liguifan 
April 7, 2013 18:18 
Here is some log content I got from running the code
Quote:
time step continuity errors : sum local = 0, global = 0, cumulative = 0
GAMGPCG: Solving for pcorr, Initial residual = 0, Final residual = 0, No Iterations 0
time step continuity errors : sum local = 0, global = 0, cumulative = 0
Courant Number mean: 0 max: 0
Starting time loop
Courant Number mean: 0 max: 0
deltaT = 0.00119048
Time = 0.0011904761904761905836
MULES: Solving for alphawater
water volume fraction, min, max = 1 1 1
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 0 0 0
Phasesum volume fraction, min, max = 1 1 1
MULES: Solving for alphawater
water volume fraction, min, max = 1 1 1
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 0 0 0
Phasesum volume fraction, min, max = 1 1 1
MULES: Solving for alphawater
water volume fraction, min, max = 1 1 1
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 0 0 0
Phasesum volume fraction, min, max = 1 1 1
alphawater phase volume in zone internal = 508.292 ml
alphaoil phase volume in zone internal = 0 ml
alphaair phase volume in zone internal = 0 ml
GAMG: Solving for p, Initial residual = 1, Final residual = 0.0236848, No Iterations 6
time step continuity errors : sum local = 1.64387e05, global = 1.03465e05, cumulative = 1.03465e05
GAMG: Solving for p, Initial residual = 0.00074067, Final residual = 2.70641e05, No Iterations 4
time step continuity errors : sum local = 7.79738e07, global = 5.07037e07, cumulative = 1.08535e05
GAMGPCG: Solving for p, Initial residual = 2.96832e05, Final residual = 8.98889e09, No Iterations 3
time step continuity errors : sum local = 2.61834e10, global = 8.68849e12, cumulative = 1.08536e05
ExecutionTime = 3.78 s
Courant Number mean: 6.82615e06 max: 1.98889e05
deltaT = 0.00139456
Time = 0.0025850340136054422366
MULES: Solving for alphawater
water volume fraction, min, max = 1 0 1
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 0 0 1
Phasesum volume fraction, min, max = 1 1 1
MULES: Solving for alphawater
water volume fraction, min, max = 1 0 1
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 4.35967e09 0 1
Phasesum volume fraction, min, max = 1 1 1
MULES: Solving for alphawater
water volume fraction, min, max = 1 0 1
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 8.71935e09 4.82588e34 1
Phasesum volume fraction, min, max = 1 1 1
alphawater phase volume in zone internal = 508.292 ml
alphaoil phase volume in zone internal = 0 ml
alphaair phase volume in zone internal = 4.43198e06 ml
GAMG: Solving for p, Initial residual = 0.0381303, Final residual = 1.6858e08, No Iterations 1
time step continuity errors : sum local = 5.30546e05, global = 1.88254e05, cumulative = 2.96789e05
GAMG: Solving for p, Initial residual = 1.93613e08, Final residual = 1.93613e08, No Iterations 0
time step continuity errors : sum local = 6.10707e05, global = 2.57188e05, cumulative = 5.53978e05
GAMGPCG: Solving for p, Initial residual = 2.94069e08, Final residual = 2.94069e08, No Iterations 0
time step continuity errors : sum local = 9.27571e05, global = 9.34652e06, cumulative = 4.60513e05
ExecutionTime = 7.15 s
Courant Number mean: 0.000483287 max: 0.00911681
deltaT = 0.001635
Time = 0.0042200328407224962576
MULES: Solving for alphawater
water volume fraction, min, max = 1.00001 0 1.00338
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 1.84692e05 0.00432414 1
Phasesum volume fraction, min, max = 0.999996 0.993861 1.00071
MULES: Solving for alphawater
water volume fraction, min, max = 0.999996 0 1.00406
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 3.56282e06 0.00427731 1
Phasesum volume fraction, min, max = 0.999993 0.98778 1.00141
MULES: Solving for alphawater
water volume fraction, min, max = 0.999978 0 1.00474
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 1.1343e05 0.00423064 1
Phasesum volume fraction, min, max = 0.999989 0.981739 1.0021
alphawater phase volume in zone internal = 508.281 ml
alphaoil phase volume in zone internal = 0 ml
alphaair phase volume in zone internal = 0.00576554 ml
GAMG: Solving for p, Initial residual = 0.0253438, Final residual = 1.98857e08, No Iterations 1
time step continuity errors : sum local = 0.000105995, global = 6.39265e05, cumulative = 0.000109978
GAMG: Solving for p, Initial residual = 0.0473882, Final residual = 0.000306761, No Iterations 1
time step continuity errors : sum local = 1.71959, global = 0.212659, cumulative = 0.212549
GAMGPCG: Solving for p, Initial residual = 1, Final residual = 1.51042e08, No Iterations 6
time step continuity errors : sum local = 66013.1, global = 9015.75, cumulative = 9015.54
ExecutionTime = 10.62 s
Courant Number mean: 2.72432e+13 max: 1.83728e+17
deltaT = 4.4495e21
> FOAM Warning :
From function Time::operator++()
in file db/Time/Time.C at line 1029
Increased the timePrecision from 20 to 21 to distinguish between timeNames at time 0.00422003
Time = 0.00422003284072249625763
> FOAM Warning :
From function Time::operator++()
in file db/Time/Time.C at line 1029
Increased the timePrecision from 21 to 22 to distinguish between timeNames at time 0.00422003
MULES: Solving for alphawater
water volume fraction, min, max = 0.999978 0 1.00474
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 1.1367e05 0.00402082 1
Phasesum volume fraction, min, max = 0.999989 0.982154 1.0021
> FOAM Warning :
From function Time::operator++()
in file db/Time/Time.C at line 1029
Increased the timePrecision from 22 to 24 to distinguish between timeNames at time 0.00422003
MULES: Solving for alphawater
water volume fraction, min, max = 0.999978 0 1.00461
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 1.14044e05 0.0040187 1
Phasesum volume fraction, min, max = 0.999989 0.982243 1.0021
> FOAM Warning :
From function Time::operator++()
in file db/Time/Time.C at line 1029
Increased the timePrecision from 24 to 25 to distinguish between timeNames at time 0.00422003
MULES: Solving for alphawater
water volume fraction, min, max = 0.999978 0 1.00459
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 1.14419e05 0.00401781 1
Phasesum volume fraction, min, max = 0.999989 0.982245 1.0021
> FOAM Warning :
From function Time::operator++()
in file db/Time/Time.C at line 1029
Increased the timePrecision from 25 to 26 to distinguish between timeNames at time 0.00422003
alphawater phase volume in zone internal = 508.281 ml
alphaoil phase volume in zone internal = 0 ml
alphaair phase volume in zone internal = 0.00581581 ml
GAMG: Solving for p, Initial residual = 1, Final residual = 0.0306118, No Iterations 1
time step continuity errors : sum local = 2.68775e06, global = 1.07034e06, cumulative = 9015.54
GAMG: Solving for p, Initial residual = 8.01422e06, Final residual = 4.91744e08, No Iterations 1
time step continuity errors : sum local = 1.4253e06, global = 1.00707e07, cumulative = 9015.54
GAMGPCG: Solving for p, Initial residual = 5.0605e06, Final residual = 1.33807e08, No Iterations 1
time step continuity errors : sum local = 5.50534e07, global = 8.27593e08, cumulative = 9015.54
ExecutionTime = 14.02 s
Courant Number mean: 8.80955e05 max: 0.05748
deltaT = 5.3394e21
Time = 0.0042200328407224962576349547
> FOAM Warning :
From function Time::operator++()
in file db/Time/Time.C at line 1029
Increased the timePrecision from 26 to 27 to distinguish between timeNames at time 0.00422003
MULES: Solving for alphawater
water volume fraction, min, max = 0.999978 0 1.00459
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 1.15751e05 0.00401756 1
Phasesum volume fraction, min, max = 0.999989 0.982247 1.00223
> FOAM Warning :
From function Time::operator++()
in file db/Time/Time.C at line 1029
Increased the timePrecision from 27 to 28 to distinguish between timeNames at time 0.00422003
MULES: Solving for alphawater
water volume fraction, min, max = 0.999978 0 1.00459
MULES: Solving for alphaoil
oil volume fraction, min, max = 0 0 0
MULES: Solving for alphaair
air volume fraction, min, max = 1.17348e05 0.0040173 1
Phasesum volume fraction, min, max = 0.999989 0.982248 1.00254
> FOAM Warning :
From function Time::operator++()
in file db/Time/Time.C at line 1029
Increased the timePrecision from 28 to 29 to distinguish between timeNames at time 0.00422003

The Delta T become extremely small!
