{"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":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello!I&#039;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 &quot;nigth&quot;. 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