{"id":38091,"date":"2019-10-02T21:45:40","date_gmt":"2019-10-02T21:45:40","guid":{"rendered":"\/forum\/forums\/topic\/local-heat-flux\/"},"modified":"2019-10-02T21:45:40","modified_gmt":"2019-10-02T21:45:40","slug":"local-heat-flux","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/local-heat-flux\/","title":{"rendered":"Local heat flux"},"content":{"rendered":"<p>Hello, I&#8217;m working on the design of a pin fin array and my ultimate goal is to calculate local heat transfer coefficients and heat fluxes. I did a conjugate analysis where I combined solid (picture 1) and fluid (picture 2) domains, inputted the properties for each and obtained a temperature distribution.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/635b8352-81f2-4daf-bb2f-aa7d01546cc2\/f6508664-23a6-4e1b-b441-aada016241c2_q3.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>I am interested in solving for the heat flux in the vicinity of a pin (yellow circle on picture 2) and also near the base of the fin (picture 3)<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/635b8352-81f2-4daf-bb2f-aa7d01546cc2\/17efd6f7-a7af-4406-8934-aada01625755_q1.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/635b8352-81f2-4daf-bb2f-aa7d01546cc2\/33b2d189-ec52-4e5a-9dda-aada0162824c_q2.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>I tried using the iso-surface feature and then clipping it but I got a few problems: the total heat flux area-averaged was lower than I expected so I outputted the data (x,y,z, flux) and it turned out the flux was zero in several locations.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/635b8352-81f2-4daf-bb2f-aa7d01546cc2\/61fe1eda-9e9f-4b58-8dbe-aadd0004362b_w1.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/635b8352-81f2-4daf-bb2f-aa7d01546cc2\/122135a0-aa39-4abd-b843-aadd00061c15_w3.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>So I used the wall itself (shell around the fluid body) to output the flux.<\/p>\n<p><\/p>\n<p>Also, when I was trying to get an average wall temperature, the area average gave me something that was not realistic: I changed the range of the temperature close the entrance to have an idea of what the temperature profile looked like:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/635b8352-81f2-4daf-bb2f-aa7d01546cc2\/3e4d1ba3-dd5d-45c1-8f36-aadd0004d175_w2.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>But the area average calculated was 774K. So I tried the vertex average instead and the results seem more realistic but I am not sure if that is the correct average to use.&nbsp;<\/p>\n<p><\/p>\n<p>Any suggestion is greatly appreciated, thanks!<\/p>\n","protected":false},"template":"","class_list":["post-38091","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["10269"],"_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":["464"],"_bbp_subscription":["241118"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["38091"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","166454"],"_bbp_voice_count":["3"],"_bbp_reply_count":["12"],"_bbp_last_reply_id":["96014"],"_bbp_last_active_id":["96014"],"_bbp_last_active_time":["2019-10-14 12:41:35"]},"test":"niss"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/38091","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\/38091\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=38091"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}