drag force in dragModel.C

[kimy]

Hi, everyone. I am confused that the expression of drag force used in Openfoam, as shown in the following codes. Why there is nu and divided by square of particle diameter. I saw the formula is without nu and only divided by diameter in some literature. Do you have any tip for me? Thanks a lot. By the way, After I deleted pair_.continuous().nu() and only divided by diameter. The results I obtained are totally the same.

Foam::tmp<Foam::volScalarField> Foam::dragModel::Ki() const
{
    return
        0.75
       *CdRe()
       *swarmCorrection_->Cs()
       *pair_.continuous().rho()
       *pair_.continuous().nu()
       /sqr(pair_.dispersed().d());
}

[李东岳]

75最前面

[kimy]

Thanks a lot, Dongyue. Very helpful. I found in SN model CdRe was multiplied by another Re. Thus, the formula is consistent.