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Old   June 23, 2003, 05:30
Default Thermal expansivity
Atit Koonsrisuk
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I am solving the problem about natural convection. I have set that there is the buoyancy effect when I define fluid model. I choose 'Air Ideal Gas' as the domain fluid. When I tried to modify some property of the template fluid, I found that in 'buoyancy property' of ideal gas the thermal expansivity is not specify explicitly. I would like to know that if I choose template 'Air Ideal Gas' as the domain fluid, and CFX have to use thermal expansivity in computation, what value of thermal expansivity will be used? Thank you.

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Old   June 26, 2003, 16:13
Default Re: Thermal expansivity
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When using an ideal gas, the full buoyancy model is automatically set. Thermal expansivity is used only for the Boussinesq buoyancy model.
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