{"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":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["37.55.144.193"],"_btv_view_count":["411"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["199","453091"],"_bbp_topic_id":["391924"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","453091"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["392243"],"_bbp_last_active_id":["392243"],"_bbp_last_active_time":["2024-10-31 12:58:51"]},"test":"warhammer975gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/391924","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/391924\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=391924"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}