forceModel virtualMassForce command¶

Syntax¶

Defined in couplingProperties dictionary.

forceModels
(
    virtualMassForce
);
virtualMassForceProps
{
    velFieldName "U";
    voidfractionFieldName "voidfraction";
    UsFieldName "Us";
    phiFieldName "phi";
    splitUrelCalculation switch1;
    useUs switch2;
    useFelderhof switch3;
    Cadd scalar1;
    treatForceExplicit switch4;
    interpolation switch5;
    smoothingModel "smoothingModel";
}

U = name of the finite volume fluid velocity field
voidfraction = name of the finite volume void fraction field
Us = name of the finite volume cell averaged particle velocity field
phi = name of the finite volume flux field
switch1 = (optional, default false) indicator to split calculation of Urel between CFDEM and LIGGGHTS
switch2 = (optional, default false) indicator to use the cell-averaged particle velocity Us for calculation of Urel
switch3 = (optional, default false) indicator to use the correlation by Felderhof for the virtual mass coefficient
scalar1 = (optional, default 0.5) virtual mass coefficient
switch4 = (optional, default true) sub model switch, see forceSubModel for details
switch5 = (optional, default false) sub model switch, see forceSubModel for details
smoothingModel = name of smoothing model for the DU/Dt field

Examples¶

forceModels
(
    virtualMassForce
);
virtualMassForceProps
{
    velFieldName "U";
    voidfractionFieldName "voidfraction"
    USFieldName "Us"
    phiFieldName "phi";
    smoothingModel off;
}

Description¶

The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The virtualMassForce model calculates the virtual mass force for each particle.

For more detail, see Nijssen et al. (2020).

(Nijssen2020) T.M.J. Nijssen, J.A.M. Kuipers, J. van der Stel, A.T. Adema, K.A. Buist. (2020): “Complete liquid-solid momentum coupling for unresolved CFD-DEM simulations”, International Journal of Multiphase Flow

Restrictions¶

Warning

Model not validated!