{"id":164589,"date":"2023-03-17T08:58:06","date_gmt":"2023-03-17T08:58:06","guid":{"rendered":"\/knowledge\/forums\/topic\/how-does-the-cfx-solver-and-cfx-post-handle-two-boundary-conditions-at-regions-sharing-an-edge\/"},"modified":"2023-07-31T12:25:52","modified_gmt":"2023-07-31T12:25:52","slug":"how-does-the-cfx-solver-and-cfx-post-handle-two-boundary-conditions-at-regions-sharing-an-edge","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-does-the-cfx-solver-and-cfx-post-handle-two-boundary-conditions-at-regions-sharing-an-edge\/","title":{"rendered":"How does the CFX Solver and CFX-Post handle two boundary conditions at regions sharing an edge?"},"content":{"rendered":"<p>The flow solver always uses the exact value specified by the user to calculate the flux through the control volume face on a wall or the inlet when they share an edge (similarly for other combinations of BC&#8217;s). This is because there will be separate control volume faces attached to the wall and inlet for the given  node\/vertex on the shared edge.  Thus, the control volume value is a function of both the wall value and the inlet value (i.e. both values are applied by the flow solver for the same control volume).   The &#8220;hybrid&#8221; value displayed at a node by CFX Post has to be one or the other, and thus is not exactly the boundary condition applied by the flow solver.  Hierarchy for plotting in CFD &#8211; POST in such situations for most variables is (in decreasing order):         Inlet, Fluid Solid Interface, Wall, Opening, Outlet, Interface  Hierarchy for pressure:         Outlet, Fluid Solid Interface, Wall, Inlet, Opening, Interface  Hierarchy for wall only values:         Fluid Solid Interface, Wall, all others have same priority<\/p>\n","protected":false},"template":"","class_list":["post-164589","topic","type-topic","status-publish","hentry","topic-tag-4424","topic-tag-cfx","topic-tag-fluid-dynamics","topic-tag-general-cfx"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"The flow solver always uses the exact value specified by the user to calculate the flux through the control volume face on a wall or the inlet when they share an edge (similarly for other combinations of BC&#039;s). This is because there will be separate control volume faces attached to the wall and inlet for\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-does-the-cfx-solver-and-cfx-post-handle-two-boundary-conditions-at-regions-sharing-an-edge\/\" \/>\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=\"How does the CFX Solver and CFX-Post handle two boundary conditions at regions sharing an edge? | Ansys Knowledge\" \/>\n\t\t<meta property=\"og:description\" content=\"The flow solver always uses the exact value specified by the user to calculate the flux through the control volume face on a wall or the inlet when they share an edge (similarly for other combinations of BC&#039;s). 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