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Unacceptable deltaT value (like 3e-107) Error

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Old   February 10, 2020, 03:45
Post Unacceptable deltaT value (like 3e-107) Error
  #1
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Said
Join Date: Feb 2020
Location: Türkiye
Posts: 13
Rep Power: 2
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Hi, I'm getting an error. I've tried a lot of things but i didn't solve my problem. My solver is interFoam. Just look at the deltaT (like 3e-107) and alpha.water (like 3e-64) values in error file and you can see the Time value is never changing. Why i'm getting this error? How can i fix this?
(I used SolidWorks 2016, salome 8.4.0, openfoam-7, ubuntu 18.04 and i customized classic laminar/damBreak case.)



boundary

Code:
{
    version     2.0;
    format      ascii;
    class       polyBoundaryMesh;
    location    "constant/polyMesh";
    object      boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

5
(
    leftWall
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          116;
        startFace       26049;
    }
    rightWall
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          80;
        startFace       26165;
    }
    lowerWall
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          136;
        startFace       26245;
    }
    atmosphere
    {
        type            patch;
        nFaces          120;
        startFace       26381;
    }
    defaultFaces
    {
        type            empty;
        inGroups        List<word> 1(empty);
        nFaces          9918;
        startFace       26501;
    }
)

// ************************************************************************* //
alpha.water

Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      alpha.water;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 0 0 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    leftWall
    {
        type            zeroGradient;
    }

    rightWall
    {
        type            zeroGradient;
    }

    lowerWall
    {
        type            zeroGradient;
    }

    atmosphere
    {
        type            inletOutlet;
        inletValue      uniform 0;
        value           uniform 0;
    }

    defaultFaces
    {
        type            empty;
    }
}
p_rgh

Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      p_rgh;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [1 -1 -2 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    leftWall
    {
        type            fixedFluxPressure;
        value           uniform 0;
    }

    rightWall
    {
        type            fixedFluxPressure;
        value           uniform 0;
    }

    lowerWall
    {
        type            fixedFluxPressure;
        value           uniform 0;
    }

    atmosphere
    {
        type            totalPressure;
        p0              uniform 0;
    }

    defaultFaces
    {
        type            empty;
    }
}
U

Code:
FoamFile
{
    version     2.0;
    format      ascii;
    class       volVectorField;
    location    "0";
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 1 -1 0 0 0 0];

internalField   uniform (0 0 0);

boundaryField
{
    leftWall
    {
        type            noSlip;
    }
    rightWall
    {
        type            noSlip;
    }
    lowerWall
    {
        type            noSlip;
    }
    atmosphere
    {
        type            pressureInletOutletVelocity;
        value           uniform (0 0 0);
    }
    defaultFaces
    {
        type            empty;
    }
}
HERE MY ERROR
Code:
smoothSolver:  Solving for alpha.water, Initial residual = 5.98474e-05, Final residual = 3.88048e-11, No Iterations 2
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -4.44338e-68  Max(alpha.water) = 1
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -3.52175e-17  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.781862, Final residual = 0.0317406, No Iterations 8
time step continuity errors : sum local = 0.000492867, global = -3.45236e-08, cumulative = 0.00744918
DICPCG:  Solving for p_rgh, Initial residual = 0.608476, Final residual = 0.0248548, No Iterations 8
time step continuity errors : sum local = 0.00162432, global = 1.66769e-08, cumulative = 0.0074492
DICPCG:  Solving for p_rgh, Initial residual = 0.618346, Final residual = 9.228e-08, No Iterations 362
time step continuity errors : sum local = 2.749e-08, global = -8.68054e-10, cumulative = 0.0074492
ExecutionTime = 35.66 s  ClockTime = 36 s

Courant Number mean: 0.0396433 max: 17.064
Interface Courant Number mean: 0.00390682 max: 5.60411
deltaT = 7.77403e-100
Time = 0.00119069

smoothSolver:  Solving for alpha.water, Initial residual = 5.84367e-05, Final residual = 3.60982e-11, No Iterations 2
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -4.44162e-68  Max(alpha.water) = 1
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -5.0219e-17  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.779072, Final residual = 0.0316353, No Iterations 8
time step continuity errors : sum local = 7.53892e-05, global = -4.91121e-09, cumulative = 0.00744919
DICPCG:  Solving for p_rgh, Initial residual = 0.607604, Final residual = 0.0248692, No Iterations 8
time step continuity errors : sum local = 0.000248544, global = 2.35874e-09, cumulative = 0.00744919
DICPCG:  Solving for p_rgh, Initial residual = 0.616997, Final residual = 9.84716e-08, No Iterations 362
time step continuity errors : sum local = 4.46598e-09, global = -1.34046e-10, cumulative = 0.00744919
ExecutionTime = 36.11 s  ClockTime = 37 s

Courant Number mean: 0.00599844 max: 2.59439
Interface Courant Number mean: 0.000588719 max: 0.891569
deltaT = 1.49824e-100
Time = 0.00119069

smoothSolver:  Solving for alpha.water, Initial residual = 5.73287e-05, Final residual = 3.53128e-11, No Iterations 2
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -4.43785e-68  Max(alpha.water) = 1
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -6.81171e-17  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.776517, Final residual = 0.0313868, No Iterations 8
time step continuity errors : sum local = 0.00048802, global = -2.93771e-08, cumulative = 0.00744916
DICPCG:  Solving for p_rgh, Initial residual = 0.606532, Final residual = 0.0247253, No Iterations 8
time step continuity errors : sum local = 0.00160604, global = 1.3903e-08, cumulative = 0.00744918
DICPCG:  Solving for p_rgh, Initial residual = 0.615519, Final residual = 9.41518e-08, No Iterations 340
time step continuity errors : sum local = 2.75985e-08, global = -1.00355e-09, cumulative = 0.00744918
ExecutionTime = 36.54 s  ClockTime = 37 s

Courant Number mean: 0.0385174 max: 16.7802
Interface Courant Number mean: 0.00380786 max: 6.09569
deltaT = 4.4643e-102
Time = 0.00119069

smoothSolver:  Solving for alpha.water, Initial residual = 5.61634e-05, Final residual = 3.3963e-11, No Iterations 2
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -4.42924e-68  Max(alpha.water) = 1
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -4.35845e-17  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.773262, Final residual = 0.0307347, No Iterations 8
time step continuity errors : sum local = 7.27895e-05, global = -3.94879e-09, cumulative = 0.00744917
DICPCG:  Solving for p_rgh, Initial residual = 0.604857, Final residual = 0.024329, No Iterations 8
time step continuity errors : sum local = 0.000239488, global = 2.02513e-09, cumulative = 0.00744917
DICPCG:  Solving for p_rgh, Initial residual = 0.613341, Final residual = 9.64352e-08, No Iterations 362
time step continuity errors : sum local = 4.2589e-09, global = -1.19707e-10, cumulative = 0.00744917
ExecutionTime = 36.98 s  ClockTime = 38 s

Courant Number mean: 0.00578662 max: 2.56257
Interface Courant Number mean: 0.000578441 max: 0.973182
deltaT = 8.71061e-103
Time = 0.00119069

smoothSolver:  Solving for alpha.water, Initial residual = 5.49118e-05, Final residual = 3.2171e-11, No Iterations 2
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -4.4112e-68  Max(alpha.water) = 1
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -3.96341e-16  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.770017, Final residual = 0.0299674, No Iterations 8
time step continuity errors : sum local = 0.000454079, global = -2.18559e-08, cumulative = 0.00744915
DICPCG:  Solving for p_rgh, Initial residual = 0.602994, Final residual = 0.0293486, No Iterations 5
time step continuity errors : sum local = 0.00183973, global = 9.67059e-08, cumulative = 0.00744925
DICPCG:  Solving for p_rgh, Initial residual = 0.620295, Final residual = 9.23708e-08, No Iterations 342
time step continuity errors : sum local = 2.46046e-08, global = -9.39872e-11, cumulative = 0.00744925
ExecutionTime = 37.41 s  ClockTime = 38 s

Courant Number mean: 0.0322515 max: 17.5305
Interface Courant Number mean: 0.00359975 max: 6.76509
deltaT = 2.48441e-104
Time = 0.00119069

smoothSolver:  Solving for alpha.water, Initial residual = 4.83567e-05, Final residual = 1.91459e-11, No Iterations 2
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -1.04402e-46  Max(alpha.water) = 1
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -2.51392e-17  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.742106, Final residual = 0.0363213, No Iterations 7
time step continuity errors : sum local = 6.49571e-05, global = -5.59286e-11, cumulative = 0.00744925
DICPCG:  Solving for p_rgh, Initial residual = 0.606875, Final residual = 0.0274085, No Iterations 5
time step continuity errors : sum local = 0.000207145, global = 4.45286e-09, cumulative = 0.00744925
DICPCG:  Solving for p_rgh, Initial residual = 0.619751, Final residual = 9.17399e-08, No Iterations 362
time step continuity errors : sum local = 3.04518e-09, global = -6.90435e-11, cumulative = 0.00744925
ExecutionTime = 37.86 s  ClockTime = 38 s

Courant Number mean: 0.0040732 max: 2.24028
Interface Courant Number mean: 0.000418459 max: 0.609483
deltaT = 5.54488e-105
Time = 0.00119069

smoothSolver:  Solving for alpha.water, Initial residual = 4.76685e-05, Final residual = 2.01965e-11, No Iterations 2
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -9.91398e-47  Max(alpha.water) = 1
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -3.04471e-17  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.744592, Final residual = 0.0363254, No Iterations 5
time step continuity errors : sum local = 0.000498639, global = 1.99994e-08, cumulative = 0.00744927
DICPCG:  Solving for p_rgh, Initial residual = 0.623883, Final residual = 0.0268522, No Iterations 5
time step continuity errors : sum local = 0.00154667, global = -3.01824e-08, cumulative = 0.00744924
DICPCG:  Solving for p_rgh, Initial residual = 0.613925, Final residual = 9.08759e-08, No Iterations 363
time step continuity errors : sum local = 2.22317e-08, global = -4.95163e-10, cumulative = 0.00744924
ExecutionTime = 38.34 s  ClockTime = 39 s

Courant Number mean: 0.0304221 max: 16.379
Interface Courant Number mean: 0.00306763 max: 4.27059
deltaT = 1.69268e-106
Time = 0.00119069

smoothSolver:  Solving for alpha.water, Initial residual = 4.75175e-05, Final residual = 1.99622e-11, No Iterations 2
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -4.24586e-68  Max(alpha.water) = 1
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -3.42133e-17  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.743859, Final residual = 0.0325512, No Iterations 5
time step continuity errors : sum local = 6.12945e-05, global = 4.61408e-09, cumulative = 0.00744925
DICPCG:  Solving for p_rgh, Initial residual = 0.616162, Final residual = 0.0244443, No Iterations 5
time step continuity errors : sum local = 0.000188544, global = -8.24671e-09, cumulative = 0.00744924
DICPCG:  Solving for p_rgh, Initial residual = 0.605392, Final residual = 9.66245e-08, No Iterations 362
time step continuity errors : sum local = 3.08855e-09, global = -3.55315e-11, cumulative = 0.00744924
ExecutionTime = 38.79 s  ClockTime = 39 s

Courant Number mean: 0.0042222 max: 2.28614
Interface Courant Number mean: 0.000412843 max: 0.511151
deltaT = 3.70205e-107
Time = 0.00119069

smoothSolver:  Solving for alpha.water, Initial residual = 4.32103e-05, Final residual = 1.9414e-11, No Iterations 2
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -4.1624e-68  Max(alpha.water) = 1
MULES: Correcting alpha.water
MULES: Correcting alpha.water
Phase-1 volume fraction = 0.0746171  Min(alpha.water) = -2.01258e-17  Max(alpha.water) = 1
#0  Foam::error::printStack(Foam::Ostream&) at ??:?
#1  Foam::sigFpe::sigHandler(int) at ??:?
#2  ? in "/lib/x86_64-linux-gnu/libc.so.6"
#3  double Foam::sumProd<double>(Foam::UList<double> const&, Foam::UList<double> const&) at ??:?
#4  Foam::PCG::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const at ??:?
#5  Foam::fvMatrix<double>::solveSegregated(Foam::dictionary const&) at ??:?
#6  Foam::fvMatrix<double>::solve(Foam::dictionary const&) in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/interFoam"
#7  Foam::fvMatrix<double>::solve() in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/interFoam"
#8  ? in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/interFoam"
#9  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#10  ? in "/opt/openfoam7/platforms/linux64GccDPInt32Opt/bin/interFoam"
p { margin-bottom: 0.25cm; line-height: 115% }
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Old   March 6, 2020, 01:38
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Andreas P.
Join Date: May 2017
Posts: 29
Rep Power: 5
AndreasPe is on a distinguished road
Probably your time precision is too low, so that the 3e-107 is treated as a 0. I don't think you will be able to have time precision so high to use such small time steps...
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