{"id":171059,"date":"2023-06-05T07:05:36","date_gmt":"2023-06-05T07:05:36","guid":{"rendered":"\/knowledge\/forums\/topic\/getting-error-while-applying-a-symmetry-boundary-condition-to-a-surface-that-is-not-truly-planar-what-is-workaround\/"},"modified":"2023-07-31T12:29:58","modified_gmt":"2023-07-31T12:29:58","slug":"getting-error-while-applying-a-symmetry-boundary-condition-to-a-surface-that-is-not-truly-planar-what-is-workaround","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/getting-error-while-applying-a-symmetry-boundary-condition-to-a-surface-that-is-not-truly-planar-what-is-workaround\/","title":{"rendered":"Getting error while applying a symmetry boundary condition to a surface that is not truly planar. What is workaround?"},"content":{"rendered":"<p>Applying a symmetry boundary condition to a surface that is not truly planar will cause an error in the CFX solver. This non-planar condition can be caused either by the geometry or the mesh (e.g. elements not all lying on the surface, which can happen with &#8220;tented&#8221; elements in ICEM Tetra). The workaround is to assign a free-slip wall.  A free-slip wall has all the same attributes of a symmetry surface:  No gradients of velocity normal to wall, and no velocity components normal to the wall.<\/p>\n","protected":false},"template":"","class_list":["post-171059","topic","type-topic","status-publish","hentry","topic-tag-18-1","topic-tag-cfx","topic-tag-fluid-dynamics","topic-tag-general-cfx","topic-tag-symmetry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Applying a symmetry boundary condition to a surface that is not truly planar will cause an error in the CFX solver. This non-planar condition can be caused either by the geometry or the mesh (e.g. elements not all lying on the surface, which can happen with &quot;tented&quot; elements in ICEM Tetra). The workaround is to\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/getting-error-while-applying-a-symmetry-boundary-condition-to-a-surface-that-is-not-truly-planar-what-is-workaround\/\" \/>\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=\"Getting error while applying a symmetry boundary condition to a surface that is not truly planar. What is workaround? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"Applying a symmetry boundary condition to a surface that is not truly planar will cause an error in the CFX solver. This non-planar condition can be caused either by the geometry or the mesh (e.g. elements not all lying on the surface, which can happen with &quot;tented&quot; elements in ICEM Tetra). The workaround is to\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/getting-error-while-applying-a-symmetry-boundary-condition-to-a-surface-that-is-not-truly-planar-what-is-workaround\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-06-05T07:05:36+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-31T12:29:58+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Getting error while applying a symmetry boundary condition to a surface that is not truly planar. What is workaround? | Ansys Knowledge\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Applying a symmetry boundary condition to a surface that is not truly planar will cause an error in the CFX solver. This non-planar condition can be caused either by the geometry or the mesh (e.g. elements not all lying on the surface, which can happen with &quot;tented&quot; elements in ICEM Tetra). The workaround is to\" \/>\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\\\/getting-error-while-applying-a-symmetry-boundary-condition-to-a-surface-that-is-not-truly-planar-what-is-workaround\\\/#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\\\/getting-error-while-applying-a-symmetry-boundary-condition-to-a-surface-that-is-not-truly-planar-what-is-workaround\\\/#listItem\",\"name\":\"Getting error while applying a symmetry boundary condition to a surface that is not truly planar. 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