|September 12, 2013, 08:36||
BuoyantBoussinesqSimpleFoam solution diverging
Join Date: Mar 2012
Posts: 6Rep Power: 6
I am trying to simulate the shell side flow of a shell and tube heat exchanger using buoyantBoussinesqSimplefoam solver. The boundary conditions are as follows:
Inlet: constant T, constant U, zerograd P
Outlet: zerograd T, zerograd U, p_rgh= 0;
I am using kEpsilon turbulence model.
The simulation diverges after few iterations (bounding epsilon diverges). If I switch off the turbulence model then the time step continuity value diverges. I have attached the log file. When I keep g=0 (i.e. no acc due to gravity) then the simuation converges perfectly. This behaves like forced convection.
Can anyone suggest what is the problem with g on?
|September 13, 2013, 16:15||
Join Date: Sep 2010
Posts: 395Rep Power: 11
I think this was already discussed in http://www.cfd-online.com/Forums/ope...roperties.html
So you probably have to modify or boundary conditions to use automatic switching between inlet and outles.
You could also try the transient BuoyantBoussinesqPimpleFoam solver.
|buoyanboussinesqsimple, natural convection, time step continuity|
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