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WaterHammer1985 June 29, 2018 17:59
Adapt Fluent Mesh to weirOverflow tutorial
 
I am trying to adapt the weirOverflow tutorial case (interFoam) to a similar domain with a mesh converted from fluent. Schematic of domain is below. Case files are located here https://ufile.io/w2xaw (couldn't upload below).



When I setFields, the alpha.water looks good but the pressure field in the domain does not look good. The water depth is 0.54m (5300Pa) but the pressure upstream of the weir is 5.3e+09Pa (see image). As time progresses in the simulation, the area of high pressure shows odd results (see image).



I've run checkMesh and it looks ok to me. I'm using the same boundary conditions as the weirOverflow tutorial (note that inlet_air is being modeled as a wall).



If anyone has advice on how I should be troubleshooting this it would be greatly appreciated. Thanks!



https://i.imgur.com/jnaHEUQ.png

https://i.imgur.com/CWf4lTD.png

https://i.imgur.com/qYxk9Jl.png


https://i.imgur.com/M9GSUU3.png






0/U

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

#include        "include/initialConditions"

dimensions      [0 1 -1 0 0 0 0];

internalField  uniform (0 0 0);

boundaryField
{
    inlet_flow
    {
        type            variableHeightFlowRateInletVelocity;
        flowRate        $inletFlowRate;
        alpha          alpha.water;
        value          uniform (0 0 0);
    }

    outlet
    {
        type            zeroGradient;
    }

    (sides|bottom|inlet_air|vent)
    {
        type            noSlip;
    }

    top
    {
        type            pressureInletOutletVelocity;
        value          uniform (0 0 0);
    }

    defaultFaces
    {
        type            empty;
    }
}


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

#include        "include/initialConditions"

dimensions      [1 -1 -2 0 0 0 0];

internalField  uniform $pressure;

boundaryField
{
    inlet_flow
    {
        type            zeroGradient;
    }

    outlet
    {
        type            zeroGradient;
    }

    (sides|inlet_air|bottom|vent)
    {
        type            fixedFluxPressure;
    }
    top
    {
        type            totalPressure;
        p0              uniform 0;
    }

    defaultFaces
    {
        type            empty;
    }
}

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

#include        "include/initialConditions"

dimensions      [0 2 -2 0 0 0 0];

internalField  uniform $turbulentKE;

boundaryField
{
    inlet_flow
    {
        type            fixedValue;
        value          $internalField;
    }

    outlet
    {
        type            inletOutlet;
        inletValue      $internalField;
        value          $internalField;
    }

    (sides|inlet_air|bottom|vent)
    {
        type            kqRWallFunction;
        value          $internalField;
    }

    top
    {
        type            inletOutlet;
        inletValue      $internalField;
        value          $internalField;
    }

    defaultFaces
    {
        type            empty;
    }
}


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

#include        "include/initialConditions"

dimensions      [0 2 -3 0 0 0 0];

internalField  uniform $turbulentEpsilon;

boundaryField
{
    inlet_flow
    {
        type            fixedValue;
        value          $internalField;
    }

    outlet
    {
        type            inletOutlet;
        inletValue      $internalField;
        value          $internalField;
    }

    (sides|inlet_air|bottom|vent)
    {
        type            epsilonWallFunction;
        value          $internalField;
    }
 
    top
    {
        type            inletOutlet;
        inletValue      $internalField;
        value          $internalField;
    }

    defaultFaces
    {
        type            empty;
    }
}

0/include/initialconditions
Code:
inletFlowRate        0.007506;
pressure            0;
turbulentKE          4.14e-03;
turbulentEpsilon    4.39e-05;



constant/setFieldsDict
Code:
FoamFile
{
    version    2.0;
    format      ascii;
    class      dictionary;
    object      setFieldsDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

defaultFieldValues
(
    volScalarFieldValue alpha.water 0
);

regions
(
    boxToCell
    {
        box (-100 -50 -100) (100 1.75 0.54);

        fieldValues
        (
            volScalarFieldValue alpha.water 1
            volVectorFieldValue U (0 0.139 0)
        );
    }
);

WaterHammer1985 July 2, 2018 11:31
Additional Information
 
Solver output is below when divergence starts. The time step decreases substantially and the residuals increase substantially. I think the issue is either initial conditions or solver settings since the pressure distribution isn't right from the start.


Solver Settings:
fvSolution

Code:
solvers
{
    alpha.water
    {
        nAlphaCorr      1;
        nAlphaSubCycles 2;
        cAlpha          1;
    }

    "pcorr.*"
    {
        solver          PCG;
        preconditioner  DIC;
        tolerance      1e-10;
        relTol          0;
    }

    p_rgh
    {
        solver          PCG;
        preconditioner  DIC;
        tolerance      1e-07;
        relTol          0.05;
    }

    p_rghFinal
    {
        $p_rgh;
        relTol          0;
    }

    "(U|k|epsilon)"
    {
        solver          smoothSolver;
        smoother        symGaussSeidel;
        tolerance      1e-8;
        relTol          0.1;
    }

    "(U|k|epsilon)Final"
    {
        $U;
        relTol          0;
    }
}

PIMPLE
{
    momentumPredictor no;
    nCorrectors    2;
    nNonOrthogonalCorrectors 2;
}

relaxationFactors
{
    equations
    {
        ".*"                0.001;
    }
}




fvScheme
Code:
ddtSchemes
{
    default        Euler;
}

gradSchemes
{
    default        Gauss linear;
}

divSchemes
{
    div(rhoPhi,U)  Gauss linear;
    div(phi,alpha)  Gauss vanLeer;
    div(phirb,alpha) Gauss linear;
    div(phi,k)      Gauss upwind;
    div(phi,epsilon) Gauss upwind;
    div(phi,R)      Gauss upwind;
    div(R)          Gauss linear;
    div(phi,nuTilda) Gauss upwind;
    div(((rho*nuEff)*dev2(T(grad(U))))) Gauss linear;
}

laplacianSchemes
{
    default        Gauss linear corrected;
}

interpolationSchemes
{
    default        linear;
}

snGradSchemes
{
    default        corrected;
}




controlDict
Code:
application    interFoam;

startFrom      latestTime;

startTime      0;

stopAt          endTime;

endTime        0.001;

deltaT          0.00000001;

writeControl    adjustableRunTime;

writeInterval  0.00001;

purgeWrite      0;

writeFormat    ascii;

writePrecision  6;

writeCompression uncompressed;

timeFormat      general;

timePrecision  6;

runTimeModifiable yes;

adjustTimeStep  on;

maxCo          0.1;
maxAlphaCo      0.1;

maxDeltaT      1;




InterFoam Output Log

Code:
Courant Number mean: 0.00021083 max: 0.00416838
Interface Courant Number mean: 3.08635e-007 max: 0.00201627
deltaT = 1e-005
Time = 0.00031

PIMPLE: iteration 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -1.07061e-020  Max(alpha.water) = 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -1.83867e-020  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.912655, Final residual = 0.0452035, No Iterations 26
DICPCG:  Solving for p_rgh, Initial residual = 0.353369, Final residual = 0.0155799, No Iterations 5
DICPCG:  Solving for p_rgh, Initial residual = 0.0595108, Final residual = 0.0029095, No Iterations 183
time step continuity errors : sum local = 4.49741e-008, global = -2.96729e-009, cumulative = -2.96336e-009
DICPCG:  Solving for p_rgh, Initial residual = 0.0752576, Final residual = 0.00334783, No Iterations 3
DICPCG:  Solving for p_rgh, Initial residual = 0.00942152, Final residual = 0.00046862, No Iterations 197
DICPCG:  Solving for p_rgh, Initial residual = 0.0114744, Final residual = 9.86381e-008, No Iterations 493
time step continuity errors : sum local = 2.09962e-012, global = 3.54764e-015, cumulative = -2.96336e-009
smoothSolver:  Solving for epsilon, Initial residual = 3.87474e-006, Final residual = 6.30295e-015, No Iterations 1
bounding epsilon, min: -7.2867e-006 max: 1.57825 average: 0.00241215
smoothSolver:  Solving for k, Initial residual = 0.396331, Final residual = 5.40972e-009, No Iterations 1
ExecutionTime = 3000.07 s  ClockTime = 3000 s

Courant Number mean: 0.000227262 max: 7.6682
Interface Courant Number mean: 3.222e-007 max: 0.00201458
deltaT = 1.2987e-007
Time = 0.00031013

PIMPLE: iteration 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -8.70959e-021  Max(alpha.water) = 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -8.70955e-021  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.935516, Final residual = 0.0327178, No Iterations 3
DICPCG:  Solving for p_rgh, Initial residual = 0.140695, Final residual = 0.00689146, No Iterations 27
DICPCG:  Solving for p_rgh, Initial residual = 0.0793937, Final residual = 0.0038461, No Iterations 4
time step continuity errors : sum local = 3.49012e-010, global = 1.10442e-010, cumulative = -2.85292e-009
DICPCG:  Solving for p_rgh, Initial residual = 0.0123816, Final residual = 0.000609611, No Iterations 268
DICPCG:  Solving for p_rgh, Initial residual = 0.035881, Final residual = 0.00176372, No Iterations 2
DICPCG:  Solving for p_rgh, Initial residual = 0.00409689, Final residual = 9.91339e-008, No Iterations 505
time step continuity errors : sum local = 1.12217e-014, global = 1.33686e-017, cumulative = -2.85292e-009
smoothSolver:  Solving for epsilon, Initial residual = 0.0563391, Final residual = 9.13358e-009, No Iterations 1
bounding epsilon, min: -1.08559e-006 max: 136.189 average: 0.00254469
smoothSolver:  Solving for k, Initial residual = 0.900509, Final residual = 4.93624e-014, No Iterations 2
ExecutionTime = 3144.87 s  ClockTime = 3145 s

Courant Number mean: 2.92498e-006 max: 0.105088
Interface Courant Number mean: 4.18398e-009 max: 2.61563e-005
deltaT = 1.23377e-007
Time = 0.000310253

PIMPLE: iteration 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -8.70951e-021  Max(alpha.water) = 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -8.70948e-021  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.300217, Final residual = 0.0128521, No Iterations 3
DICPCG:  Solving for p_rgh, Initial residual = 0.190351, Final residual = 0.00898391, No Iterations 6
DICPCG:  Solving for p_rgh, Initial residual = 0.057776, Final residual = 0.00274048, No Iterations 16
time step continuity errors : sum local = 2.27229e-010, global = 7.65957e-011, cumulative = -2.77632e-009
DICPCG:  Solving for p_rgh, Initial residual = 0.024309, Final residual = 0.00120291, No Iterations 75
DICPCG:  Solving for p_rgh, Initial residual = 0.018486, Final residual = 0.000886656, No Iterations 4
DICPCG:  Solving for p_rgh, Initial residual = 0.00270342, Final residual = 9.58717e-008, No Iterations 526
time step continuity errors : sum local = 8.67495e-015, global = -1.95992e-016, cumulative = -2.77632e-009
smoothSolver:  Solving for epsilon, Initial residual = 0.385237, Final residual = 1.16356e-014, No Iterations 2
smoothSolver:  Solving for k, Initial residual = 0.378831, Final residual = 2.88617e-014, No Iterations 2
ExecutionTime = 3261.03 s  ClockTime = 3261 s

Courant Number mean: 2.75481e-006 max: 0.100192
Interface Courant Number mean: 3.97435e-009 max: 2.48412e-005
deltaT = 1.21834e-007
Time = 0.000310375

PIMPLE: iteration 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -8.70945e-021  Max(alpha.water) = 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -8.70941e-021  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.115506, Final residual = 0.00561039, No Iterations 6
DICPCG:  Solving for p_rgh, Initial residual = 0.0819975, Final residual = 0.00391359, No Iterations 30
DICPCG:  Solving for p_rgh, Initial residual = 0.0538272, Final residual = 0.00260565, No Iterations 7
time step continuity errors : sum local = 1.84989e-010, global = -3.89254e-011, cumulative = -2.81525e-009
DICPCG:  Solving for p_rgh, Initial residual = 0.0117506, Final residual = 0.00057926, No Iterations 210
DICPCG:  Solving for p_rgh, Initial residual = 0.0291063, Final residual = 0.00117832, No Iterations 3
DICPCG:  Solving for p_rgh, Initial residual = 0.00371961, Final residual = 9.81533e-008, No Iterations 505
time step continuity errors : sum local = 5.95852e-015, global = 2.10705e-016, cumulative = -2.81525e-009
smoothSolver:  Solving for epsilon, Initial residual = 0.115597, Final residual = 2.95363e-015, No Iterations 2
bounding epsilon, min: -0.00168096 max: 6426.46 average: 0.00862314
smoothSolver:  Solving for k, Initial residual = 0.214181, Final residual = 1.60731e-014, No Iterations 2
ExecutionTime = 3400.22 s  ClockTime = 3401 s

Courant Number mean: 2.71331e-006 max: 0.0987692
Interface Courant Number mean: 3.9244e-009 max: 2.45231e-005
deltaT = 1.21834e-007
Time = 0.000310497

PIMPLE: iteration 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -8.70938e-021  Max(alpha.water) = 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -8.70934e-021  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.999894, Final residual = 0.0489617, No Iterations 90
DICPCG:  Solving for p_rgh, Initial residual = 0.404381, Final residual = 0.0171599, No Iterations 3
DICPCG:  Solving for p_rgh, Initial residual = 0.0451485, Final residual = 0.0022563, No Iterations 152
time step continuity errors : sum local = 6.75034e-006, global = -6.6245e-007, cumulative = -6.65265e-007
DICPCG:  Solving for p_rgh, Initial residual = 0.0967786, Final residual = 0.00446019, No Iterations 19
DICPCG:  Solving for p_rgh, Initial residual = 0.0474411, Final residual = 0.00218411, No Iterations 15
DICPCG:  Solving for p_rgh, Initial residual = 0.0130727, Final residual = 9.6677e-008, No Iterations 592
time step continuity errors : sum local = 2.94031e-010, global = -3.12122e-012, cumulative = -6.65268e-007
smoothSolver:  Solving for epsilon, Initial residual = 0.996401, Final residual = 1.29923e-014, No Iterations 2
smoothSolver:  Solving for k, Initial residual = 0.998144, Final residual = 4.23433e-014, No Iterations 2
ExecutionTime = 19010.9 s  ClockTime = 19011 s

Courant Number mean: 0.00284279 max: 761.518
Interface Courant Number mean: 1.24369e-007 max: 0.00649104
deltaT = 1.59989e-011
Time = 0.000310497

PIMPLE: iteration 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -8.70934e-021  Max(alpha.water) = 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -8.70934e-021  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.999428, Final residual = 0.0421048, No Iterations 6
DICPCG:  Solving for p_rgh, Initial residual = 0.830771, Final residual = 0.0408926, No Iterations 8
DICPCG:  Solving for p_rgh, Initial residual = 0.163154, Final residual = 0.00809898, No Iterations 37
time step continuity errors : sum local = 4.38999e-008, global = 1.08769e-008, cumulative = -6.54391e-007
DICPCG:  Solving for p_rgh, Initial residual = 0.0919018, Final residual = 0.00402157, No Iterations 5
DICPCG:  Solving for p_rgh, Initial residual = 0.0136448, Final residual = 0.000668786, No Iterations 263
DICPCG:  Solving for p_rgh, Initial residual = 0.0401227, Final residual = 9.66418e-008, No Iterations 523
time step continuity errors : sum local = 8.40685e-013, global = 3.97586e-015, cumulative = -6.54391e-007
smoothSolver:  Solving for epsilon, Initial residual = 0.074063, Final residual = 5.02552e-009, No Iterations 1
smoothSolver:  Solving for k, Initial residual = 0.989024, Final residual = 1.15788e-013, No Iterations 2
ExecutionTime = 19159.8 s  ClockTime = 19160 s

Courant Number mean: 4.35561e-006 max: 0.422067
Interface Courant Number mean: 1.9948e-010 max: 1.03862e-005
deltaT = 3.7906e-012
Time = 0.000310497

PIMPLE: iteration 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -3.32457e-021  Max(alpha.water) = 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -3.32457e-021  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.396152, Final residual = 0.0152641, No Iterations 5
DICPCG:  Solving for p_rgh, Initial residual = 0.0159937, Final residual = 0.000446519, No Iterations 3
DICPCG:  Solving for p_rgh, Initial residual = 0.0302559, Final residual = 0.00105529, No Iterations 4
time step continuity errors : sum local = 1.34651e-008, global = 3.03593e-010, cumulative = -6.54088e-007
DICPCG:  Solving for p_rgh, Initial residual = 0.0570515, Final residual = 0.00212148, No Iterations 4
DICPCG:  Solving for p_rgh, Initial residual = 0.0240281, Final residual = 0.00110088, No Iterations 4
DICPCG:  Solving for p_rgh, Initial residual = 0.00662114, Final residual = 9.82176e-008, No Iterations 523
time step continuity errors : sum local = 9.852e-013, global = -2.77961e-014, cumulative = -6.54088e-007
smoothSolver:  Solving for epsilon, Initial residual = 0.202899, Final residual = 5.20576e-014, No Iterations 2
bounding epsilon, min: -1.65665e+009 max: 2.172e+013 average: 2.51751e+007
smoothSolver:  Solving for k, Initial residual = 0.642507, Final residual = 1.90813e-013, No Iterations 2
ExecutionTime = 19270 s  ClockTime = 19270 s

Courant Number mean: 1.82636e-006 max: 0.105859
Interface Courant Number mean: 5.86873e-011 max: 3.21607e-006
deltaT = 3.58079e-012
Time = 0.000310497

PIMPLE: iteration 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -3.32457e-021  Max(alpha.water) = 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -3.32457e-021  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.0435812, Final residual = 0.00160835, No Iterations 4
DICPCG:  Solving for p_rgh, Initial residual = 0.0282882, Final residual = 0.00123018, No Iterations 6
DICPCG:  Solving for p_rgh, Initial residual = 0.00788397, Final residual = 0.000333423, No Iterations 6
time step continuity errors : sum local = 1.60892e-008, global = 3.17143e-009, cumulative = -6.50916e-007
DICPCG:  Solving for p_rgh, Initial residual = 0.00368608, Final residual = 0.000172914, No Iterations 10
DICPCG:  Solving for p_rgh, Initial residual = 0.00192558, Final residual = 8.69467e-005, No Iterations 13
DICPCG:  Solving for p_rgh, Initial residual = 0.000746668, Final residual = 9.91777e-008, No Iterations 479
time step continuity errors : sum local = 4.98774e-012, global = -1.19261e-014, cumulative = -6.50916e-007
smoothSolver:  Solving for epsilon, Initial residual = 0.000867871, Final residual = 1.01795e-010, No Iterations 1
bounding epsilon, min: -2.3916e+012 max: 2.25748e+016 average: 1.68927e+010
smoothSolver:  Solving for k, Initial residual = 0.338717, Final residual = 7.33539e-014, No Iterations 2
ExecutionTime = 19369.2 s  ClockTime = 19369 s

Courant Number mean: 2.2556e-006 max: 0.103696
Interface Courant Number mean: 6.49336e-011 max: 3.42918e-006
deltaT = 3.45315e-012
Time = 0.000310497

PIMPLE: iteration 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -3.32457e-021  Max(alpha.water) = 1
MULES: Solving for alpha.water
Phase-1 volume fraction = 0.375555  Min(alpha.water) = -3.32457e-021  Max(alpha.water) = 1
DICPCG:  Solving for p_rgh, Initial residual = 0.010936, Final residual = 0.000446392, No Iterations 7
DICPCG:  Solving for p_rgh, Initial residual = 0.0329086, Final residual = 0.00138189, No Iterations 6
DICPCG:  Solving for p_rgh, Initial residual = 0.0353479, Final residual = 0.00133968, No Iterations 4
time step continuity errors : sum local = 8.08088e-009, global = -1.50972e-009, cumulative = -6.52426e-007
DICPCG:  Solving for p_rgh, Initial residual = 0.0108574, Final residual = 0.000508876, No Iterations 7
DICPCG:  Solving for p_rgh, Initial residual = 0.00379325, Final residual = 0.000183595, No Iterations 19
DICPCG:  Solving for p_rgh, Initial residual = 0.00245808, Final residual = 9.61317e-008, No Iterations 496
time step continuity errors : sum local = 7.69392e-013, global = 1.34872e-014, cumulative = -6.52426e-007
smoothSolver:  Solving for epsilon, Initial residual = 0.00149323, Final residual = 3.04695e-010, No Iterations 1
bounding epsilon, min: -4.685e+012 max: 1.18131e+017 average: 1.27301e+011
smoothSolver:  Solving for k, Initial residual = 0.274693, Final residual = 5.908e-014, No Iterations 2
bounding k, min: -1934.62 max: 8.57221e+012 average: 3.76148e+007
ExecutionTime = 19471.3 s  ClockTime = 19472 s

Courant Number mean: 2.32787e-006 max: 0.101402
Interface Courant Number mean: 7.22356e-011 max: 3.83681e-006
deltaT = 3.40542e-012
Time = 0.000310497

gkarlsen July 5, 2018 02:37
Sounds like you might be confusing pressure with p_rgh. Could that be the case?

This thread is nice for illustrating the difference between the two:

https://www.cfd-online.com/Forums/op...rgh-1-7-a.html


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