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Excessively High Temperatures in Natural Convection Simulation

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Old   April 5, 2022, 21:54
Default Excessively High Temperatures in Natural Convection Simulation
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Hey everyone,

I have been trying to develop a steady-state simulation of a solar chimney to determine its ventilation performance. I have modelled the fluid domain as
a rectangular prism geometry orientated vertically with a pressure inlet and outlet. 3 of the 4 remaining walls I have set as adiabatic (heat flux = 0) whilst the final wall I have set to be my heat source with a constant heat flux (1000 W/m^2).

My issue is that the heated surface is experiencing very high temperatures upwards of 200 C when basic analytical equations and literature are inferring an expected temperature of <60 C. I have tried refining the mesh and changing solving methods however the high temperatures persist. I am using a boussinesq model but I have also tried using polynomial functions for air properties to no avail. Lastly, I am using a laminar model as the expected velocity is low due to the small geometry.

Does anyone have any suggestions on what I might be doing wrong? Or where the issue lies?

Happy to provide more details to further clarify anything

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constant heat flux, fluent, free convection, high temperature, natural convection

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