Hello dear ANSYS community.<\/p>\n
<\/p>\n
I am performing mass conservation check for my ANSYS FLUENT 2019R2 air-water 3D flow simulation in vertical pipe (done with Eulerian model).<\/p>\n
<\/p>\n
I ran my simulation –> during the simulation there wasn’t reversed flow at the outlet –> once the simulation was completed I compared mass flow rates at the inlet and at the outlet.<\/p>\n
<\/p>\n
I got that the magnitudes of the mass flow rates were almost the same (within the accepted tolerance region) – but they had different signs!<\/p>\n
<\/p>\n
My flow is laminar and vertical (mostly one directional – though it is 3D). My pipe is aligned with the Y axis. My flow is in the positive Y direction. Therefore my mass flow rates must be positive. Still my mass flow rate at the inlet is positive and my mass flow rate at the outlet is negative – but their magnitudes are equal.<\/p>\n
<\/p>\n
My boundary conditions are:<\/p>\n
<\/p>\n
– pressure outlet<\/p>\n
<\/p>\n
– velocity inlet (I specified velocity as “magnitude, normal to the boundary” – I am pretty sure that’s the problem because outward normal vectors for the inlet and outlet boundaries are obviously in the opposite directions).<\/p>\n
<\/p>\n
I was wondering if anybody could help me please to understand whether it is some sort of ANSYS technical issue or my simulation is wrong and I do in fact have reversed flow at the outlet.<\/p>\n
<\/p>\n
I am ready to provide additional information upon request.<\/p>\n
<\/p>\n
Thank you in advance.<\/p>\n
<\/p>\n
Ivan<\/p>\n","protected":false},"template":"","class_list":["post-42436","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["14616"],"_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":["1792"],"_bbp_subscription":["244333"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["42436"],"_bbp_forum_id":["27792"],"_bbp_engagement":["62","169961"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["110216"],"_bbp_last_active_id":["110216"],"_bbp_last_active_time":["2020-04-06 03:38:31"]},"test":"nepomnyi"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/42436","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\/42436\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=42436"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}