{"id":51821,"date":"2021-02-02T04:45:45","date_gmt":"2021-02-02T04:45:45","guid":{"rendered":"\/forum\/forums\/topic\/mass-fraction-udf\/"},"modified":"2021-02-02T04:45:45","modified_gmt":"2021-02-02T04:45:45","slug":"mass-fraction-udf","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mass-fraction-udf\/","title":{"rendered":"mass fraction UDF"},"content":{"rendered":"<p>Hello to all,I have a problem in defining the UDF behind the shadow surface. For this, I have been using mass fraction specie (c1,t1) for shadow surface while for for defining mass fraction specie on the coupled wall I am using (c0,t0). Am I using right approach?.n#include udf.hn#include prop.hn#include sg.hn#include mem.hnn\/*******************************************************************************\/nnDEFINE_PROFILE(mfm_h, thread, position)n{nn\u00a0double mh, mc, fh, fc;nn\u00a0real x[ND_ND];n\u00a0face_t f;n\u00a0Thread *t0, *t1;n\u00a0cell_t c0, c1;nn\u00a0begin_f_loop(f, thread)n\u00a0{nn\u00a0c0 = F_C0(f, thread);n\u00a0t0 = THREAD_T0(thread);n\u00a0c1 = F_C1(f, thread);n\u00a0t1 = THREAD_T1(thread);nn\u00a0\u00a0fh\u00a0= C_YI(c0, t0, 0);n\u00a0\u00a0fc\u00a0= C_YI(c1, t1, 0);nn\u00a0\u00a0mh\u00a0= fh*0.95;n\u00a0\u00a0mc\u00a0= fc+fh-mh;\u00a0F_PROFILE(f, thread, position)= mh;nn\u00a0}n\u00a0end_f_loop(f, thread)nn}\/*******************************************************************************\/nn\u00a0fc\u00a0= C_YI(c1, t1, 0);n\u00a0mc\u00a0= fc+fh-mh;nThis is making problem when i remove both from the above, this UDF runs. As per given equation, I have to first define mass fraction on shadow surface which is Fc. Am I doing anything wrong? nPlease guide me seniors.nnRegards,nAbbas Razann<\/p>\n","protected":false},"template":"","class_list":["post-51821","topic","type-topic","status-closed","hentry","topic-tag-mass-fraction","topic-tag-udf","topic-tag-udf-fluent"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello to all,I have a problem in defining the UDF behind the shadow surface. For this, I have been using mass fraction specie (c1,t1) for shadow surface while for for defining mass fraction specie on the coupled wall I am using (c0,t0). Am I using right approach?.n#include udf.hn#include prop.hn#include sg.hn#include mem.hnn\/*******************************************************************************\/nnDEFINE_PROFILE(mfm_h, thread, position)n{nn double mh, mc,\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mass-fraction-udf\/\" \/>\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 Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"mass fraction UDF | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello to all,I have a problem in defining the UDF behind the shadow surface. For this, I have been using mass fraction specie (c1,t1) for shadow surface while for for defining mass fraction specie on the coupled wall I am using (c0,t0). Am I using right approach?.n#include udf.hn#include prop.hn#include sg.hn#include mem.hnn\/*******************************************************************************\/nnDEFINE_PROFILE(mfm_h, thread, position)n{nn double mh, mc,\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/mass-fraction-udf\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2021-02-02T04:45:45+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2021-02-02T04:45:45+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"mass fraction UDF | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello to all,I have a problem in defining the UDF behind the shadow surface. For this, I have been using mass fraction specie (c1,t1) for shadow surface while for for defining mass fraction specie on the coupled wall I am using (c0,t0). Am I using right approach?.n#include udf.hn#include prop.hn#include sg.hn#include mem.hnn\/*******************************************************************************\/nnDEFINE_PROFILE(mfm_h, thread, position)n{nn double mh, mc,\" \/>\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\\\/forum\\\/forums\\\/topic\\\/mass-fraction-udf\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/udf-fluent\\\/#listItem\",\"name\":\"udf-fluent\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/udf-fluent\\\/#listItem\",\"position\":3,\"name\":\"udf-fluent\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/udf-fluent\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mass-fraction-udf\\\/#listItem\",\"name\":\"mass fraction UDF\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mass-fraction-udf\\\/#listItem\",\"position\":4,\"name\":\"mass fraction UDF\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/udf-fluent\\\/#listItem\",\"name\":\"udf-fluent\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mass-fraction-udf\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mass-fraction-udf\\\/\",\"name\":\"mass fraction UDF | Ansys Learning Forum\",\"description\":\"Hello to all,I have a problem in defining the UDF behind the shadow surface. For this, I have been using mass fraction specie (c1,t1) for shadow surface while for for defining mass fraction specie on the coupled wall I am using (c0,t0). Am I using right approach?.n#include udf.hn#include prop.hn#include sg.hn#include mem.hnn\\\/*******************************************************************************\\\/nnDEFINE_PROFILE(mfm_h, thread, position)n{nn double mh, mc,\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/mass-fraction-udf\\\/#breadcrumblist\"},\"datePublished\":\"2021-02-02T04:45:45+00:00\",\"dateModified\":\"2021-02-02T04:45:45+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"mass fraction UDF | Ansys Learning Forum","description":"Hello to all,I have a problem in defining the UDF behind the shadow surface. For this, I have been using mass fraction specie (c1,t1) for shadow surface while for for defining mass fraction specie on the coupled wall I am using (c0,t0). 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