{"id":165032,"date":"2023-03-17T08:59:16","date_gmt":"2023-03-17T08:59:16","guid":{"rendered":"\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/"},"modified":"2023-07-31T12:26:46","modified_gmt":"2023-07-31T12:26:46","slug":"how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/","title":{"rendered":"How do you calculate the unburnt char in a CFX coal combustion calculation?"},"content":{"rendered":"<p>\u00e2\u20ac\u00a2Please start the calculation with the option  Output Control -> Results -> Extra Output Variables List  \u00e2\u20ac\u00a2Choose one variable for every Particle group you defined.  \u00e2\u20ac\u00a2Please choose any variable but Volume Fraction. This option activates an internal hook to write the mass flow variable of the particle tracks into the result file.  \u00e2\u20ac\u00a2You can evaluate the mass flow of the particles within your domain similar to the Eulerian phase variables.  \u00e2\u20ac\u00a2In ANSYS CFX please do the following (assuming HC Fuel as particle material name):  \u00e2\u20ac\u00a2Generate an Expression CharMassflowCalc = HC Fuel.Mass Flow * HC Fuel.Char.Mass Fraction \u00e2\u20ac\u00a2Generate a variable referencing the Expression: Char Mass flow = CharMassflowCalc  \u00e2\u20ac\u00a2Create a plane where you want to calculate the massflow  \u00e2\u20ac\u00a2Bound the plane if necessary (Plane definition -> Geometry tab -> Plane Bounds) \u00e2\u20ac\u00a2You can set the center of the bounding box if the plane is set by three points \u00e2\u20ac\u00a2The first point specifies the center.  \u00e2\u20ac\u00a2Sum up the variable Char Mass flow over the plane: sum(Char Mass flow)@plane 1<\/p>\n","protected":false},"template":"","class_list":["post-165032","topic","type-topic","status-publish","hentry","topic-tag-4424","topic-tag-cfx","topic-tag-fluid-dynamics","topic-tag-reacting-flows","topic-tag-species-reactions"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u00e2\u20ac\u00a2Please start the calculation with the option Output Control -&gt; Results -&gt; Extra Output Variables List \u00e2\u20ac\u00a2Choose one variable for every Particle group you defined. \u00e2\u20ac\u00a2Please choose any variable but Volume Fraction. This option activates an internal hook to write the mass flow variable of the particle tracks into the result file. \u00e2\u20ac\u00a2You can evaluate\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/\" \/>\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=\"How do you calculate the unburnt char in a CFX coal combustion calculation? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"\u00e2\u20ac\u00a2Please start the calculation with the option Output Control -&gt; Results -&gt; Extra Output Variables List \u00e2\u20ac\u00a2Choose one variable for every Particle group you defined. \u00e2\u20ac\u00a2Please choose any variable but Volume Fraction. This option activates an internal hook to write the mass flow variable of the particle tracks into the result file. \u00e2\u20ac\u00a2You can evaluate\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-03-17T08:59:16+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-31T12:26:46+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"How do you calculate the unburnt char in a CFX coal combustion calculation? | Ansys Knowledge\" \/>\n\t\t<meta name=\"twitter:description\" content=\"\u00e2\u20ac\u00a2Please start the calculation with the option Output Control -&gt; Results -&gt; Extra Output Variables List \u00e2\u20ac\u00a2Choose one variable for every Particle group you defined. \u00e2\u20ac\u00a2Please choose any variable but Volume Fraction. This option activates an internal hook to write the mass flow variable of the particle tracks into the result file. \u00e2\u20ac\u00a2You can evaluate\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/cfx\\\/#listItem\",\"name\":\"cfx\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/cfx\\\/#listItem\",\"position\":3,\"name\":\"cfx\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/cfx\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\\\/#listItem\",\"name\":\"How do you calculate the unburnt char in a CFX coal combustion calculation?\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\\\/#listItem\",\"position\":4,\"name\":\"How do you calculate the unburnt char in a CFX coal combustion calculation?\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/cfx\\\/#listItem\",\"name\":\"cfx\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#organization\",\"name\":\"Ansys Knowledge\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\\\/\",\"name\":\"How do you calculate the unburnt char in a CFX coal combustion calculation? | Ansys Knowledge\",\"description\":\"\\u00e2\\u20ac\\u00a2Please start the calculation with the option Output Control -> Results -> Extra Output Variables List \\u00e2\\u20ac\\u00a2Choose one variable for every Particle group you defined. \\u00e2\\u20ac\\u00a2Please choose any variable but Volume Fraction. This option activates an internal hook to write the mass flow variable of the particle tracks into the result file. \\u00e2\\u20ac\\u00a2You can evaluate\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\\\/#breadcrumblist\"},\"datePublished\":\"2023-03-17T08:59:16+00:00\",\"dateModified\":\"2023-07-31T12:26:46+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/\",\"name\":\"Ansys Knowledge\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"How do you calculate the unburnt char in a CFX coal combustion calculation? | Ansys Knowledge","description":"\u00e2\u20ac\u00a2Please start the calculation with the option Output Control -> Results -> Extra Output Variables List \u00e2\u20ac\u00a2Choose one variable for every Particle group you defined. \u00e2\u20ac\u00a2Please choose any variable but Volume Fraction. This option activates an internal hook to write the mass flow variable of the particle tracks into the result file. \u00e2\u20ac\u00a2You can evaluate","canonical_url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/#breadcrumblist","itemListElement":[{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge#listItem","position":1,"name":"Home","item":"https:\/\/innovationspace.ansys.com\/knowledge","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","position":2,"name":"Topics","item":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/cfx\/#listItem","name":"cfx"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/cfx\/#listItem","position":3,"name":"cfx","item":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/cfx\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/#listItem","name":"How do you calculate the unburnt char in a CFX coal combustion calculation?"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/#listItem","name":"Topics"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/#listItem","position":4,"name":"How do you calculate the unburnt char in a CFX coal combustion calculation?","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/cfx\/#listItem","name":"cfx"}}]},{"@type":"Organization","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#organization","name":"Ansys Knowledge","description":"Ansys Innovation Space","url":"https:\/\/innovationspace.ansys.com\/knowledge\/"},{"@type":"WebPage","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/#webpage","url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/","name":"How do you calculate the unburnt char in a CFX coal combustion calculation? | Ansys Knowledge","description":"\u00e2\u20ac\u00a2Please start the calculation with the option Output Control -> Results -> Extra Output Variables List \u00e2\u20ac\u00a2Choose one variable for every Particle group you defined. \u00e2\u20ac\u00a2Please choose any variable but Volume Fraction. This option activates an internal hook to write the mass flow variable of the particle tracks into the result file. \u00e2\u20ac\u00a2You can evaluate","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/#breadcrumblist"},"datePublished":"2023-03-17T08:59:16+00:00","dateModified":"2023-07-31T12:26:46+00:00"},{"@type":"WebSite","@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#website","url":"https:\/\/innovationspace.ansys.com\/knowledge\/","name":"Ansys Knowledge","description":"Ansys Innovation Space","inLanguage":"en-US","publisher":{"@id":"https:\/\/innovationspace.ansys.com\/knowledge\/#organization"}}]},"og:locale":"en_US","og:site_name":"Ansys Knowledge | Ansys Innovation Space","og:type":"article","og:title":"How do you calculate the unburnt char in a CFX coal combustion calculation? | Ansys Knowledge","og:description":"\u00e2\u20ac\u00a2Please start the calculation with the option Output Control -&gt; Results -&gt; Extra Output Variables List \u00e2\u20ac\u00a2Choose one variable for every Particle group you defined. \u00e2\u20ac\u00a2Please choose any variable but Volume Fraction. This option activates an internal hook to write the mass flow variable of the particle tracks into the result file. \u00e2\u20ac\u00a2You can evaluate","og:url":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/","article:published_time":"2023-03-17T08:59:16+00:00","article:modified_time":"2023-07-31T12:26:46+00:00","twitter:card":"summary_large_image","twitter:title":"How do you calculate the unburnt char in a CFX coal combustion calculation? | Ansys Knowledge","twitter:description":"\u00e2\u20ac\u00a2Please start the calculation with the option Output Control -&gt; Results -&gt; Extra Output Variables List \u00e2\u20ac\u00a2Choose one variable for every Particle group you defined. \u00e2\u20ac\u00a2Please choose any variable but Volume Fraction. This option activates an internal hook to write the mass flow variable of the particle tracks into the result file. \u00e2\u20ac\u00a2You can evaluate"},"aioseo_meta_data":{"post_id":"165032","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"created":"2025-10-17 21:50:13","updated":"2026-07-29 15:40:34","ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/knowledge\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/knowledge\/topics\/\" title=\"Topics\">Topics<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/cfx\/\" title=\"cfx\">cfx<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tHow do you calculate the unburnt char in a CFX coal combustion calculation?\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":"cfx","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic-tag\/cfx\/"},{"label":"How do you calculate the unburnt char in a CFX coal combustion calculation?","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-do-you-calculate-the-unburnt-char-in-a-cfx-coal-combustion-calculation\/"}],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["3-15-2023  20:20:52"],"_bbp_forum_id":["27784"],"_bbp_author_ip":["23.56.168.180"],"_btv_view_count":["620"],"siebel_km_number":["715441"],"product_version":["16"],"km_published_date":["2008-02-14T00:00:00.000Z"],"family":["Fluid Dynamics"],"application_name":["CFX"],"_edit_lock":["1705050545:2"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/165032","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\/165032\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=165032"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}