{"id":140968,"date":"2021-02-02T15:23:08","date_gmt":"2021-02-02T15:23:08","guid":{"rendered":"\/forum\/forums\/reply\/140968\/"},"modified":"2021-02-02T15:23:08","modified_gmt":"2021-02-02T15:23:08","slug":"140968","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/140968\/","title":{"rendered":"Reply To: FLUENT UDF EXECUTION WHILE USING THE COUPLED SOLVER"},"content":{"rendered":"<p>Hi Rob, I need to change the pressure profile within the time step because it depends on the current flowrate value through that outlet, it is a kind of &#8216;resistance boundary condition&#8217;. I know this could seem unstable from a numerical viewpoint but hopefully, the numerical solver will converge to a certain solution after 20-30 inner iterations. In this way, it is possible to see how the pressure update on that boundary undergoes almost no changes once the solution is definetly convering (from 20th iteration on). All this can be observed in a segregated solver simulation without the usage of an overset mesh.nAnyway, I would like also to post here a picture from the iterative algorithm used on ANSYS FLUENT for both solvers, as you&#8217;ll se, theoretically, DEFINE_PROFILE shall be updated every inner iteration. This is what actually makes me wonder what&#8217;s happenning in there, since the same UDF code works perfectly with a segregated solver simulation.n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/B45SJ3L7ZF0A\/image.png\" width=\"702\" height=\"546\" \/>n<\/p>\n","protected":false},"template":"","class_list":["post-140968","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi Rob, I need to change the pressure profile within the time step because it depends on the current flowrate value through that outlet, it is a kind of &#039;resistance boundary condition&#039;. I know this could seem unstable from a numerical viewpoint but hopefully, the numerical solver will converge to a certain solution after 20-30\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/140968\/\" \/>\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=\"Reply To: FLUENT UDF EXECUTION WHILE USING THE COUPLED SOLVER | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hi Rob, I need to change the pressure profile within the time step because it depends on the current flowrate value through that outlet, it is a kind of &#039;resistance boundary condition&#039;. I know this could seem unstable from a numerical viewpoint but hopefully, the numerical solver will converge to a certain solution after 20-30\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/140968\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/B45SJ3L7ZF0A\/image.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/B45SJ3L7ZF0A\/image.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2021-02-02T15:23:08+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2021-02-02T15:23:08+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: FLUENT UDF EXECUTION WHILE USING THE COUPLED SOLVER | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hi Rob, I need to change the pressure profile within the time step because it depends on the current flowrate value through that outlet, it is a kind of &#039;resistance boundary condition&#039;. I know this could seem unstable from a numerical viewpoint but hopefully, the numerical solver will converge to a certain solution after 20-30\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/B45SJ3L7ZF0A\/image.png\" \/>\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\\\/reply\\\/140968\\\/#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\\\/forums\\\/reply\\\/140968\\\/#listItem\",\"name\":\"Reply To: FLUENT UDF EXECUTION WHILE USING THE COUPLED SOLVER\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/140968\\\/#listItem\",\"position\":2,\"name\":\"Reply To: FLUENT UDF EXECUTION WHILE USING THE COUPLED SOLVER\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}}]},{\"@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\\\/reply\\\/140968\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/140968\\\/\",\"name\":\"Reply To: FLUENT UDF EXECUTION WHILE USING THE COUPLED SOLVER | Ansys Learning Forum\",\"description\":\"Hi Rob, I need to change the pressure profile within the time step because it depends on the current flowrate value through that outlet, it is a kind of 'resistance boundary condition'. 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I know this could seem unstable from a numerical viewpoint but hopefully, the numerical solver will converge to a certain solution after 20-30","canonical_url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/140968\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BreadcrumbList","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/140968\/#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\/forums\/reply\/140968\/#listItem","name":"Reply To: FLUENT UDF EXECUTION WHILE USING THE COUPLED SOLVER"}},{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/140968\/#listItem","position":2,"name":"Reply To: FLUENT UDF EXECUTION WHILE USING THE COUPLED SOLVER","previousItem":{"@type":"ListItem","@id":"https:\/\/innovationspace.ansys.com\/forum#listItem","name":"Home"}}]},{"@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\/reply\/140968\/#webpage","url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/140968\/","name":"Reply To: FLUENT UDF EXECUTION WHILE USING THE COUPLED SOLVER | Ansys Learning Forum","description":"Hi Rob, I need to change the pressure profile within the time step because it depends on the current flowrate value through that outlet, it is a kind of 'resistance boundary condition'. I know this could seem unstable from a numerical viewpoint but hopefully, the numerical solver will converge to a certain solution after 20-30","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/#website"},"breadcrumb":{"@id":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/140968\/#breadcrumblist"},"datePublished":"2021-02-02T15:23:08+00:00","dateModified":"2021-02-02T15:23:08+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":"Reply To: FLUENT UDF EXECUTION WHILE USING THE COUPLED SOLVER | Ansys Learning Forum","og:description":"Hi Rob, I need to change the pressure profile within the time step because it depends on the current flowrate value through that outlet, it is a kind of 'resistance boundary condition'. I know this could seem unstable from a numerical viewpoint but hopefully, the numerical solver will converge to a certain solution after 20-30","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/140968\/","og:image":"https:\/\/us.v-cdn.net\/6032193\/uploads\/B45SJ3L7ZF0A\/image.png","og:image:secure_url":"https:\/\/us.v-cdn.net\/6032193\/uploads\/B45SJ3L7ZF0A\/image.png","article:published_time":"2021-02-02T15:23:08+00:00","article:modified_time":"2021-02-02T15:23:08+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: FLUENT UDF EXECUTION WHILE USING THE COUPLED SOLVER | Ansys Learning Forum","twitter:description":"Hi Rob, I need to change the pressure profile within the time step because it depends on the current flowrate value through that outlet, it is a kind of 'resistance boundary condition'. 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