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Negative Nusselt number at a mixed convection simulation

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Old   September 19, 2022, 11:56
Default Negative Nusselt number at a mixed convection simulation
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Mashrur Muntasir Nuhash
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Can anybody suggest to me how to calculate the surface Nusselt number in a mixed convection simulation in Ansys Fluent?

The simulation is a laminar internal flow problem which includes a 1-meter-long pipe with constant heat flux. If I input the volume average of the fluid temperature as reference temperature, the Nusselt number becomes negative. The fluid properties are temperature-dependent. I created a UDF for them.

Thanks in advance. Cheers!
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