{"id":393380,"date":"2024-11-08T19:20:35","date_gmt":"2024-11-08T19:20:35","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/volumetric-mesh-with-cell-volumes-smaller-than-machine-precision\/"},"modified":"2024-11-19T10:45:28","modified_gmt":"2024-11-19T10:45:28","slug":"volumetric-mesh-with-cell-volumes-smaller-than-machine-precision","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/volumetric-mesh-with-cell-volumes-smaller-than-machine-precision\/","title":{"rendered":"Volumetric mesh with cell volumes smaller than machine precision"},"content":{"rendered":"<p>&lt;p&gt;My y+ =10, gives me a cell height that is very small 2&#215;10^-6. This is due to my fluid speed and choice of fluid.&nbsp;&lt;\/p&gt;&lt;p&gt;When making a volumetric mesh, this gives me a cell volume that is well below machine precision (see cut out below of cell volume in mesh). The mesh has a 200 million point cell count, and the conservation variables are exponentially increasing. I suspect this is due to the volumetric size since the flow field &#8220;jumps&#8221; in areas that look like my grid (flow field below).&nbsp;&lt;\/p&gt;&lt;p&gt;My questions are as follows:&lt;\/p&gt;<\/p>\n<ul>\n<li>Does ANSYS have a way to handle these cell volumes? If not, is there a scaling function that users can employ such that the boundary-conditions are also scaled?<\/li>\n<li>How well can ANSYS solve a volumetric domain that is comprised of structured and unstructured grids?&nbsp;<\/li>\n<\/ul>\n<p>&lt;p&gt;thank you so much!&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/11\/08-11-2024-1731093620-mceclip1.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-393380","topic","type-topic","status-publish","hentry","topic-tag-fluent-mesh"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"My y+ =10, gives me a cell height that is very small 2x10^-6. This is due to my fluid speed and choice of fluid. When making a volumetric mesh, this gives me a cell volume that is well below machine precision (see cut out below of cell volume in mesh). The mesh has a 200 million\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/volumetric-mesh-with-cell-volumes-smaller-than-machine-precision\/\" \/>\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=\"Volumetric mesh with cell volumes smaller than machine precision | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"My y+ =10, gives me a cell height that is very small 2x10^-6. This is due to my fluid speed and choice of fluid. When making a volumetric mesh, this gives me a cell volume that is well below machine precision (see cut out below of cell volume in mesh). The mesh has a 200 million\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/volumetric-mesh-with-cell-volumes-smaller-than-machine-precision\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-11-08T19:20:35+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-11-19T10:45:28+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Volumetric mesh with cell volumes smaller than machine precision | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"My y+ =10, gives me a cell height that is very small 2x10^-6. This is due to my fluid speed and choice of fluid. When making a volumetric mesh, this gives me a cell volume that is well below machine precision (see cut out below of cell volume in mesh). The mesh has a 200 million\" \/>\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\\\/volumetric-mesh-with-cell-volumes-smaller-than-machine-precision\\\/#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\\\/fluent-mesh\\\/#listItem\",\"name\":\"fluent-mesh\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/fluent-mesh\\\/#listItem\",\"position\":3,\"name\":\"fluent-mesh\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/fluent-mesh\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/volumetric-mesh-with-cell-volumes-smaller-than-machine-precision\\\/#listItem\",\"name\":\"Volumetric mesh with cell volumes smaller than machine precision\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/volumetric-mesh-with-cell-volumes-smaller-than-machine-precision\\\/#listItem\",\"position\":4,\"name\":\"Volumetric mesh with cell volumes smaller than machine precision\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic-tag\\\/fluent-mesh\\\/#listItem\",\"name\":\"fluent-mesh\"}}]},{\"@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\\\/volumetric-mesh-with-cell-volumes-smaller-than-machine-precision\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/volumetric-mesh-with-cell-volumes-smaller-than-machine-precision\\\/\",\"name\":\"Volumetric mesh with cell volumes smaller than machine precision | Ansys Learning Forum\",\"description\":\"My y+ =10, gives me a cell height that is very small 2x10^-6. 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