Foam::forceSuSp Foam::DPMDragModels::ErgunWenYu<CloudType>::calcCoupled
(
const typename CloudType::parcelType& p,
const scalar dt,
const scalar mass,
const scalar Re,
const scalar muc
) const
{
scalar alphac(alphac_[p.cell()]);
if (alphac < 0.8)
{
return forceSuSp
(
vector::zero,
(mass/p.rho())
*((150.0*(1.0 - alphac) + 1.75*Re)*muc/(alphac*sqr(p.d())))
);
}
else
{
return forceSuSp
(
vector::zero,
(mass/p.rho())
*0.75*CdRe(alphac*Re)*muc*pow(alphac, -2.65)/sqr(p.d())
);
}
}
Foam::forceSuSp Foam::SphereDragForce<CloudType>::calcCoupled
(
const typename CloudType::parcelType& p,
const scalar dt,
const scalar mass,
const scalar Re,
const scalar muc
) const
{
forceSuSp value(vector::zero, 0.0);
value.Sp() = mass*0.75*muc*CdRe(Re)/(p.rho()*sqr(p.d()));
return value;
}
Foam::forceSuSp Foam::WenYuDragForce<CloudType>::calcCoupled
(
const typename CloudType::parcelType& p,
const scalar dt,
const scalar mass,
const scalar Re,
const scalar muc
) const
{
scalar alphac(alphac_[p.cell()]);
return forceSuSp
(
vector::zero,
(mass/p.rho())
*0.75*CdRe(alphac*Re)*muc*pow(alphac, -2.65)/(alphac*sqr(p.d()))
);
}
Foam::tmp<Foam::volScalarField>
Foam::microDragClosures::IshiiZuber::CdRe() const
{
volScalarField Re(pair_.Re());
volScalarField Eo(pair_.Eo());
volScalarField mud(pair_.dispersed().mu());
volScalarField muc(pair_.continuous().mu());
volScalarField muStar((mud + 0.4*muc)/(mud + muc));
volScalarField muMix
(
muc
*pow(max(1 - pair_.dispersed(), scalar(1e-3)), -2.5*muStar)
);
volScalarField ReM(Re*muc/muMix);
volScalarField CdRe
(
pos(1000 - ReM)*24.0*(scalar(1) + 0.15*pow(ReM, 0.687))
+ neg(1000 - ReM)*0.44*ReM
);
volScalarField F((muc/muMix)*sqrt(1 - pair_.dispersed()));
F.max(1e-3);
volScalarField Ealpha((1 + 17.67*pow(F, 0.8571428))/(18.67*F));
volScalarField CdReEllipse(Ealpha*0.6666*sqrt(Eo)*Re);
return
pos(CdReEllipse - CdRe)
*min(CdReEllipse, Re*sqr(1 - pair_.dispersed())*2.66667)
+ neg(CdReEllipse - CdRe)*CdRe;
}
