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openFOAM dense particle - cloud properties

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Old   December 27, 2022, 08:21
Default openFOAM dense particle - cloud properties
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Luca
Join Date: Nov 2022
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Hi to everyone, i'm new with openfoam and i need help to understand better how to set values of cloud properties, in order to generate particles in my simulation.


what is the relations beetwen the values parcelspersecond, n of parcels and the other values? the system take into account a priority value respect than another one?


this is just an example cause i need to implement a metal powder bed, so a lot of particles of micron size.














/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 10
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
location "constant";
object cloudProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

type cloud;

solution
{
active true;
coupled false;
transient yes;
cellValueSourceCorrection off;
maxCo 0.5;

interpolationSchemes
{
rho cell;
U cellPoint;
mu cell;
}

integrationSchemes
{
U Euler;
}
}

constantProperties
{
rho0 3030;
youngsModulus 9e10;
poissonsRatio 0.30;
}

subModels
{
particleForces
{
sphereDrag;
gravity;
}

injectionModels
{

model
{
type patchInjection;
patchName Plate;
duration 0.05;
concentration 0.6; // parcel concentration in my fluid?
parcelsPerSecond 20000;
flowRateProfile constant 1;
meanParticleDiameter 0.0003; // for what?

nParticle 10000; // number of particles to be injected

massTotal 0.5; //total mass to be injected (kg)

parcelBasisType number; // options of how to represent your particles. besides 'fixed' they can be represented by 'number' or 'mass'
SOI 0; // start of injection (time)
U0 (0 0 0.0001 );
sizeDistribution
{
type fixedValue; // particle have fixed sizes Yes
fixedValueDistribution // the sizes the particels can have ? Yes. Instead of specifying each individual size you could use a size distribution profile i.e. type normal;
{
value 0.0006;
/*value 0.01;
value 0.001;
value 0.015;
value 0.004;
value 0.009; */
}
}
}
}

dispersionModel none;

patchInteractionModel localInteraction;

localInteractionCoeffs
{
patches
(



Plate
{
type rebound;
e 0.97;
mu 0.09;
}
wall
{
type rebound;
e 0.97;
mu 0.09;
}
Sc1
{
type rebound;
e 0.97;
mu 0.09;
}
Inlet
{
type rebound;
e 0.97;
mu 0.09;
}
Outlet
{
type escape;
}

);
}

surfaceFilmModel none;

stochasticCollisionModel none;

collisionModel pairCollision;

pairCollisionCoeffs
{
// Maximum possible particle diameter expected at any time
maxInteractionDistance 0.006;

writeReferredParticleCloud no;

pairModel pairSpringSliderDashpot;

pairSpringSliderDashpotCoeffs
{
useEquivalentSize no;
alpha 0.12;
b 1.5;
mu 0.52;
cohesionEnergyDensity 0;
collisionResolutionSteps 12;
};

wallModel wallLocalSpringSliderDashpot;

wallLocalSpringSliderDashpotCoeffs
{
useEquivalentSize no;
collisionResolutionSteps 12;
wall
{
youngsModulus 1e10;
poissonsRatio 0.23;
alpha 0.12;
b 1.5;
mu 0.43;
cohesionEnergyDensity 0;
}

};
}
}


cloudFunctions
{}


// ************************************************** *********************** //
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cloud properties, dense particles, particles, powder, powder bed fusion

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