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Time step continuity errors for simpleFoam solver |
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May 12, 2016, 00:59 |
Time step continuity errors for simpleFoam solver
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#1 |
Member
Janry
Join Date: Oct 2015
Posts: 46
Rep Power: 10 |
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 |
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May 12, 2016, 04:02 |
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#2 |
Senior Member
anonymous
Join Date: Aug 2014
Posts: 205
Rep Power: 12 |
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 |
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May 13, 2016, 00:49 |
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#3 |
Member
Janry
Join Date: Oct 2015
Posts: 46
Rep Power: 10 |
Hi there,
Thanks for your direction. I'll try then! Regards, Janry |
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