[arieljeds]

Has anyone ever had issues where a simulation appears to be running fine for a while and then all of a sudden the deltat drops? I've been having this issue a lot lately but I can't see where the problem is! The change is here:

PIMPLE: iteration 1
smoothSolver:  Solving for alpha.water, Initial residual = 0.000159214, Final residual = 1.09429e-09, No Iterations 2
Phase-1 volume fraction = 0.49972  Min(alpha.water) = 0  Max(alpha.water) = 1
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.49972  Min(alpha.water) = 0  Max(alpha.water) = 1
smoothSolver:  Solving for alpha.water, Initial residual = 0.000159195, Final residual = 1.09063e-09, No Iterations 2
Phase-1 volume fraction = 0.499725  Min(alpha.water) = 0  Max(alpha.water) = 1
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.499725  Min(alpha.water) = 0  Max(alpha.water) = 1
Relaxing time: 0.34 s
DILUPBiCG:  Solving for Ux, Initial residual = 0.0193477, Final residual = 3.2728e-10, No Iterations 5
DILUPBiCG:  Solving for Uy, Initial residual = 0.0360669, Final residual = 6.14476e-10, No Iterations 6
DILUPBiCG:  Solving for Uz, Initial residual = 0.0267747, Final residual = 2.151e-10, No Iterations 6
GAMG:  Solving for p_rgh, Initial residual = 0.0861943, Final residual = 6.19214e-08, No Iterations 11
GAMG:  Solving for p_rgh, Initial residual = 6.18121e-08, Final residual = 6.18121e-08, No Iterations 0
time step continuity errors : sum local = 2.19054e-09, global = 1.67054e-10, cumulative = 3.03711e-07
GAMG:  Solving for p_rgh, Initial residual = 0.00409517, Final residual = 5.53998e-08, No Iterations 8
GAMG:  Solving for p_rgh, Initial residual = 5.57103e-08, Final residual = 5.57103e-08, No Iterations 0
time step continuity errors : sum local = 1.96274e-09, global = -6.46754e-11, cumulative = 3.03647e-07
GAMG:  Solving for p_rgh, Initial residual = 0.000179261, Final residual = 7.23713e-08, No Iterations 4
GAMG:  Solving for p_rgh, Initial residual = 7.2353e-08, Final residual = 4.88468e-09, No Iterations 3
time step continuity errors : sum local = 1.72138e-10, global = -1.95651e-11, cumulative = 3.03627e-07
ExecutionTime = 19313.5 s  ClockTime = 19418 s

Courant Number mean: 0.0200536 max: 0.287687
Interface Courant Number mean: 0.00174722 max: 0.278472
deltaT = 0.0333333
Time = 141.4

PIMPLE: iteration 1
smoothSolver:  Solving for alpha.water, Initial residual = 0.000160211, Final residual = 1.21376e-09, No Iterations 2
Phase-1 volume fraction = 0.499738  Min(alpha.water) = 0  Max(alpha.water) = 1
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.499738  Min(alpha.water) = 0  Max(alpha.water) = 1
smoothSolver:  Solving for alpha.water, Initial residual = 0.000160196, Final residual = 1.20508e-09, No Iterations 2
Phase-1 volume fraction = 0.499744  Min(alpha.water) = 0  Max(alpha.water) = 1
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.499744  Min(alpha.water) = 0  Max(alpha.water) = 1
Relaxing time: 0.33 s
DILUPBiCG:  Solving for Ux, Initial residual = 0.0191853, Final residual = 5.28108e-10, No Iterations 5
DILUPBiCG:  Solving for Uy, Initial residual = 0.0356779, Final residual = 2.93859e+09, No Iterations 1001
DILUPBiCG:  Solving for Uz, Initial residual = 0.0264449, Final residual = 2.89763e-10, No Iterations 6
GAMG:  Solving for p_rgh, Initial residual = 0.999999, Final residual = 5.65492e-08, No Iterations 16
GAMG:  Solving for p_rgh, Initial residual = 2.81667e-08, Final residual = 2.81667e-08, No Iterations 0
time step continuity errors : sum local = 0.00122471, global = 4.41221e-05, cumulative = 4.44258e-05
GAMG:  Solving for p_rgh, Initial residual = 0.957148, Final residual = 8.46286e-08, No Iterations 16
GAMG:  Solving for p_rgh, Initial residual = 3.75967e-08, Final residual = 3.75967e-08, No Iterations 0
time step continuity errors : sum local = 0.00685254, global = 0.0015842, cumulative = 0.00162862
GAMG:  Solving for p_rgh, Initial residual = 0.999988, Final residual = 5.96578e-08, No Iterations 17
GAMG:  Solving for p_rgh, Initial residual = 2.02613e-08, Final residual = 9.59871e-09, No Iterations 1
time step continuity errors : sum local = 26.1795, global = -8.19207, cumulative = -8.19044
ExecutionTime = 19339.3 s  ClockTime = 19444 s

I'm using stokesFirst waves.