Natural convection Flows

[smukthiHT]

Hi All,

I am trying to understand equations used by CFD solvers in solving an external flow Natural convection problem.
I know for computing the density variation term in the momentum equation they have 2 approaches; 1 Boussinesq approximation 2. Ideal gas law.
I am pretty familiar with Boussinesq approximation and assumptions that go into it.
I have 2 questions:
1. Not sure how Ideal gas is used to compute the density variation term in Momentum equation. Can you please comment?
2. Pros and cons of Boussinesq when compared to Ideal gas law? Which one is better.

Really appreciate your help!

Thanks
Sridhar

 

[IRstuff]

The fact that they both exist kind of tells you the answer, doesn't it?

TTFN
faq731-376

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[smukthiHT]

No. Csn u please explain.
Thanks