|April 30, 2011, 16:28||
Rayleigh-Benard problem with buoyanBoussinesqSimpleFoam
Join Date: Sep 2010
Posts: 38Rep Power: 8
I was wondering if anyone has tried solving the classical Rayleigh-Benard problem with buoyanBoussinesqSimpleFoam?
I have been trying to solve it for the following case:
Laminar, steady-state and 2D flow
free-free boundary condition
Pr = 0.72
Ra = 3000
L = 10
Thot = 1
Tcold = Tref = 0
g = -1
beta = 1
nu = 0.01549193
nu is obtained from the Ra number relationship
nu = 1/(alpha*Ra) = Pr/(nu*Ra)
thus nu = sqrt(Pr/Ra)
From what ive found Ra_crit should be around 657.51, i.e. any Ra number smaller than that will have no convection. Thus for Ra = 3000 i should indeed have convection for this case.
However I am not getting any convection when OpenFOAM solves this case. I get a pure conduction solution with 10 W heat flux at the top and bottom faces. If solved in Fluent i get the correct solution.
Any advise would be appreciated
|March 11, 2016, 11:17||
Rayleigh benard convection
Join Date: Oct 2015
Posts: 13Rep Power: 3
Did you get the result for convection. i am also doing and struggling to get the results ?
|March 13, 2016, 14:47||
Join Date: May 2013
Posts: 38Rep Power: 5
hae a look at the Mukul P. post named "unsteady solver in OpenFoam" (the name is not explicit indeed). Sorry I don't konw to put the link but it is one of the last on the forum.
He looks at the same things than you I guess.
You should work together maybe.
|boussinesqsimplefoam, dimensionless, rayleigh-benard|
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