# Rayleigh-Benard problem with buoyanBoussinesqSimpleFoam

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 April 30, 2011, 16:28 Rayleigh-Benard problem with buoyanBoussinesqSimpleFoam #1 Member   Logan Page Join Date: Sep 2010 Posts: 38 Rep Power: 13 Hi Foamers 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 H= 1 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, 10:17 Rayleigh benard convection #2 New Member   narayana vekamulla Join Date: Oct 2015 Posts: 15 Rep Power: 8 Did you get the result for convection. i am also doing and struggling to get the results ?

 March 13, 2016, 13:47 #3 Member   Thomas Boucheres Join Date: May 2013 Posts: 41 Rep Power: 10 Hello, 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.

 Tags boussinesqsimplefoam, dimensionless, rayleigh-benard