option-is-turned-on-but-no-reactions-are-activated-for-the-mixture-material-some-species-show-a-non-zero-net-reaction-rate\/","article:published_time":"2023-04-05T14:32:50+00:00","article:modified_time":"2023-07-31T12:27:54+00:00","twitter:card":"summary_large_image","twitter:title":"I am running Fluent non-reacting case with the EDC model active. EDC model option is turned on, but no reactions are activated for the Mixture material Some species show a non-zero net reaction rate, however. How can this be? Is this a defect? | Ansys Knowledge","twitter:description":"This is a post-processing artifact. In the EDC model, reaction rates are computed by the following equation: ----------- R=C*(C_YI(c,t,i)-C_YI_EDC(c,t,i))\/time_scale. ----------- where C_YI is the result of species mass fraction from solving the transport equation and C_YI_EDC is the result from the chemistry solver. 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EDC model option is turned on, but no reactions are activated for the Mixture material  Some species show a non-zero net reaction rate, however.   How can this be? Is this a defect?\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/innovationspace.ansys.com\/knowledge"},{"label":"Topics","link":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/"},{"label":"fluent","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/fluent\/"},{"label":"I am running Fluent non-reacting case with the EDC model active. EDC model option is turned on, but no reactions are activated for the Mixture material  Some species show a non-zero net reaction rate, however.   How can this be? 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