{"id":162895,"date":"2021-10-07T15:39:11","date_gmt":"2021-10-07T15:39:11","guid":{"rendered":"\/forum\/forums\/topic\/inlet-boundary-condition-definition-for-quiescent-air-flow\/"},"modified":"2021-10-20T10:11:54","modified_gmt":"2021-10-20T10:11:54","slug":"inlet-boundary-condition-definition-for-quiescent-air-flow","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/inlet-boundary-condition-definition-for-quiescent-air-flow\/","title":{"rendered":"Inlet boundary condition definition for quiescent air flow"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>My geometry consists of a porous zone region (R=2m) that pulls air from a R=25m hemispherical inlet plenum and exhausts through a pipe originating from the center of the pile. Source terms are applied in the fan subvolume to achieve the desired flow rate. Gravity is turned on since I will eventually replace the porous region with a DEM packed bed geometry.<\/p>\n<p>I want to simulate the inlet plenum with quiescent air and believe a total pressure inlet boundary condition is the correct choice; however, I am uncertain if I should specify total pressure as constant 0 Pa(g) or -gravity*density*y. Both options give something similar to the shown vector plot that has the bulk of the streamlines hitting the pile originating from the top of the hemisphere.<\/p>\n<p>My expectation is that the stream function in the plenum should be characteristic of a line sink (psi = m*theta) and therefore am suspicious of the inlet boundary condition definition. Thoughts?<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/729\/QTDYGPMR0MCV.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/729\/QTDYGPMR0MCV.png\" alt=\"geometry_r2.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-162895","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":["1076"],"_bbp_likes_count":["0"],"_bbp_subscription":["255839"],"_bbpmt_movedon":["2022-08-26 07:15:40"],"_bbpmt_movedfrom":["27819"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["162895"],"_bbp_forum_id":["27792"],"_bbp_engagement":["25","199","181711"],"_bbp_voice_count":["3"],"_bbp_reply_count":["5"],"_bbp_last_reply_id":["194215"],"_bbp_last_active_id":["194215"],"_bbp_last_active_time":["2021-10-20 10:11:54"]},"test":"dcerantola"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/162895","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\/162895\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=162895"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}