[AhmedHafez]

Hello foamers,

I try to simulate flow around a cylinder using pimpleFoam and kOmegaSST model.
I set the residual control to 1e-6 for all variables and turn turbOnFinalIterOnly to false to correct turbulence in every iteration.

The issue is that as you can see the residual generally increase for p in the final iteration, as compared with the previous ones.

p initial residual at iteration 15 = 2.76799e-06
p initial residual at iteration 16 = 1.851e-06
p initial residual at iteration 17 = 1.25194e-06
p initial residual at iteration 18 = 8.59642e-07
p initial residual at iteration 19 = 0.000184078

Does anyone have an idea why this happens?

PIMPLE: iteration 15
smoothSolver:  Solving for Ux, Initial residual = 2.75291e-08, Final residual = 2.24998e-11, No Iterations 1
smoothSolver:  Solving for Uy, Initial residual = 5.35638e-08, Final residual = 6.11208e-11, No Iterations 1
GAMG:  Solving for p, Initial residual = 0.000341863, Final residual = 2.37683e-07, No Iterations 9
GAMG:  Solving for p, Initial residual = 3.95414e-06, Final residual = 6.59996e-09, No Iterations 13
time step continuity errors : sum local = 6.0944e-14, global = 5.61034e-15, cumulative = -1.08138e-09
GAMG:  Solving for p, Initial residual = 0.000239169, Final residual = 1.64455e-07, No Iterations 9
GAMG:  Solving for p, Initial residual = 2.76799e-06, Final residual = 7.47063e-09, No Iterations 11
time step continuity errors : sum local = 6.89837e-14, global = 6.11525e-15, cumulative = -1.08137e-09
smoothSolver:  Solving for omega, Initial residual = 9.76609e-09, Final residual = 9.76609e-09, No Iterations 0
smoothSolver:  Solving for k, Initial residual = 4.70179e-09, Final residual = 4.70179e-09, No Iterations 0
PIMPLE: iteration 16
smoothSolver:  Solving for Ux, Initial residual = 1.73465e-08, Final residual = 1.37002e-11, No Iterations 1
smoothSolver:  Solving for Uy, Initial residual = 3.46011e-08, Final residual = 3.73245e-11, No Iterations 1
GAMG:  Solving for p, Initial residual = 0.000233972, Final residual = 1.56529e-07, No Iterations 9
GAMG:  Solving for p, Initial residual = 2.6403e-06, Final residual = 7.97251e-09, No Iterations 11
time step continuity errors : sum local = 7.36173e-14, global = 6.4906e-15, cumulative = -1.08137e-09
GAMG:  Solving for p, Initial residual = 0.000163756, Final residual = 1.09107e-07, No Iterations 9
GAMG:  Solving for p, Initial residual = 1.851e-06, Final residual = 9.65293e-09, No Iterations 9
time step continuity errors : sum local = 8.91343e-14, global = 7.90999e-15, cumulative = -1.08136e-09
smoothSolver:  Solving for omega, Initial residual = 9.76794e-09, Final residual = 9.76794e-09, No Iterations 0
smoothSolver:  Solving for k, Initial residual = 4.78525e-09, Final residual = 4.78525e-09, No Iterations 0
PIMPLE: iteration 17
smoothSolver:  Solving for Ux, Initial residual = 1.09831e-08, Final residual = 8.19114e-12, No Iterations 1
smoothSolver:  Solving for Uy, Initial residual = 2.23768e-08, Final residual = 2.14394e-11, No Iterations 1
GAMG:  Solving for p, Initial residual = 0.000160724, Final residual = 1.06995e-07, No Iterations 9
GAMG:  Solving for p, Initial residual = 1.78211e-06, Final residual = 9.79957e-09, No Iterations 9
time step continuity errors : sum local = 9.04879e-14, global = 7.90542e-15, cumulative = -1.08135e-09
GAMG:  Solving for p, Initial residual = 0.000112516, Final residual = 7.48168e-08, No Iterations 9
GAMG:  Solving for p, Initial residual = 1.25194e-06, Final residual = 6.99889e-09, No Iterations 9
time step continuity errors : sum local = 6.46267e-14, global = 5.6232e-15, cumulative = -1.08135e-09
smoothSolver:  Solving for omega, Initial residual = 9.769e-09, Final residual = 9.769e-09, No Iterations 0
smoothSolver:  Solving for k, Initial residual = 4.83968e-09, Final residual = 4.83968e-09, No Iterations 0
PIMPLE: iteration 18
smoothSolver:  Solving for Ux, Initial residual = 7.00153e-09, Final residual = 7.00153e-09, No Iterations 0
smoothSolver:  Solving for Uy, Initial residual = 1.45239e-08, Final residual = 1.21031e-11, No Iterations 1
GAMG:  Solving for p, Initial residual = 0.000110597, Final residual = 7.40441e-08, No Iterations 9
GAMG:  Solving for p, Initial residual = 1.21414e-06, Final residual = 6.73644e-09, No Iterations 9
time step continuity errors : sum local = 6.22032e-14, global = 5.38254e-15, cumulative = -1.08134e-09
GAMG:  Solving for p, Initial residual = 7.74651e-05, Final residual = 5.18999e-08, No Iterations 9
GAMG:  Solving for p, Initial residual = 8.59642e-07, Final residual = 7.5714e-09, No Iterations 7
time step continuity errors : sum local = 6.9913e-14, global = 8.17829e-15, cumulative = -1.08133e-09
smoothSolver:  Solving for omega, Initial residual = 9.76963e-09, Final residual = 9.76963e-09, No Iterations 0
smoothSolver:  Solving for k, Initial residual = 4.87472e-09, Final residual = 4.87472e-09, No Iterations 0
PIMPLE: iteration 19
smoothSolver:  Solving for Ux, Initial residual = 6.63675e-09, Final residual = 6.63675e-09, No Iterations 0
smoothSolver:  Solving for Uy, Initial residual = 1.44178e-08, Final residual = 2.26225e-11, No Iterations 1
GAMG:  Solving for p, Initial residual = 0.111005, Final residual = 9.15593e-05, No Iterations 10
GAMG:  Solving for p, Initial residual = 0.00170707, Final residual = 1.29047e-06, No Iterations 24
time step continuity errors : sum local = 1.46577e-11, global = -1.53446e-12, cumulative = -1.08287e-09
GAMG:  Solving for p, Initial residual = 0.00682859, Final residual = 6.35587e-06, No Iterations 11
GAMG:  Solving for p, Initial residual = 0.000184078, Final residual = 9.50223e-09, No Iterations 30
time step continuity errors : sum local = 1.08533e-13, global = -1.11373e-14, cumulative = -1.08288e-09
smoothSolver:  Solving for omega, Initial residual = 2.54325e-08, Final residual = 3.38142e-09, No Iterations 1
smoothSolver:  Solving for k, Initial residual = 4.09102e-07, Final residual = 2.37969e-09, No Iterations 1
PIMPLE: converged in 19 iterations
ExecutionTime = 251702 s  ClockTime = 253133 s