{"id":391924,"date":"2024-10-30T07:35:19","date_gmt":"2024-10-30T07:35:19","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/components-of-flow-direction\/"},"modified":"2024-10-30T07:35:19","modified_gmt":"2024-10-30T07:35:19","slug":"components-of-flow-direction","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/components-of-flow-direction\/","title":{"rendered":"Components of flow direction"},"content":{"rendered":"<p>&lt;p&gt;Hello! A small question about setting boundary conditions in Ansys Fluent. I am trying to model the air movement in the gap between a stationary outer and a rotating (revolutions are known) inner cylinder. Air is supplied with a fixed mass flow uniformly through the side surface (gap) between the cylinders. When setting the air flow through the Mass-Flow-Inlet, you need to specify the Radial, Tangential, Axial components of the flow direction. Please tell me how to correctly calculate these components if the geometry, mass flow and revolutions are known?&lt;br&gt;&lt;br&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/30-10-2024-1730273026-gr1_lrg.jpg\" alt=\"\" width=\"163\" height=\"77\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-391924","topic","type-topic","status-publish","hentry","topic-tag-air-flow","topic-tag-fluent","topic-tag-mass-flow-inlet-boundary-condition-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello! A small question about setting boundary conditions in Ansys Fluent. I am trying to model the air movement in the gap between a stationary outer and a rotating (revolutions are known) inner cylinder. Air is supplied with a fixed mass flow uniformly through the side surface (gap) between the cylinders. When setting the air\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/components-of-flow-direction\/\" \/>\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=\"Components of flow direction | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello! A small question about setting boundary conditions in Ansys Fluent. I am trying to model the air movement in the gap between a stationary outer and a rotating (revolutions are known) inner cylinder. Air is supplied with a fixed mass flow uniformly through the side surface (gap) between the cylinders. When setting the air\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/components-of-flow-direction\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-10-30T07:35:19+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-10-30T07:35:19+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Components of flow direction | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello! A small question about setting boundary conditions in Ansys Fluent. I am trying to model the air movement in the gap between a stationary outer and a rotating (revolutions are known) inner cylinder. Air is supplied with a fixed mass flow uniformly through the side surface (gap) between the cylinders. 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