{"id":38116,"date":"2019-10-04T10:22:40","date_gmt":"2019-10-04T10:22:40","guid":{"rendered":"\/forum\/forums\/topic\/fluent-boundary-conditions-contact-regions-walls-and-shadows\/"},"modified":"2019-10-04T10:22:40","modified_gmt":"2019-10-04T10:22:40","slug":"fluent-boundary-conditions-contact-regions-walls-and-shadows","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-boundary-conditions-contact-regions-walls-and-shadows\/","title":{"rendered":"Fluent boundary conditions: contact regions, walls and shadows"},"content":{"rendered":"<p>Hello everyone,<\/p>\n<p><\/p>\n<p>Ansys beginner here. I&#8217;m practicing with heat transfer, and I have a problem I can&#8217;t seem to do right. I have a solid cylinder (rotor) inside of a cylindrical shell (stator) which will be cooled by water (fluid) that flows axially inside the &#8220;water jacket&#8221;. The rotor will be generating 30W of heat (8153.3 W\/m^3) and the stator will be generating 350 W (100981 W\/m^3). The solid parts are made of steel with K=16 W\/m.K. Water will be flowing in at a rate of 0.06615 kg\/s, entering an leaving at atmospheric pressure. The convection coefficient between the stator outer surface and the fluid is 115 W\/m^2.K. As a condition, I want that the surfaces (that are in contact) of rotor and stator are at 80 degC.&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/d43aba6b-a176-4a5e-9cd1-aadc00a1ee7e\/00172639-313c-4a8d-a060-aadc00a8ca2d_rotor-generation.jpg?width=690&amp;upscale=false\" alt=\"heat generation in rotor\"><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/d43aba6b-a176-4a5e-9cd1-aadc00a1ee7e\/bc9fcea3-f717-44c8-b1d3-aadc00a8e379_stator-generation.jpg?width=690&amp;upscale=false\" alt=\"heat generation in stator\"><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/d43aba6b-a176-4a5e-9cd1-aadc00a1ee7e\/b0d652e6-1610-4778-ab4c-aadc00a90386_set-temperature.jpg?width=690&amp;upscale=false\" alt=\"wall where I want the temperature to be 80 degC.\"><\/p>\n<p><\/p>\n<p>Up to the meshing, everything is fine. However, I open fluent, I see a lot of walls I know, and that when I click on, don&#8217;t even show because they don&#8217;t exist. I also see a list of contact regions with walls associated. Now I don&#8217;t know to which wall exactly I should assign the temperature values. I tried assigning the values to the walls related to the contact surfaces, but when I run it I get the maxim temperature around 60 degC. (Which cannot be, since I set 80 degC).&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/d43aba6b-a176-4a5e-9cd1-aadc00a1ee7e\/db543778-f2bc-4727-bcdf-aadc00a93a0f_thousand-walls.jpg?width=690&amp;upscale=false\" alt=\"list of contact regions and walls\"><\/p>\n<p><\/p>\n<p>Legend: pink is the jacket, green is the fluid, red is the stator, and orange is the rotor.<\/p>\n<p><\/p>\n<p>I would really appreciate help understanding this walls that Ansys automatically creates. Perhaps I&#8217;m assigning the values wrongly. Thanks a lot in advance!<\/p>\n","protected":false},"template":"","class_list":["post-38116","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["10294"],"_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":["1"],"_btv_view_count":["7210"],"_bbp_subscription":["243509"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["38116"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","240","169084"],"_bbp_voice_count":["3"],"_bbp_reply_count":["7"],"_bbp_last_reply_id":["97874"],"_bbp_last_active_id":["97874"],"_bbp_last_active_time":["2019-11-05 19:36:46"]},"test":"kyshikawa"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/38116","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\/38116\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=38116"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}