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Old   September 12, 2013, 08:36
Default BuoyantBoussinesqSimpleFoam solution diverging
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Eshita Pal
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Hi all

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?
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File Type: txt log.txt (9.9 KB, 2 views)
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Old   September 13, 2013, 16:15
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Joachim Herb
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I think this was already discussed in Introducing polynomial thermophysical properties
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.
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buoyanboussinesqsimple, natural convection, time step continuity

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