# Unstable BuoyantBoussinesqSimpleFoam

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 November 29, 2013, 12:13 Unstable BuoyantBoussinesqSimpleFoam #1 Senior Member   jeff osborne Join Date: Mar 2010 Posts: 108 Rep Power: 8 Hello all, I'm trying to solve a relatively simple steady-state heat transfer problem in a duct but I cannot get my solution to converge. I am using the BuoyantBoussinesqSimpleFoam solver. I've been able to get a converged solution using simpleFoam without heat transfer. I have attached a link to my case below. Any help would be greatly appreciated. Thanks! Link to case: http://www.speedyshare.com/hXuEP/R1-...-PR1.84.tar.gz

 November 29, 2013, 12:46 #2 Senior Member   jeff osborne Join Date: Mar 2010 Posts: 108 Rep Power: 8 Something to add to this is that there is clearly something wrong with my calculation of p_rgh, as it does not converge in each iteration. See output below: Code: ```Time = 8 DILUPBiCG: Solving for Ux, Initial residual = 0.0164766, Final residual = 4.00432e-06, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.0539052, Final residual = 1.43627e-05, No Iterations 1 DILUPBiCG: Solving for T, Initial residual = 0.00648091, Final residual = 2.69615e-08, No Iterations 1 DICPCG: Solving for p_rgh, Initial residual = 0.0574019, Final residual = 0.169052, No Iterations 1001 time step continuity errors : sum local = 0.473557, global = -0.000529186, cumulative = -0.00322094 DILUPBiCG: Solving for epsilon, Initial residual = 0.000177516, Final residual = 7.06656e-08, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 0.00285575, Final residual = 1.46059e-06, No Iterations 1 ExecutionTime = 54.25 s ClockTime = 54 s```

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