{"id":320309,"date":"2023-11-30T15:43:34","date_gmt":"2023-11-30T15:43:34","guid":{"rendered":"\/forum\/forums\/reply\/320309\/"},"modified":"2023-11-30T15:43:34","modified_gmt":"2023-11-30T15:43:34","slug":"320309","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/320309\/","title":{"rendered":"Reply To: Unrealistic Heat Transfer Coefficient and Total Surface Heat Flux values"},"content":{"rendered":"<p>&lt;p&gt;Hello,&nbsp;&lt;\/p&gt;&lt;p&gt;which HTC are you using in Fluent? If using, Surface Heat Transfer coefficient, this will be based off a reference temperature in your Reference Values. The default is 300 K.&nbsp;For most flows however, a constant reference temperature is not applicable.&lt;\/p&gt;&lt;p&gt;There is also the Wall Function HTC, but this should only be used for average y+ between 30 and 60.&lt;\/p&gt;&lt;p&gt;Finally, since your boundary mesh is fine, you may use the y+ based HTC and Ref. Temperatures. This method uses the temperature found at y+ ~ 300 (again, the 300 value is the default value, but you can change this in References Values). The theory is that when y+ = 300 away from the wall, the fluid temperature approaches the bulk fluid temperature. However, this method may not be applicable on closely spaced fins, where the mesh does not reach y+ away from the walls.&lt;\/p&gt;&lt;p&gt;You can check this article which summarizes this: <a href=\"\/knowledge\/forums\/topic\/defining-heat-transfer-coefficient-htc\/\">Defining heat transfer coefficient (HTC) &#8211; Ansys Knowledge<\/a>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-320309","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/320309","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/320309\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=320309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}