| fimbull |
August 1, 2016 10:24 |
Residual control
Well i have a case, in which i will reduce the runtime.
I am using the interPhasechangeDyM Solver
I allredy have reduced the runtime from 100% to 33% with improving the pressure iteration speed.
My Problem is that im iteration the variable p_corr.
In that case I am using these specs below
Code:
"pcorr.*"
{
solver GAMG;
tolerance 1e-4;
relTol 0;
smoother DICGaussSeidel;
cacheAgglomeration no;
nCellsInCoarsestLevel 20;
agglomerator faceAreaPair;
mergeLevels 1;
}
...
PIMPLE
{
momentumPredictor no;
correctPhi yes;
nOuterCorrectors 7;
nCorrectors 1;
nNonOrthogonalCorrectors 10;
residualControl
{
p_rgh
{
tolerance 1e-7;
relTol 0;
absTol 0;
}
}
}
in the first Timestep im getting this
Code:
Execution time for mesh.update() = 2.69 s
GAMG: Solving for pcorr, Initial residual = 1, Final residual = 7.030918589e-05, No Iterations 15
GAMG: Solving for pcorr, Initial residual = 0.1618379063, Final residual = 9.09515451e-05, No Iterations 5
GAMG: Solving for pcorr, Initial residual = 0.03177132081, Final residual = 3.050995536e-05, No Iterations 5
GAMG: Solving for pcorr, Initial residual = 0.01138752385, Final residual = 5.915332199e-05, No Iterations 3
GAMG: Solving for pcorr, Initial residual = 0.004623339973, Final residual = 4.032533298e-05, No Iterations 3
GAMG: Solving for pcorr, Initial residual = 0.002091591789, Final residual = 2.678131328e-05, No Iterations 2
GAMG: Solving for pcorr, Initial residual = 0.000935694126, Final residual = 6.876109491e-05, No Iterations 1
GAMG: Solving for pcorr, Initial residual = 0.0004440894954, Final residual = 3.892454402e-05, No Iterations 1
GAMG: Solving for pcorr, Initial residual = 0.0002179582446, Final residual = 2.564707496e-05, No Iterations 1
GAMG: Solving for pcorr, Initial residual = 0.0001126573963, Final residual = 1.363380582e-05, No Iterations 1
GAMG: Solving for pcorr, Initial residual = 5.807458978e-05, Final residual = 5.807458978e-05, No Iterations 0
time step continuity errors : sum local = 3.835607192e-09, global = 8.465794602e-12, cumulative = 8.465794602e-12
but in the most timesteps after this im getting this
Code:
Execution time for mesh.update() = 2.72 s
GAMG: Solving for pcorr, Initial residual = 1, Final residual = 9.089048299e-05, No Iterations 28
GAMG: Solving for pcorr, Initial residual = 0.0002686212536, Final residual = 4.119209357e-05, No Iterations 1
GAMG: Solving for pcorr, Initial residual = 7.742703334e-05, Final residual = 7.742703334e-05, No Iterations 0
GAMG: Solving for pcorr, Initial residual = 7.742703334e-05, Final residual = 7.742703334e-05, No Iterations 0
GAMG: Solving for pcorr, Initial residual = 7.742703334e-05, Final residual = 7.742703334e-05, No Iterations 0
GAMG: Solving for pcorr, Initial residual = 7.742703334e-05, Final residual = 7.742703334e-05, No Iterations 0
GAMG: Solving for pcorr, Initial residual = 7.742703334e-05, Final residual = 7.742703334e-05, No Iterations 0
GAMG: Solving for pcorr, Initial residual = 7.742703334e-05, Final residual = 7.742703334e-05, No Iterations 0
GAMG: Solving for pcorr, Initial residual = 7.742703334e-05, Final residual = 7.742703334e-05, No Iterations 0
GAMG: Solving for pcorr, Initial residual = 7.742703334e-05, Final residual = 7.742703334e-05, No Iterations 0
GAMG: Solving for pcorr, Initial residual = 7.742703334e-05, Final residual = 7.742703334e-05, No Iterations 0
time step continuity errors : sum local = 1.8005001e-05, global = 4.661703486e-06, cumulative = 4.661711952e-06
Is there any possibility to set a convergence criteria that is only responssible for p_corr and can reduce my -Zero Iterations-? |
