{"id":391700,"date":"2024-10-29T08:52:03","date_gmt":"2024-10-29T08:52:03","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/391700\/"},"modified":"2024-10-29T08:52:03","modified_gmt":"2024-10-29T08:52:03","slug":"391700","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/391700\/","title":{"rendered":"Reply To: CFD Simulation: mesh model unsteady"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;\/p&gt;&lt;p&gt;When increasing the number of processors, parallelization effects can sometimes lead to inconsistencies. Increasing the number of cores improves computation speed, but it can also cause more numerical instability due to partitioning effects, especially in complex geometries or with polyhedral meshes.I suggest you to&nbsp;try reducing the under-relaxation factors, particularly for pressure and momentum. This can slow the progress of each iteration slightly but can help with stability.&nbsp;Ensure that the boundary layer mesh near walls provides the necessary y+ values suitable for the k-&epsilon; model&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-391700","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,When increasing the number of processors, parallelization effects can sometimes lead to inconsistencies. Increasing the number of cores improves computation speed, but it can also cause more numerical instability due to partitioning effects, especially in complex geometries or with polyhedral meshes.I suggest you to try reducing the under-relaxation factors, particularly for pressure and momentum. This can\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/391700\/\" \/>\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: CFD Simulation: mesh model unsteady | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hi,When increasing the number of processors, parallelization effects can sometimes lead to inconsistencies. Increasing the number of cores improves computation speed, but it can also cause more numerical instability due to partitioning effects, especially in complex geometries or with polyhedral meshes.I suggest you to try reducing the under-relaxation factors, particularly for pressure and momentum. This can\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/391700\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-10-29T08:52:03+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-10-29T08:52:03+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: CFD Simulation: mesh model unsteady | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hi,When increasing the number of processors, parallelization effects can sometimes lead to inconsistencies. 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This can\" \/>\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\\\/391700\\\/#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\\\/391700\\\/#listItem\",\"name\":\"Reply To: CFD Simulation: mesh model unsteady\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/391700\\\/#listItem\",\"position\":2,\"name\":\"Reply To: CFD Simulation: mesh model unsteady\",\"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\\\/391700\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/reply\\\/391700\\\/\",\"name\":\"Reply To: CFD Simulation: mesh model unsteady | Ansys Learning Forum\",\"description\":\"Hi,When increasing the number of processors, parallelization effects can sometimes lead to inconsistencies. Increasing the number of cores improves computation speed, but it can also cause more numerical instability due to partitioning effects, especially in complex geometries or with polyhedral meshes.I suggest you to try reducing the under-relaxation factors, particularly for pressure and momentum. 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Increasing the number of cores improves computation speed, but it can also cause more numerical instability due to partitioning effects, especially in complex geometries or with polyhedral meshes.I suggest you to try reducing the under-relaxation factors, particularly for pressure and momentum. 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Increasing the number of cores improves computation speed, but it can also cause more numerical instability due to partitioning effects, especially in complex geometries or with polyhedral meshes.I suggest you to try reducing the under-relaxation factors, particularly for pressure and momentum. This can","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/391700\/","article:published_time":"2024-10-29T08:52:03+00:00","article:modified_time":"2024-10-29T08:52:03+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: CFD Simulation: mesh model unsteady | Ansys Learning Forum","twitter:description":"Hi,When increasing the number of processors, parallelization effects can sometimes lead to inconsistencies. 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