{"id":42312,"date":"2020-04-01T09:22:29","date_gmt":"2020-04-01T09:22:29","guid":{"rendered":"\/forum\/forums\/topic\/remove-backflow\/"},"modified":"2020-04-01T09:22:29","modified_gmt":"2020-04-01T09:22:29","slug":"remove-backflow","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/remove-backflow\/","title":{"rendered":"remove backflow"},"content":{"rendered":"

Hello,<\/span>

I am modelling a body in a 3d mutliphase domain, of water at the bottom and air on top, I am interested in the drag forces on the body which is partially submerged. my velocity inlet is 2 times the length away from the body and the outlet is 4 times length away, I am getting a lot of back flow and the mass flux is very highly positive. I am using symmetry through my body and all other boundaries are over 1L away from the body<\/span>

Any suggestions on ways to reduce the backflow? Ideally zero backflow but that is not always possible, I have attempted to use both outflow and pressure-outlet. I am using the student software more or less to capacity on the number of nodes so very restrained on adding any additional length to the domain.<\/span>

Thanks in advance!<\/span><\/p>\n","protected":false},"template":"","class_list":["post-42312","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["14492"],"_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"],"_btv_view_count":["1938"],"_bbp_subscription":["249141"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["42312"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","174943"],"_bbp_voice_count":["3"],"_bbp_reply_count":["21"],"_bbp_last_reply_id":["110269"],"_bbp_last_active_id":["110269"],"_bbp_last_active_time":["2020-04-06 10:59:01"]},"test":"franke"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/42312","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\/42312\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=42312"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}