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thermal expansion coefficient in FLUENT

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Old   November 21, 2019, 17:13
Default thermal expansion coefficient in FLUENT
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Chaatouf Dounia
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Hello everyone,

my study case is transient natural convection in which I'm using boussinisq density in air property, the problem is in the thermal expansion coefficient.

-I search online, and I found a value of 0.0032 (1/k) for air.
-but I found a tutorial video in YouTube that use 0.036 (1/k),
-when I'm using a value of 0.00032(1/k) I found good results.
so my question is! is it logical if I use 0.00032 ?

and how can I know the right value in my case?

I'll be so grateful for any comments or answers.

Best wishes,

Dounia
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Old   November 21, 2019, 18:07
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Lucky Tran
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For ideal gases, you have \beta = \frac{1}{T} (see Thermal expansion). You can use more real properties if you like.
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