[Mondal131211]

Hi Foamers,

I am a bit confused about the varying of Rayleigh number during the simulation. Can anyone please explain to me,
What is the simplest parameter to vary Rayleigh number in natural convection?

Note that: I do not want to change my geometry, so there is no chance of changing the length of the plate.

Ra=gB(DletaT)L^3/Nu.alpha

I know all parameter will change Ra number. I also know there is the simplest way to change DeltaT to change Ra number. For that case how can I control B for an ideal gas? In case of an ideal gas, B=1/Tf where Tf is the film temperature. If I change DeltaT each time, do I need to change Tf every time?

Please clear me about this confusion.

Cheers
Razon