{"id":34309,"date":"2019-03-28T20:12:57","date_gmt":"2019-03-28T20:12:57","guid":{"rendered":"\/forum\/forums\/topic\/fluent-setting-an-open-boundary\/"},"modified":"2019-03-28T20:12:57","modified_gmt":"2019-03-28T20:12:57","slug":"fluent-setting-an-open-boundary","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-setting-an-open-boundary\/","title":{"rendered":"Fluent- setting an open boundary"},"content":{"rendered":"<p>Hi,<\/p>\n<p><\/p>\n<p>I am setting a 2D-axisymmetric-swirl model. The geometry is a cylinder with two annular co-flow inlets that are somewhere in the middle of the cylinder. Both inlet gases are air, and the study is about flow fields and velocity components.<\/p>\n<p><\/p>\n<p>One end of the cylinder is the outlet boundary, and <strong>the other end<\/strong> is open. My question is about this open boundary. How should I set this boundary type in the model? It cannot be a wall, since it was open during the experimental measurements, so that <strong>air from the room<\/strong> could flow from that boundary. It cannot be an outlet, since then the solver will try to force the fluid to exit from this boundary.<\/p>\n<p><\/p>\n<p>What do you recommend for type of this boundary, and or settings? How about considering an air inlet there (from the room) with a small velocity magnitude that does not disturb the main flow?<\/p>\n<p><\/p>\n<p>Best regards,<\/p>\n<p><\/p>\n<p>Zari<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/65e24d2f-b241-4004-bc7c-a9e301248340\/68662900-b499-46c6-b9be-aa1e014aebeb_2d-view-from-side-lengths-open-boundary.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-34309","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["6481"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0"],"_btv_view_count":["4505"],"_bbp_subscription":["238500"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["34309"],"_bbp_forum_id":["27792"],"_bbp_engagement":["62","162071","162192"],"_bbp_voice_count":["3"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["81631"],"_bbp_last_active_id":["81631"],"_bbp_last_active_time":["2019-03-29 07:18:15"]},"test":"zari"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/34309","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\/34309\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=34309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}