{"id":388396,"date":"2024-10-07T13:38:22","date_gmt":"2024-10-07T13:38:22","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/turbulent-thermal-conductivity\/"},"modified":"2024-10-07T13:38:22","modified_gmt":"2024-10-07T13:38:22","slug":"turbulent-thermal-conductivity","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/turbulent-thermal-conductivity\/","title":{"rendered":"Turbulent Thermal Conductivity"},"content":{"rendered":"<p>&lt;p&gt;Hi all&lt;\/p&gt;&lt;p&gt;I am using ANSYS FLUENT to model heat transfer in a pipe with a low Pr gas&lt;\/p&gt;&lt;p&gt;Since the typical constant value of turbulent Prandtl = 0.85 is no longer valid in this situation, a custom UDF must be built&lt;\/p&gt;&lt;p&gt;I noticed that there are several DEFINE_PRANDTL UDFs, but I suppose the one I must target is DEFINE_PRANDTL_T&lt;\/p&gt;&lt;p&gt;However, it seems that it is not doing exactly what I am telling him to do&lt;\/p&gt;&lt;p&gt;Is there a way to directly modify the turbulent conductivity or diffusivity, such as making it possible for turbulent viscosity?&lt;\/p&gt;&lt;p&gt;Thanks&nbsp;&lt;\/p&gt;&lt;p&gt;David&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-388396","topic","type-topic","status-publish","hentry","topic-tag-effective-conductivity-1","topic-tag-heat-transfer","topic-tag-prandtl-number","topic-tag-thermal-conductivity","topic-tag-udf"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi allI am using ANSYS FLUENT to model heat transfer in a pipe with a low Pr gasSince the typical constant value of turbulent Prandtl = 0.85 is no longer valid in this situation, a custom UDF must be builtI noticed that there are several DEFINE_PRANDTL UDFs, but I suppose the one I must target\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" 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