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Implemented hard-coded collision model and parameters.

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Interaction list range still hard-coded.
This commit is contained in:
graham
2009-08-21 15:45:57 +01:00
parent 5fb21c8139
commit f7dbe72c22
1 changed files with 35 additions and 6 deletions
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41
src/lagrangian/intermediate/submodels/Kinematic/CollisionModel/DeterministicPairForce/DeterministicPairForce.C
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@ -54,9 +54,38 @@ void Foam::DeterministicPairForce<CloudType>::evaluatePair
typename CloudType::parcelType& pB typename CloudType::parcelType& pB
) const ) const
{ {
Info<< "PARTICLE FORCES HARD CODED AS TEST" << endl; vector deltaP = (pB.position() - pA.position());
pA.f() += -20.0*pB.mass()*pB.U();
pB.f() += -20.0*pA.mass()*pA.U(); scalar deltaN = 0.5*(pA.d() + pB.d()) - mag(deltaP);
if (deltaN > 0)
{
//Particles in collision
vector n = deltaP/mag(deltaP);
vector Urel = pA.U() - pB.U();
// Effective radius
scalar R = 0.5*pA.d()*pB.d()/(pA.d() + pB.d());
// Effective mass
scalar M = pA.mass()*pB.mass()/(pA.mass() + pB.mass());
scalar E = 5e3;
scalar sigma = 0.25;
scalar alpha = 0.2;
scalar b = 1.0;
scalar Estar = E/(2.0*(1-sqr(sigma)));
scalar kN = (4.0/3.0)*sqrt(R)*Estar;
scalar etaN = alpha*sqrt(M*kN)*pow(deltaN, 0.25);
vector normalForce = -(kN*pow(deltaN, b) + etaN*(Urel & n))*n;
pA.f() += normalForce;
pB.f() -= normalForce;
}
} }
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * // // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
@ -70,7 +99,7 @@ Foam::DeterministicPairForce<CloudType>::DeterministicPairForce
: :
CollisionModel<CloudType>(dict, owner, typeName), CollisionModel<CloudType>(dict, owner, typeName),
cellOccupancy_(owner.mesh().nCells()), cellOccupancy_(owner.mesh().nCells()),
il_(owner.mesh(), 1e-6, false) il_(owner.mesh(), 1e-8, true)
{ {
Info<< "SEARCH DISTANCE SQR HARD CODED" << endl; Info<< "SEARCH DISTANCE SQR HARD CODED" << endl;
} }
@ -146,8 +175,8 @@ void Foam::DeterministicPairForce<CloudType>::collide()
} }
} }
Info<< "ADD COLLISIONS WITH WALLS HERE, DOES NOT NEED TO BE A TRACKING" Info<< "ADD COLLISIONS WITH WALLS HERE, DOES NOT NEED TO BE A TRACKING "
<< "OPERATION. CALCULATE DISTANCE TO SURFACES OF WALL TYPE AND APPLY" << "OPERATION. CALCULATE DISTANCE TO SURFACES OF WALL TYPE AND APPLY "
<< "WALL FORCE MODEL" << endl; << "WALL FORCE MODEL" << endl;
} }