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Using sprayFOAM on cyclic problem with wedge boundaries

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Old   May 28, 2013, 09:08
Default Using sprayFOAM on cyclic problem with wedge boundaries
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Hello,

I’m working on a Spray Jet Flame Project, trying to validate experimental data. My first idea was to solve this Problem with cyclic boundary conditions on a wedge shaped Mesh (original case has a cylindrical shape).

In building my case step by step I adopted the aachenBomb tutorial, which does the job so far. But here is my Problem:

The injector is located right on the line of symmetry of the wedge, solving works just fine without any errors but the injected mass of the fuel just doesn't reach the defined amount.

My questions are:
Does the sprayFOAM solver even work correctly with wedge boundaries?
If yes, how can I fix this Problem?

Thanks in advance!

Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.2.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      binary;
    class       dictionary;
    location    "constant";
    object      SprayCloudProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

solution
{
    active          true;
    coupled         true;
    transient       yes;
    cellValueSourceCorrection on;

    sourceTerms
    {
        schemes
        {
            rho             explicit 1;
            U               explicit 1;
            Yi              explicit 1;
            h               explicit 1;
            radiation       explicit 1;
        }
    }

    interpolationSchemes
    {
        rho             cell;
        U               cellPoint;
        thermo:mu       cell;
        T               cell;
        Cp              cell;
        p               cell;
    }

    integrationSchemes
    {
        U               Euler;
        T               analytical;
    }
}


constantProperties
{
    T0              320;

    // place holders for rho0 and Cp0 - reset from liquid props using T0
    rho0            1000;
    Cp0             4187;

    youngsModulus   1e9;
    poissonsRatio   0.35;

    epsilon0        1;
    f0              0.5;
    Pr              0.7;
    Tvap            273;
    Tbp             373;

    constantVolume  false;
}


subModels
{
    particleForces
    {
        sphereDrag;
    }

    injectionModels
    {
        model1
        {
            type            coneNozzleInjection;
            SOI             0;
            massTotal       6.0e-6;
            parcelBasisType mass;
            injectionMethod disc;
            flowType        flowRateAndDischarge;
            outerDiameter   1.9e-4;
            innerDiameter   0;
            duration        1.25e-3;
            position        ( 0.07495 0 0 );
            direction       ( -1 0 0 );
            parcelsPerSecond 20000000;
            flowRateProfile table
            (
                (0 0.1272)
                (4.16667e-05 6.1634)
                (8.33333e-05 9.4778)
                (0.000125 9.5806)
                (0.000166667 9.4184)
                (0.000208333 9.0926)
                (0.00025 8.7011)
                (0.000291667 8.2239)
                (0.000333333 8.0401)
                (0.000375 8.845)
                (0.000416667 8.9174)
                (0.000458333 8.8688)
                (0.0005 8.8882)
                (0.000541667 8.6923)
                (0.000583333 8.0014)
                (0.000625 7.2582)
                (0.000666667 7.2757)
                (0.000708333 6.968)
                (0.00075 6.7608)
                (0.000791667 6.6502)
                (0.000833333 6.7695)
                (0.000875 5.5774)
                (0.000916667 4.8649)
                (0.000958333 5.0805)
                (0.001 4.9547)
                (0.00104167 4.5613)
                (0.00108333 4.4536)
                (0.001125 5.2651)
                (0.00116667 5.256)
                (0.00120833 5.1737)
                (0.00125 3.9213)
            );

            Cd              constant 0.9;

            thetaInner      constant 0.0;
            thetaOuter      constant 10.0;

            sizeDistribution
            {
                type        RosinRammler;

                RosinRammlerDistribution
                {
                    minValue        1e-06;
                    maxValue        0.00015;
                    d               0.00015;
                    n               3;
                }
            }
        }
    }

    dispersionModel none;

    patchInteractionModel standardWallInteraction;

    heatTransferModel RanzMarshall;

    compositionModel singlePhaseMixture;

    phaseChangeModel liquidEvaporationBoil;

    surfaceFilmModel none;

    atomizationModel none;

    breakupModel    ReitzDiwakar; // ReitzKHRT;

    stochasticCollisionModel none;

    radiation       off;

    standardWallInteractionCoeffs
    {
        type            rebound;
    }

    RanzMarshallCoeffs
    {
        BirdCorrection  true;
    }

    singlePhaseMixtureCoeffs
    {
        phases
        (
            liquid
            {
                C7H16               1;
            }
        );
    }

    liquidEvaporationBoilCoeffs
    {
        enthalpyTransfer enthalpyDifference;

        activeLiquids    ( C7H16 );
    }

    ReitzDiwakarCoeffs
    {
        solveOscillationEq yes;
        Cbag            6;
        Cb              0.785;
        Cstrip          0.5;
        Cs              10;
    }

/*
    ReitzKHRTCoeffs
    {
        solveOscillationEq yes;
        B0              0.61;
        B1              40;
        Ctau            1;
        CRT             0.1;
        msLimit         0.2;
        WeberLimit      6;
    }
*/
    TABCoeffs
    {
        y0              0;
        yDot0           0;
        Cmu             10;
        Comega          8;
        WeCrit          12;
    }
}


cloudFunctions
{}


// ************************************************************************* //
Code:
Solving cloud sprayCloud
Cloud: sprayCloud
    Current number of parcels       = 0
    Current mass in system          = 0
    Linear momentum                 = (0 0 0)
   |Linear momentum|                = 0
    Linear kinetic energy           = 0
    Rotational kinetic energy       = 0
    model1:
        number of parcels added     = 108
        mass introduced             = 2.89519e-08
    Parcels absorbed into film      = 0
    New film detached parcels       = 0
    Parcel fate (number, mass)
      - escape                      = 0, 0
      - stick                       = 0, 0
    Temperature min/max             = 0, 0
    Mass transfer phase change      = 2.89521e-08
    D10, D32, Dmax (mu)             = 0, 0, 0
    Liquid penetration 95% mass (m) = 0
Edit: I'm using OpenFOAM 2.2.x

Last edited by Mentalo; May 28, 2013 at 10:11.
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Old   August 13, 2013, 13:15
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Pang
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Hi Mentalo,

Did you manage to solve your problem?

Pang
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Old   August 16, 2013, 04:36
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Hi Pang,

unfortunately not. I guess with the injector on the line of symmetry sprayFoam isn't working properly. At the moment I'm using a full size mesh. But there are some problems with the value of the injected mass as well.

Incorrect introduced mass in sprayFoam?

Best regards,
Mentalo
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Old   August 16, 2013, 04:50
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Pang
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Quote:
Originally Posted by Mentalo View Post
Hi Pang,

unfortunately not. I guess with the injector on the line of symmetry sprayFoam isn't working properly. At the moment I'm using a full size mesh. But there are some problems with the value of the injected mass as well.

Incorrect introduced mass in sprayFoam?

Best regards,
Mentalo
Hi Mentalo,

May I ask what was the angle when you revolve the 2-D grid? ~2 degree?

Regards,
Pang
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Old   August 16, 2013, 04:53
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I'm not sure but I guess I used an overall wedge-angle of less than 5°

Edit: I found my old case set-up, checkMesh says:

Code:
Create time

Create polyMesh for time = 0

Time = 0

Mesh stats
    points:           60601
    internal points:  0
    faces:            120200
    internal faces:   59600
    cells:            30000
    faces per cell:   5.99333                                                                                                                                                  
    boundary patches: 4                                                                                                                                                        
    point zones:      0                                                                                                                                                        
    face zones:       0                                                                                                                                                        
    cell zones:       0                                                                                                                                                        
                                                                                                                                                                               
Overall number of cells of each type:                                                                                                                                          
    hexahedra:     29800                                                                                                                                                       
    prisms:        200                                                                                                                                                         
    wedges:        0                                                                                                                                                           
    pyramids:      0                                                                                                                                                           
    tet wedges:    0                                                                                                                                                           
    tetrahedra:    0                                                                                                                                                           
    polyhedra:     0                                                                                                                                                           
                                                                                                                                                                               
Checking topology...                                                                                                                                                           
    Boundary definition OK.                                                                                                                                                    
    Cell to face addressing OK.                                                                                                                                                
    Point usage OK.                                                                                                                                                            
    Upper triangular ordering OK.                                                                                                                                              
    Face vertices OK.                                                                                                                                                          
    Number of regions: 1 (OK).                                                                                                                                                 
                                                                                                                                                                               
Checking patch topology for multiply connected surfaces...
    Patch               Faces    Points   Surface topology                  
    symmetry            0        0        ok (empty)                        
    walls               600      1200     ok (non-closed singly connected)  
    rotper1             30000    30401    ok (non-closed singly connected)  
    rotper2             30000    30401    ok (non-closed singly connected)  

Checking geometry...
    Overall domain bounding box (0 0 -0.022922) (0.75 0.525 0.022922)
    Mesh (non-empty, non-wedge) directions (1 1 0)
    Mesh (non-empty) directions (1 1 1)
    Wedge rotper1 with angle 2.5 degrees
    Wedge rotper2 with angle 2.5 degrees
    All edges aligned with or perpendicular to non-empty directions.
    Boundary openness (1.11405e-18 9.56709e-15 -4.48611e-13) OK.
    Max cell openness = 3.05315e-16 OK.
    Max aspect ratio = 4 OK.
    Minimum face area = 2.72881e-07. Maximum face area = 0.00022922.  Face area magnitudes OK.
    Min volume = 6.82202e-10. Max volume = 6.28704e-07.  Total volume = 0.00669923.  Cell volumes OK.
    Mesh non-orthogonality Max: 0 average: 0
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 0.330796 OK.
    Coupled point location match (average 0) OK.

Mesh OK.

End
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