[qjh888]

Hi Foamers,

I've try to run a simpleFoam solver, but faced with the time step continuity errors.
Could somebody point me out from the errors?
Thanks a lot in advance!
Janry


The following is the report.





/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | foam-extend: Open Source CFD |
| \\ / O peration | Version: 3.0 |
| \\ / A nd | Web: http://www.extend-project.de |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 3.0-7a7445ead09d
Exec : simpleFoam
Date : May 12 2016
Time : 14:42:40
Host : Janry
PID : 22505
CtrlDict : /home/uqjqi/foam/foam-extend-3.0/etc/controlDict
Case : /home/uqjqi/Desktop/Turbine_Meshing/22_Apr_2016_tutorial_mesh/Same_02
nProcs : 1
SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0

Initializing the GGI interpolator between master/shadow patches: OF_outlet_00/OF_inlet_10
Reading field p

Reading field U

Reading/calculating face flux field phi

Selecting incompressible transport model Newtonian
Selecting RAS turbulence model kEpsilon
kEpsilonCoeffs
{
Cmu 0.09;
C1 1.44;
C2 1.92;
sigmaEps 1.3;
}


Starting time loop

Time = 5e-05

smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 9.71408e-06, No Iterations 284
smoothSolver: Solving for Uy, Initial residual = 1, Final residual = 9.98843e-06, No Iterations 289
smoothSolver: Solving for Uz, Initial residual = 1, Final residual = 9.78695e-06, No Iterations 116
DICPCG: Solving for p, Initial residual = 1, Final residual = 8.33036e-07, No Iterations 101
time step continuity errors : sum local = 4.00889e-07, global = -8.11738e-10, cumulative = -8.11738e-10
DILUPBiCG: Solving for epsilon, Initial residual = 0.871622, Final residual = 0.0420974, No Iterations 4
DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 0.0726281, No Iterations 4
ExecutionTime = 1.23 s ClockTime = 1 s

Time = 0.0001

smoothSolver: Solving for Ux, Initial residual = 0.894846, Final residual = 9.91355e-06, No Iterations 609
smoothSolver: Solving for Uy, Initial residual = 0.900969, Final residual = 9.96198e-06, No Iterations 595
smoothSolver: Solving for Uz, Initial residual = 0.887805, Final residual = 9.88852e-06, No Iterations 222
DICPCG: Solving for p, Initial residual = 0.874481, Final residual = 6.56763e-07, No Iterations 102
time step continuity errors : sum local = 1.96257e-05, global = -4.77759e-09, cumulative = -5.58933e-09
DILUPBiCG: Solving for epsilon, Initial residual = 0.999874, Final residual = 0.0990665, No Iterations 5
DILUPBiCG: Solving for k, Initial residual = 0.998929, Final residual = 0.0527865, No Iterations 3
ExecutionTime = 3.13 s ClockTime = 3 s

Time = 0.00015

smoothSolver: Solving for Ux, Initial residual = 0.964228, Final residual = 0.508073, No Iterations 1000
smoothSolver: Solving for Uy, Initial residual = 0.978057, Final residual = 0.675267, No Iterations 1000
smoothSolver: Solving for Uz, Initial residual = 0.976478, Final residual = 0.00622259, No Iterations 1000
DICPCG: Solving for p, Initial residual = 0.999775, Final residual = 9.77718e-07, No Iterations 104
time step continuity errors : sum local = 0.117433, global = -0.00012197, cumulative = -0.000121975
DILUPBiCG: Solving for epsilon, Initial residual = 0.999803, Final residual = 0.0415625, No Iterations 10
DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 0.000280347, No Iterations 1
ExecutionTime = 6.95 s ClockTime = 7 s

Time = 0.0002

smoothSolver: Solving for Ux, Initial residual = 0.999879, Final residual = 0.358767, No Iterations 1000
smoothSolver: Solving for Uy, Initial residual = 0.999719, Final residual = 0.165344, No Iterations 1000
smoothSolver: Solving for Uz, Initial residual = 0.999971, Final residual = 0.628794, No Iterations 1000
DICPCG: Solving for p, Initial residual = 1, Final residual = 7.02505e-07, No Iterations 121
time step continuity errors : sum local = 7.42404e+07, global = 146473, cumulative = 146473
DILUPBiCG: Solving for epsilon, Initial residual = 1, Final residual = 0.0313876, No Iterations 12
DILUPBiCG: Solving for k, Initial residual = 1, Final residual = 3.94376e-08, No Iterations 1
bounding k, min: -3.4346e-08 max: 8.74008e+29 average: 1.83008e+27
ExecutionTime = 10.8 s ClockTime = 11 s

Time = 0.00025

smoothSolver: Solving for Ux, Initial residual = 0.940814, Final residual = 0.927791, No Iterations 1000
smoothSolver: Solving for Uy, Initial residual = 0.982984, Final residual = 0.815511, No Iterations 1000
smoothSolver: Solving for Uz, Initial residual = 0.998075, Final residual = 0.983768, No Iterations 1000
DICPCG: Solving for p, Initial residual = 1, Final residual = 9.82424e-07, No Iterations 200
time step continuity errors : sum local = 1.63423e+22, global = 8.38499e+19, cumulative = 8.38499e+19
DILUPBiCG: Solving for epsilon, Initial residual = 0.999834, Final residual = 0.091381, No Iterations 2
bounding epsilon, min: -1.05219e+29 max: 5.27626e+60 average: 3.5716e+57
DILUPBiCG: Solving for k, Initial residual = 0.999999, Final residual = 9.76076e-10, No Iterations 1
bounding k, min: -0.0267417 max: 1.7007e+59 average: 2.41654e+55
ExecutionTime = 14.83 s ClockTime = 15 s

Time = 0.0003

smoothSolver: Solving for Ux, Initial residual = 1, Final residual = 0.889644, No Iterations 1000
smoothSolver: Solving for Uy, Initial residual = 1, Final residual = 0.88891, No Iterations 1000
smoothSolver: Solving for Uz, Initial residual = 1, Final residual = 0.99984, No Iterations 1000
DICPCG: Solving for p, Initial residual = 1, Final residual = 9.92996e-07, No Iterations 628
time step continuity errors : sum local = 3.03276e+58, global = -3.72906e+56, cumulative = -3.72906e+56
DILUPBiCG: Solving for epsilon, Initial residual = 1, Final residual = 0.0647616, No Iterations 5
bounding epsilon, min: -1.74371e+54 max: 3.21198e+118 average: 8.36997e+114
DILUPBiCG: Solving for k, Initial residual = 0.999978, Final residual = 0.0743434, No Iterations 1
bounding k, min: -192031 max: 4.31017e+123 average: 2.83219e+120
ExecutionTime = 19.18 s ClockTime = 19 s

[ssss]

Your case is diverging, you should check schemes, mesh quality, etc.

By the way simplefoam solves the steady NS equations, so the timestep that you are seeing in the log does not have a physical meaning

[qjh888]

Hi there,

Thanks for your direction.
I'll try then!

Regards,
Janry