{"id":45217,"date":"2020-06-18T03:24:36","date_gmt":"2020-06-18T03:24:36","guid":{"rendered":"\/forum\/forums\/topic\/why-areaave-and-ave-make-a-difference-for-2d-simulation\/"},"modified":"2020-06-18T03:24:36","modified_gmt":"2020-06-18T03:24:36","slug":"why-areaave-and-ave-make-a-difference-for-2d-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-areaave-and-ave-make-a-difference-for-2d-simulation\/","title":{"rendered":"Why areaAve and ave make a difference for 2D simulation"},"content":{"rendered":"<p>I got <strong>different mean velocities using ave and areaAve<\/strong> for <strong>2D<\/strong> geometry<strong>, <\/strong>which I don&#8217;t know why.&nbsp;&nbsp;<\/p>\n<p><\/p>\n<p>Please see the figure below. Inlet velocity is 0.1m\/s.&nbsp; I want to&nbsp;find out mean velocity (u component) at outlet.&nbsp;<\/p>\n<p><\/p>\n<p>I got different mean values using ave and areaAve:<\/p>\n<p><\/p>\n<p>(1) ave(Velocity u)@outlet=0.0677 m\/s<\/p>\n<p><\/p>\n<p>(2)&nbsp; areaAve(Velocity u)@outlet=0.1 m\/s<\/p>\n<p><\/p>\n<p>Since inlet velocity is 0.1m\/s, so I know the result using areaAve is correct. But what causes the difference?<\/p>\n<p><\/p>\n<p>Based on my understand, ave is simply arithmetic average, and areaAve is area-weighted average. Yet in this 2D simulation, I don&rsquo;t understand why ave and areaAve make a difference.<\/p>\n<p><\/p>\n<p>Please advise. Thank you very much.&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/5853c5e6-3d43-4a8c-b7b2-aa4500f0d4d8\/bdfc50e8-c689-4432-84c4-abde0105eb2f_pipe2d.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-45217","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["17398"],"_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":["842"],"_bbp_subscription":["240087"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["45217"],"_bbp_forum_id":["27792"],"_bbp_engagement":["25","165116"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["118311"],"_bbp_last_active_id":["118311"],"_bbp_last_active_time":["2020-06-19 13:44:37"]},"test":"alexc"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/45217","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\/45217\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=45217"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}