[Akuji]

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:

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?

[Akuji]

nobody knows?

[Akuji]

Originally Posted by daffodil1003

Thank you so much for the post.

But...what about answer?