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How do I know if my simulation runs well?

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Old   January 6, 2019, 17:53
Default How do I know if my simulation runs well?
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David
Join Date: Oct 2018
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Hello all,

I am new to CFD-Simulations and after I set up my first case in interFoam I am wondering if my simulation runs to slow. Are there any characteristics I can check to see if the simulations runs with a appropriate speed.

I've already found out that when the Courant Number increases or the deltaT decreases too much that these are good characteristics to see that there is something wrong with some conditions.

For example I'll post some lines of the shell below. For thise Case I first did a simulation with a very coarse mesh which did run quite well without any errors. After if refined the mesh the simulations takes a lot of time and like I said I am not sure if it's just because of the finer mesh or if some boundarie conditions are wrong.

Thanks in advance
David

case.zip

HTML Code:
Courant Number mean: 0.051790448 max: 1.1206113
Interface Courant Number mean: 0.0049403903 max: 0.93649679
deltaT = 0.015620568
Time = 12.8594

PIMPLE: iteration 1
smoothSolver:  Solving for alpha.water, Initial residual = 0.003574985, Final residual = 1.2198356e-009, No Iterations 4
Phase-1 volume fraction = 0.0069168399  Min(alpha.water) = -4.9982028e-006  Max(alpha.water) = 1.0000002
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.0069168406  Min(alpha.water) = -0.0027150452  Max(alpha.water) = 1.0002525
smoothSolver:  Solving for Ux, Initial residual = 0.0024374319, Final residual = 0.00016418998, No Iterations 1
smoothSolver:  Solving for Uy, Initial residual = 0.0029438757, Final residual = 0.00022770844, No Iterations 1
smoothSolver:  Solving for Uz, Initial residual = 0.012344524, Final residual = 0.00096820841, No Iterations 1
GAMG:  Solving for p_rgh, Initial residual = 0.0223709, Final residual = 0.00015670417, No Iterations 2
GAMG:  Solving for p_rgh, Initial residual = 0.00066884765, Final residual = 4.5459619e-006, No Iterations 3
GAMG:  Solving for p_rgh, Initial residual = 0.00010618805, Final residual = 5.5520633e-007, No Iterations 3
time step continuity errors : sum local = 5.093267e-008, global = -1.7406469e-008, cumulative = -4.3114422e-006
GAMG:  Solving for p_rgh, Initial residual = 0.0013193478, Final residual = 4.7956439e-006, No Iterations 3
GAMG:  Solving for p_rgh, Initial residual = 0.00011301249, Final residual = 4.4441165e-007, No Iterations 3
GAMG:  Solving for p_rgh, Initial residual = 2.0171242e-005, Final residual = 9.25677e-008, No Iterations 3
time step continuity errors : sum local = 8.4866827e-009, global = 2.5894171e-009, cumulative = -4.3088528e-006
PIMPLE: iteration 2
smoothSolver:  Solving for alpha.water, Initial residual = 0.0032416862, Final residual = 9.1914122e-010, No Iterations 4
Phase-1 volume fraction = 0.00691684  Min(alpha.water) = -4.8085559e-006  Max(alpha.water) = 1.0000002
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.0069168406  Min(alpha.water) = -0.0024832499  Max(alpha.water) = 1.0002574
smoothSolver:  Solving for Ux, Initial residual = 0.0015384606, Final residual = 9.1613033e-005, No Iterations 1
smoothSolver:  Solving for Uy, Initial residual = 0.001684108, Final residual = 0.00011784075, No Iterations 1
smoothSolver:  Solving for Uz, Initial residual = 0.0054832419, Final residual = 0.00029107622, No Iterations 1
GAMG:  Solving for p_rgh, Initial residual = 0.0023800499, Final residual = 1.9460927e-005, No Iterations 2
GAMG:  Solving for p_rgh, Initial residual = 0.0001535107, Final residual = 9.3338449e-007, No Iterations 3
GAMG:  Solving for p_rgh, Initial residual = 2.6699164e-005, Final residual = 1.3347999e-007, No Iterations 3
time step continuity errors : sum local = 1.2211031e-008, global = 2.0274662e-009, cumulative = -4.3068254e-006
GAMG:  Solving for p_rgh, Initial residual = 0.00012309092, Final residual = 4.6944927e-007, No Iterations 3
GAMG:  Solving for p_rgh, Initial residual = 1.3389387e-005, Final residual = 4.8603763e-008, No Iterations 3
GAMG:  Solving for p_rgh, Initial residual = 2.4859023e-006, Final residual = 3.1315433e-008, No Iterations 2
time step continuity errors : sum local = 2.8654481e-009, global = -4.385919e-010, cumulative = -4.307264e-006
PIMPLE: iteration 3
smoothSolver:  Solving for alpha.water, Initial residual = 0.003252499, Final residual = 9.2321705e-010, No Iterations 4
Phase-1 volume fraction = 0.00691684  Min(alpha.water) = -4.5039744e-006  Max(alpha.water) = 1.0000002
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.0069168406  Min(alpha.water) = -0.002529705  Max(alpha.water) = 1.0002668
smoothSolver:  Solving for Ux, Initial residual = 0.0011599909, Final residual = 9.006172e-009, No Iterations 7
smoothSolver:  Solving for Uy, Initial residual = 0.001369171, Final residual = 5.2600945e-009, No Iterations 8
smoothSolver:  Solving for Uz, Initial residual = 0.0034087053, Final residual = 3.4716123e-009, No Iterations 9
GAMG:  Solving for p_rgh, Initial residual = 0.0081285992, Final residual = 7.3141984e-005, No Iterations 2
GAMG:  Solving for p_rgh, Initial residual = 0.00038799975, Final residual = 2.7431327e-006, No Iterations 3
GAMG:  Solving for p_rgh, Initial residual = 6.767316e-005, Final residual = 3.0605883e-007, No Iterations 3
time step continuity errors : sum local = 4.6038218e-008, global = 4.6559063e-009, cumulative = -4.302608e-006
GAMG:  Solving for p_rgh, Initial residual = 0.0003258291, Final residual = 8.9802616e-007, No Iterations 3
GAMG:  Solving for p_rgh, Initial residual = 3.1587352e-005, Final residual = 1.0951785e-007, No Iterations 3
GAMG:  Solving for p_rgh, Initial residual = 5.9103347e-006, Final residual = 7.2510559e-008, No Iterations 2
time step continuity errors : sum local = 1.0917308e-008, global = 4.5101177e-010, cumulative = -4.302157e-006
ExecutionTime = 4424.827 s  ClockTime = 4425 s

Courant Number mean: 0.05183831 max: 1.122726
Interface Courant Number mean: 0.004955322 max: 0.94199071
deltaT = 0.015620568
Time = 12.875
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