{"id":51563,"date":"2021-01-24T10:37:29","date_gmt":"2021-01-24T10:37:29","guid":{"rendered":"\/forum\/forums\/topic\/is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error\/"},"modified":"2021-01-24T10:37:29","modified_gmt":"2021-01-24T10:37:29","slug":"is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error\/","title":{"rendered":"Is the UDF for Herschel-Bulkley viscosity model right? I am receving AMG solver error."},"content":{"rendered":"<p>Hello,nI have written a UDF code for the Herschel-Bulkley viscosity model. n<strong>CODE:<\/strong>n#include udf.hnFILE *fp;nDEFINE_PROPERTY(hb_viscosity, c, t)n{nreal viscosity;nreal stress;nreal ys;nreal n, m;nreal k;nreal Max, Min;nn = 0.94;\u00a0nys = 4.022;\u00a0nk = 0.04;\u00a0nm = 1000;nMax = 100000;nMin = 0.00000000001;nstress = C_STRAIN_RATE_MAG(c,t);nnviscosity = ys*(1-exp(-m*stress))\/stress + k*pow(stress,n-1);nnreturn viscosity;n}nnI am receiving an AMG solver error when I try to run the solution.  Which equation does ANSYS use to calculate the viscosity?nWhen I try to use the in-built Herschel-Bulkley model, I don&#8217;t get a stable value from the Grid sensitivity analysis. Any kind of help will be very kind.nThanks.n<\/p>\n","protected":false},"template":"","class_list":["post-51563","topic","type-topic","status-closed","hentry","topic-tag-divergence-in-amg-solver","topic-tag-diverging","topic-tag-herschel-bulkley","topic-tag-udf","topic-tag-udf-viscosity-model"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello,nI have written a UDF code for the Herschel-Bulkley viscosity model. nCODE:n#include udf.hnFILE *fp;nDEFINE_PROPERTY(hb_viscosity, c, t)n{nreal viscosity;nreal stress;nreal ys;nreal n, m;nreal k;nreal Max, Min;nn = 0.94; nys = 4.022; nk = 0.04; nm = 1000;nMax = 100000;nMin = 0.00000000001;nstress = C_STRAIN_RATE_MAG(c,t);nnviscosity = ys*(1-exp(-m*stress))\/stress + k*pow(stress,n-1);nnreturn viscosity;n}nnI am receiving an AMG solver error when I try to run the\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error\/\" \/>\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=\"Is the UDF for Herschel-Bulkley viscosity model right? I am receving AMG solver error. | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello,nI have written a UDF code for the Herschel-Bulkley viscosity model. nCODE:n#include udf.hnFILE *fp;nDEFINE_PROPERTY(hb_viscosity, c, t)n{nreal viscosity;nreal stress;nreal ys;nreal n, m;nreal k;nreal Max, Min;nn = 0.94; nys = 4.022; nk = 0.04; nm = 1000;nMax = 100000;nMin = 0.00000000001;nstress = C_STRAIN_RATE_MAG(c,t);nnviscosity = ys*(1-exp(-m*stress))\/stress + k*pow(stress,n-1);nnreturn viscosity;n}nnI am receiving an AMG solver error when I try to run the\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2021-01-24T10:37:29+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2021-01-24T10:37:29+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Is the UDF for Herschel-Bulkley viscosity model right? I am receving AMG solver error. | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello,nI have written a UDF code for the Herschel-Bulkley viscosity model. nCODE:n#include udf.hnFILE *fp;nDEFINE_PROPERTY(hb_viscosity, c, t)n{nreal viscosity;nreal stress;nreal ys;nreal n, m;nreal k;nreal Max, Min;nn = 0.94; nys = 4.022; nk = 0.04; nm = 1000;nMax = 100000;nMin = 0.00000000001;nstress = C_STRAIN_RATE_MAG(c,t);nnviscosity = ys*(1-exp(-m*stress))\/stress + k*pow(stress,n-1);nnreturn viscosity;n}nnI am receiving an AMG solver error when I try to run the\" \/>\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\\\/is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error\\\/#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\\\/#listItem\",\"name\":\"udf\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/udf\\\/#listItem\",\"position\":3,\"name\":\"udf\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/udf\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error\\\/#listItem\",\"name\":\"Is the UDF for Herschel-Bulkley viscosity model right? 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I am receving AMG solver error. | Ansys Learning Forum\",\"description\":\"Hello,nI have written a UDF code for the Herschel-Bulkley viscosity model. nCODE:n#include udf.hnFILE *fp;nDEFINE_PROPERTY(hb_viscosity, c, t)n{nreal viscosity;nreal stress;nreal ys;nreal n, m;nreal k;nreal Max, Min;nn = 0.94; nys = 4.022; nk = 0.04; nm = 1000;nMax = 100000;nMin = 0.00000000001;nstress = C_STRAIN_RATE_MAG(c,t);nnviscosity = ys*(1-exp(-m*stress))\\\/stress + k*pow(stress,n-1);nnreturn viscosity;n}nnI am receiving an AMG solver error when I try to run the\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error\\\/#breadcrumblist\"},\"datePublished\":\"2021-01-24T10:37:29+00:00\",\"dateModified\":\"2021-01-24T10:37:29+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":"Is the UDF for Herschel-Bulkley viscosity model right? I am receving AMG solver error. | Ansys Learning Forum","description":"Hello,nI have written a UDF code for the Herschel-Bulkley viscosity model. nCODE:n#include udf.hnFILE *fp;nDEFINE_PROPERTY(hb_viscosity, c, t)n{nreal viscosity;nreal stress;nreal ys;nreal n, m;nreal k;nreal Max, Min;nn = 0.94; nys = 4.022; nk = 0.04; nm = 1000;nMax = 100000;nMin = 0.00000000001;nstress = C_STRAIN_RATE_MAG(c,t);nnviscosity = ys*(1-exp(-m*stress))\/stress + k*pow(stress,n-1);nnreturn viscosity;n}nnI am receiving an AMG solver error when I try to run the","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error\/#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\/#listItem","name":"udf"},"previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","name":"Home"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/udf\/#listItem","position":3,"name":"udf","item":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic-tag\/udf\/","nextItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error\/#listItem","name":"Is the UDF for Herschel-Bulkley viscosity model right? 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I am receving AMG solver error. | Ansys Learning Forum","description":"Hello,nI have written a UDF code for the Herschel-Bulkley viscosity model. nCODE:n#include udf.hnFILE *fp;nDEFINE_PROPERTY(hb_viscosity, c, t)n{nreal viscosity;nreal stress;nreal ys;nreal n, m;nreal k;nreal Max, Min;nn = 0.94; nys = 4.022; nk = 0.04; nm = 1000;nMax = 100000;nMin = 0.00000000001;nstress = C_STRAIN_RATE_MAG(c,t);nnviscosity = ys*(1-exp(-m*stress))\/stress + k*pow(stress,n-1);nnreturn viscosity;n}nnI am receiving an AMG solver error when I try to run the","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error\/#breadcrumblist"},"datePublished":"2021-01-24T10:37:29+00:00","dateModified":"2021-01-24T10:37:29+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"}}]},"og:locale":"en_US","og:site_name":"Ansys Learning Forum | Ansys Innovation Space","og:type":"article","og:title":"Is the UDF for Herschel-Bulkley viscosity model right? I am receving AMG solver error. | Ansys Learning Forum","og:description":"Hello,nI have written a UDF code for the Herschel-Bulkley viscosity model. nCODE:n#include udf.hnFILE *fp;nDEFINE_PROPERTY(hb_viscosity, c, t)n{nreal viscosity;nreal stress;nreal ys;nreal n, m;nreal k;nreal Max, Min;nn = 0.94; nys = 4.022; nk = 0.04; nm = 1000;nMax = 100000;nMin = 0.00000000001;nstress = C_STRAIN_RATE_MAG(c,t);nnviscosity = ys*(1-exp(-m*stress))\/stress + k*pow(stress,n-1);nnreturn viscosity;n}nnI am receiving an AMG solver error when I try to run the","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/is-the-udf-for-herschel-bulkley-viscosity-model-right-i-am-receving-amg-solver-error\/","article:published_time":"2021-01-24T10:37:29+00:00","article:modified_time":"2021-01-24T10:37:29+00:00","twitter:card":"summary_large_image","twitter:title":"Is the UDF for Herschel-Bulkley viscosity model right? I am receving AMG solver error. | Ansys Learning Forum","twitter:description":"Hello,nI have written a UDF code for the Herschel-Bulkley viscosity model. nCODE:n#include udf.hnFILE *fp;nDEFINE_PROPERTY(hb_viscosity, c, t)n{nreal viscosity;nreal stress;nreal ys;nreal n, m;nreal k;nreal Max, Min;nn = 0.94; nys = 4.022; nk = 0.04; nm = 1000;nMax = 100000;nMin = 0.00000000001;nstress = C_STRAIN_RATE_MAG(c,t);nnviscosity = ys*(1-exp(-m*stress))\/stress + k*pow(stress,n-1);nnreturn viscosity;n}nnI am receiving an AMG solver error when I try to run the"},"aioseo_meta_data":{"post_id":"51563","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":"content","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":true,"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":"2024-10-28 22:55:41","updated":"2024-10-28 22:55:41","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\/forum\" 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\/forum\/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\/forum\/forums\/topic-tag\/udf\/\" title=\"udf\">udf<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tIs the UDF for Herschel-Bulkley viscosity model right? 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