{"id":381505,"date":"2024-09-04T09:35:04","date_gmt":"2024-09-04T09:35:04","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/lower-total-surface-heat-flux-with-a-finer-mesh\/"},"modified":"2024-09-04T09:35:04","modified_gmt":"2024-09-04T09:35:04","slug":"lower-total-surface-heat-flux-with-a-finer-mesh","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/lower-total-surface-heat-flux-with-a-finer-mesh\/","title":{"rendered":"Lower total surface heat flux with a finer mesh"},"content":{"rendered":"<p>&lt;p&gt;Hello!&lt;\/p&gt;&lt;p&gt;I&#8217;m making a mesh sensitivity analisys for a solar air heater (utilizing solar calculator with a montecarlo model for radiation in fluent solver) and a phase change material for energy storage during &#8220;nigth&#8221;. One of the parameters I was getting for comparison between mesh refinements was the &#8216;phase change materials walls total heat flux&#8217; trougth the simulation, but for every mesh refinement the &#8216;phase change materials walls total heat flux&#8217; gets lower and lower, to the point that i started with a 200 w\/m&sup2; with a coarse mesh (Element Size of 50mm and a total of 3200 elemets) and with a refined mesh utilizing inflation in the heat transfer area for more accuracy I obteined a 4 w\/m&sup2; utilizing all the same configuration for fluent solver only the mesh refinement changed (Element Size of 10mm, inflation and a total of 1027329 elemets).&lt;\/p&gt;&lt;p&gt;Does someone know why this is happening?&nbsp;&lt;\/p&gt;&lt;p&gt;I have looked up in ansys user guide &#8220;26.1. Fluxes Through Boundaries&#8221; but I could not find a answer for my question.&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/04-09-2024-1725442217-inflated mesh.png\" alt=\"\" width=\"1040\" height=\"497\" \/>&lt;\/p&gt;&lt;p&gt;Attached a image of the refined mesh with inflation in the separation between the air canal (gray) and the PCM thermal energy storage (blue).&lt;\/p&gt;&lt;p&gt;Thanks!!&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-381505","topic","type-topic","status-publish","hentry","topic-tag-fluent-mesh","topic-tag-heat-flux","topic-tag-heatflux-1","topic-tag-mesh-refinement","topic-tag-Meshsensitivity-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["451268","39507"],"_bbp_author_ip":["193.136.195.4"],"_btv_view_count":["263"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["381505"],"_bbp_forum_id":["27792"],"_bbp_engagement":["39507","451268"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["381704"],"_bbp_last_active_id":["381704"],"_bbp_last_active_time":["2024-09-06 07:47:26"]},"test":"nickolas-giacomittigmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/381505","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\/381505\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=381505"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}