{"id":303976,"date":"2023-08-29T21:00:45","date_gmt":"2023-08-29T21:00:45","guid":{"rendered":"\/forum\/forums\/topic\/setting-inlet-and-outlet-pressure-in-fluent-for-fan-zone-with-air-gaps\/"},"modified":"2023-08-29T21:00:45","modified_gmt":"2023-08-29T21:00:45","slug":"setting-inlet-and-outlet-pressure-in-fluent-for-fan-zone-with-air-gaps","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/setting-inlet-and-outlet-pressure-in-fluent-for-fan-zone-with-air-gaps\/","title":{"rendered":"Setting inlet and outlet pressure in Fluent for fan zone with air gaps"},"content":{"rendered":"<p>Hi,<\/p>\n<p>I&#8217;m modeling an axial fan with some air gaps in Fluent, as shown in the picture below. The blades are set to be rotating, and there are some air gaps surrounding the fan. The model has two cylinder inlet and outlet ducts, and the inlet and outlet are set on the two sides of the ducts. I&#8217;m trying to simulate the reverse flow in the air gap. Both the inlet and outlet should be atmospheric pressure, and the fan zone will create a pressure rise across it, which pushes some air exiting the fan zone to enter the air gaps and flow back to the inlet side. However, I&#8217;m having trouble simulating this scenario in Fluent. Since the pressure inlet boundary condition only sets the total pressure at the inlet, the inlet static pressure can&#8217;t be set to 0. I&#8217;ve also tried using velocity inlet or mass flow inlet. The result shows large pressure at the fan inlet side, and the flow in the air gaps is in the same direction as the flow in the fan zone. How should I set the inlet and outlet boundary conditions so that there&#8217;s atmosphere pressure on both sides? Any help is appreciated. Thanks!<\/p>\n<p><img decoding=\"async\" style=\"font-size: 14pt\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/29-08-2023-1693340944-mceclip0.png\"><\/p>\n","protected":false},"template":"","class_list":["post-303976","topic","type-topic","status-closed","hentry","topic-tag-fluent-cfd-ansys-1","topic-tag-axial-fan","topic-tag-boundary-conditions","topic-tag-Inletboundaryconditions-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["21384","18096"],"_bbp_author_ip":["23.52.43.81"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["2648"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["303976"],"_bbp_forum_id":["27792"],"_bbp_engagement":["18096","21384"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["306226"],"_bbp_last_active_id":["306226"],"_bbp_last_active_time":["2023-09-11 22:00:26"]},"test":"lzhang"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/303976","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\/303976\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=303976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}