I am working on natural convection heat transfer in nano fluids flowing inside vertical annulus using Ansys FLUENT 14.0. When i use UDF for viscosity as function of temperature, output results are correct. But When i use UDF for thermal conductivity as function of viscosity and temperature, divergence detected in AMG solver. How this problem can be rectified?
You can define thermal conductivity as a function of temparature only. Because viscosity is also a function of temperature.
Dear Suhail,
Both the thermal conductivity and dynamic viscosity must be defined based on the temperature as you want to employ the variable thermo-physical properties in your simulation. The software will be confused as the thermal conductivity is defined based on two variables.
Regards,
Emad
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