{"id":162565,"date":"2021-09-27T01:42:22","date_gmt":"2021-09-27T01:42:22","guid":{"rendered":"\/forum\/forums\/topic\/understanding-fan-boundary-conditions\/"},"modified":"2021-10-03T14:18:23","modified_gmt":"2021-10-03T14:18:23","slug":"understanding-fan-boundary-conditions","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/understanding-fan-boundary-conditions\/","title":{"rendered":"Understanding Fan Boundary Conditions"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>I need to simulate cooling an electronics assembly using Fluent. There will be a fan on the outside of the enclosure drawing air out of it. The inlet is just a louvered area. I need to know how large this louvered are needs to be in order to allow the fan to run at maximum flow rate. I have a fan curve, but when I enter the fan info into the pressure jump box, my solution results always have extremely high velocities, almost an order of magnitude larger than what the fan can do at the given pressure. What am I doing wrong here? I need to have the fan velocity kept in check by the iterated pressure head it is seeing based on the calculations for losses through the inlet louvers. Right now it just jumps to max pressure head, and the corresponding velocity through the fan is extremely high.<\/p>\n<p>My pressure jump parameters using piecewise linear are:<\/p>\n<p>1) 0ft\/s @ 10psi<\/p>\n<p>2) 5ft\/s @ 5psi<\/p>\n<p>3) 10ft\/s @ 0psi<\/p>\n<p>My results are shown below when probed at the exhaust fan outlet:<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/093\/RQYBCO2MC6YT.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/093\/RQYBCO2MC6YT.png\" alt=\"Pressure.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-162565","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_old_reply_author_name_id":["Anonymous"],"_bbp_old_is_reply_anonymous_id":["false"],"_btv_view_count":["4939"],"_bbp_likes_count":["0"],"_bbp_subscription":["254008"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["162565"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","229575"],"_bbp_voice_count":["2"],"_bbp_reply_count":["7"],"_bbp_last_reply_id":["193165"],"_bbp_last_active_id":["193165"],"_bbp_last_active_time":["2021-10-03 14:18:23"]},"test":"rcl5011gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/162565","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\/162565\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=162565"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}