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difference between ideal gas & boussinesq approach

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Old   May 18, 2008, 18:44
Default difference between ideal gas & boussinesq approach
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meda
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Dear all, I want to study natural convection in enclosed spaces. In what cases should I use Boussinesq or Ideal gas approach? Which one is more accurate?

Thanks in advance
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Old   May 19, 2008, 06:01
Default Re: difference between ideal gas & boussinesq appr
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Vinayender
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Hi,

Natural convection flow are generaly low speed flow and hence we solve such flows with an Incompresible flow approximation. But Imcompresible flow approximation indicates density is not a function of pressure and temperature. But denstiy varation in Natural convection flows depends on temperature and Hence we incoperate this effect in Incompressible flow solvers that density varies with temperature (which is called as boussinesq approximation) by including buyoncy terms in momentum equations in addition with relation between density and temperature.

Thanks, Vinayender.

TO all :- Please correct this if I am wrong somewere..
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Old   May 19, 2008, 07:12
Default Re: difference between ideal gas & boussinesq appr
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meda
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Thanks a lot Vinayender.

Meda
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