[huxiaoxia]

Hi,

I run some cases with interFoam. But when the running time is up, if I want to continue running the cases, it shows the problem "
Build : 1.7.1-03e7e056c215
Exec : interFoam -parallel -case .
Date : Aug 02 2011
Time : 12:49:54
Host : cs295
PID : 12347
Case : /netmount/ip11_home/huxiaoxi/OpenFOAM/huxiaoxia/spatial70con
nProcs : 4
Slaves :
3
(
cs295.12348
cs295.12349
cs295.12350
)
Pstream initialized with:
floatTransfer : 0
nProcsSimpleSum : 0
commsType : nonBlocking
SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time
Create mesh for time = 0.00428
Reading field p_rgh
Reading field alpha1
Reading field U
Reading/calculating face flux field phi
Reading transportProperties
Selecting incompressible transport model Newtonian
Selecting incompressible transport model Newtonian
Selecting turbulence model type LESModel
Selecting LES turbulence model oneEqEddy
oneEqEddyCoeffs
{
ce 1.048;
ck 0.094;
}
　
Reading g
Calculating field g.h
time step continuity errors : sum local = 2.858218e-11, global = 1.700856e-15, cumulative = 1.700856e-15
GAMGPCG: Solving for pcorr, Initial residual = 1, Final residual = 1.880548e-06, No Iterations 3
GAMGPCG: Solving for pcorr, Initial residual = 9.402672e-07, Final residual = 9.402672e-07, No Iterations 0
time step continuity errors : sum local = 5.37502e-17, global = -6.884058e-20, cumulative = 1.700787e-15
Courant Number mean: 0.0001182975 max: 0.0007596963
Starting time loop
Courant Number mean: 0.0001182975 max: 0.0007596963
Interface Courant Number mean: 4.086113e-07 max: 0.0004351158
deltaT = 1.199976e-09
Time = 0.004280001
--> FOAM Warning :
From function Time:perator++()
in file db/Time/Time.C at line 681
Increased the timePrecision from 7 to 8 to distinguish between timeNames at time 0.00428
MULES: Solving for alpha1
Liquid phase volume fraction = 0.04687154 Min(alpha1) = -1100.25 Max(alpha1) = 1295.916
MULES: Solving for alpha1
Liquid phase volume fraction = 0.04687156 Min(alpha1) = -1099.25 Max(alpha1) = 1294.916
MULES: Solving for alpha1
Liquid phase volume fraction = 0.04687157 Min(alpha1) = -1098.25 Max(alpha1) = 1293.916
MULES: Solving for alpha1
Liquid phase volume fraction = 0.04687158 Min(alpha1) = -1097.249 Max(alpha1) = 1292.916
"

Can anyone help me ?

Thanks.

[wyldckat]

Greetings huxiaoxia,

This is pretty simple - the error message reads:

Originally Posted by huxiaoxia

Increased the timePrecision from 7 to 8 to distinguish between timeNames at time 0.00428

This means that you must edit the system/controlDict file and change that parameter from 7 to 8, or even 9 or 10!
The time resolution is very small, so if you want to save these small time steps, you'll need to increase the number of digits saved in the folder name!

Best regards,
Bruno

[huxiaoxia]

Thanks a lot.

[sabin.ceuca]

Hi huxiaoxia,
you should consider this "warning" only if you think you could have numerical problems due to small time steps. In any other case OF takes care of this, as you can see in the message
Time = 0.004280001
--> FOAM Warning :
From function Timeerator++()
in file db/Time/Time.C at line 681
Increased the timePrecision from 7 to 8 to distinguish between timeNames at time 0.00428
It will still save the times you have chosen in controlDict.

Regards,
sabin