{"id":166075,"date":"2023-03-17T13:10:58","date_gmt":"2023-03-17T13:10:58","guid":{"rendered":"\/knowledge\/forums\/topic\/for-flows-with-volumetric-forces-like-gravity-with-temperature-dependent-density-velocity-shows-unphysical-behavior-at-walls-vectors-are-pointing-outwards-through-the-wall-why\/"},"modified":"2023-07-31T12:27:16","modified_gmt":"2023-07-31T12:27:16","slug":"for-flows-with-volumetric-forces-like-gravity-with-temperature-dependent-density-velocity-shows-unphysical-behavior-at-walls-vectors-are-pointing-outwards-through-the-wall-why","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/for-flows-with-volumetric-forces-like-gravity-with-temperature-dependent-density-velocity-shows-unphysical-behavior-at-walls-vectors-are-pointing-outwards-through-the-wall-why\/","title":{"rendered":"For flows with volumetric forces (like gravity with temperature dependent density) velocity shows unphysical behavior at walls &#8211; vectors are pointing outwards through the wall, why?"},"content":{"rendered":"<p>The standard scheme for spatial discretization is &#8220;second order&#8221; or &#8220;standard&#8221; (in older versions). These scheme is not appropriate for flows with e. g. natural convection (buoyancy driven flow). It can lead to vectors pointing through the upper walls instead of a flow parallel to the wall (see attached picture 2039992_Second_Order_Vectors.jpg in the upper left and right corner). Use PRESTO or Body Force Weighted instead (see 2039992_PRESTO_Vectors.jpg and 2039992_BFW_Vectors.jpg).  WB project is also attached. <\/p>\n<p>Attachments:<br \/>\n1. <a href=https:\/\/ansys13.ansys.com\/KnowledgeArticles\/Phase-1\/2039992\/2039992.zip>2039992.zip<\/a><br \/>\n2. <a href= https:\/\/ansys13.ansys.com\/KnowledgeArticles\/Phase-1\/2039992\/2039992_BFW_Vectors.jpg>2039992_BFW_Vectors.jpg<\/a><br \/>\n3. <a href= https:\/\/ansys13.ansys.com\/KnowledgeArticles\/Phase-1\/2039992\/2039992_PRESTO_Vectors.jpg>2039992_PRESTO_Vectors.jpg<\/a><br \/>\n4. <a href= https:\/\/ansys13.ansys.com\/KnowledgeArticles\/Phase-1\/2039992\/2039992_Second_Order_Vectors.jpg>2039992_Second_Order_Vectors.jpg<\/a><\/p>\n","protected":false},"template":"","class_list":["post-166075","topic","type-topic","status-publish","hentry","topic-tag-16-1","topic-tag-fluent","topic-tag-fluid-dynamics","topic-tag-general","topic-tag-general-fluent","topic-tag-heattransfer"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"The standard scheme for spatial discretization is &quot;second order&quot; or &quot;standard&quot; (in older versions). These scheme is not appropriate for flows with e. g. natural convection (buoyancy driven flow). It can lead to vectors pointing through the upper walls instead of a flow parallel to the wall (see attached picture 2039992_Second_Order_Vectors.jpg in the upper left\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/for-flows-with-volumetric-forces-like-gravity-with-temperature-dependent-density-velocity-shows-unphysical-behavior-at-walls-vectors-are-pointing-outwards-through-the-wall-why\/\" \/>\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=\"For flows with volumetric forces (like gravity with temperature dependent density) velocity shows unphysical behavior at walls \u2013 vectors are pointing outwards through the wall, why? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"The standard scheme for spatial discretization is &quot;second order&quot; or &quot;standard&quot; (in older versions). These scheme is not appropriate for flows with e. g. natural convection (buoyancy driven flow). It can lead to vectors pointing through the upper walls instead of a flow parallel to the wall (see attached picture 2039992_Second_Order_Vectors.jpg in the upper left\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/for-flows-with-volumetric-forces-like-gravity-with-temperature-dependent-density-velocity-shows-unphysical-behavior-at-walls-vectors-are-pointing-outwards-through-the-wall-why\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2023-03-17T13:10:58+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2023-07-31T12:27:16+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"For flows with volumetric forces (like gravity with temperature dependent density) velocity shows unphysical behavior at walls \u2013 vectors are pointing outwards through the wall, why? | Ansys Knowledge\" \/>\n\t\t<meta name=\"twitter:description\" content=\"The standard scheme for spatial discretization is &quot;second order&quot; or &quot;standard&quot; (in older versions). These scheme is not appropriate for flows with e. g. natural convection (buoyancy driven flow). It can lead to vectors pointing through the upper walls instead of a flow parallel to the wall (see attached picture 2039992_Second_Order_Vectors.jpg in the upper left\" \/>\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\\\/for-flows-with-volumetric-forces-like-gravity-with-temperature-dependent-density-velocity-shows-unphysical-behavior-at-walls-vectors-are-pointing-outwards-through-the-wall-why\\\/#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\\\/fluent\\\/#listItem\",\"name\":\"fluent\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/fluent\\\/#listItem\",\"position\":3,\"name\":\"fluent\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/fluent\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/for-flows-with-volumetric-forces-like-gravity-with-temperature-dependent-density-velocity-shows-unphysical-behavior-at-walls-vectors-are-pointing-outwards-through-the-wall-why\\\/#listItem\",\"name\":\"For flows with volumetric forces (like gravity with temperature dependent density) velocity shows unphysical behavior at walls &#8211; vectors are pointing outwards through the wall, why?\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/for-flows-with-volumetric-forces-like-gravity-with-temperature-dependent-density-velocity-shows-unphysical-behavior-at-walls-vectors-are-pointing-outwards-through-the-wall-why\\\/#listItem\",\"position\":4,\"name\":\"For flows with volumetric forces (like gravity with temperature dependent density) velocity shows unphysical behavior at walls &#8211; vectors are pointing outwards through the wall, why?\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic-tag\\\/fluent\\\/#listItem\",\"name\":\"fluent\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/#organization\",\"name\":\"Ansys Knowledge\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/for-flows-with-volumetric-forces-like-gravity-with-temperature-dependent-density-velocity-shows-unphysical-behavior-at-walls-vectors-are-pointing-outwards-through-the-wall-why\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/knowledge\\\/forums\\\/topic\\\/for-flows-with-volumetric-forces-like-gravity-with-temperature-dependent-density-velocity-shows-unphysical-behavior-at-walls-vectors-are-pointing-outwards-through-the-wall-why\\\/\",\"name\":\"For flows with volumetric forces (like gravity with temperature dependent density) velocity shows unphysical behavior at walls \\u2013 vectors are pointing outwards through the wall, why? | Ansys Knowledge\",\"description\":\"The standard scheme for spatial discretization is \\\"second order\\\" or \\\"standard\\\" (in older versions). 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