# rho in buoyantSimpleFoam

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 May 17, 2012, 04:01 rho in buoyantSimpleFoam #1 Member   Arina Join Date: Oct 2009 Location: Belarus Posts: 76 Rep Power: 9 Sponsored Links Hello! I try to understand how the solver buoyantSimpleFoam works. I use hotRoom for basis. I create my own geometry with heater and use the same BC. the 1st problem, that residualas are too much (I want to have a residuals ~e-04) The 2nd question is about rho: while iterationg I see in terminal-window: Code: ```DILUPBiCG: Solving for Ux, Initial residual = 0.0141216, Final residual = 0.000127767, No Iterations 1 DILUPBiCG: Solving for Uy, Initial residual = 0.0152304, Final residual = 0.000140921, No Iterations 1 DILUPBiCG: Solving for Uz, Initial residual = 0.0127635, Final residual = 0.000111577, No Iterations 1 DILUPBiCG: Solving for h, Initial residual = 0.000611936, Final residual = 6.79723e-06, No Iterations 1 DICPCG: Solving for p_rgh, Initial residual = 0.00395034, Final residual = 3.77746e-05, No Iterations 33 time step continuity errors : sum local = 2.08489e-06, global = 1.39649e-19, cumulative = 3.59289e-18 rho max/min : 1.18706 1.0768 DILUPBiCG: Solving for epsilon, Initial residual = 0.00028293, Final residual = 2.49851e-05, No Iterations 1 DILUPBiCG: Solving for k, Initial residual = 0.000662009, Final residual = 5.58047e-05, No Iterations 1``` The tabulated values for my boundary conditions for air are: min 1.093 max 1.205 Results for rho calculated by openFOAM very close to tabulated values, but not the same. Does anybody know how OF calculates rho?

 May 21, 2012, 06:51 #2 Member   Arina Join Date: Oct 2009 Location: Belarus Posts: 76 Rep Power: 9 nobody knows?

May 22, 2012, 06:08
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Arina
Join Date: Oct 2009
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Quote:
 Originally Posted by daffodil1003 Thank you so much for the post.

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