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-   -   Boussinesq approximation, help please! (http://www.cfd-online.com/Forums/fluent/76274-boussinesq-approximation-help-please.html)

engahmed May 20, 2010 11:25

Boussinesq approximation, help please!
 
Hi,
Can the Boussinesq approximation be emplaoyed in a bouyance flow problem with a temperature difference of about 100 degrees?
The manual says that the Boussinesq approximation is applicable when
B(T-To)<<1 where , B is the coeffecient of thermal expansion, To is the operating temperature.
The fluid in my case is water, and the flow is in a porous medium superimposed by a water layer.
I am not getting convergence, and the residuals keep oscillating. Even when I use a smaller temperature difference.
Any help will be appreciated.
Thank you


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