forceModel ParmarBassetForce command¶

Syntax¶

Defined in couplingProperties dictionary.

forceModels
(
    ParmarBassetForce
);
ParmarBassetForceProps
{
    velFieldName        "U";
    UsFieldName         "Us";
    nIntegral           scalar1;
    discretisationOrder scalar2;
    treatForceExplicit  switch1;
    verbose             switch2;
    interpolation       switch3;
    smoothingModel      "smoothingModel";
}

U = name of the finite volume fluid velocity field
Us = name of the finite volume cell averaged particle velocity field
scalar1 = number of timesteps considered in the near history (integer > 1) scalar2 = (optional, default 1) discretisation order of the far history differential equations (1 or 2)
switch1 = (optional, default true) sub model switch, see forceSubModel for details
switch2 = (optional, default false) sub model switch, see forceSubModel for details
switch3 = (optional, default false) sub model switch, see forceSubModel for details
smoothingModel = name of smoothing model for the dUrel/dt field

Examples¶

forceModels
(
    ParmarBassetForce
);
ParmarBassetForceProps
{
    velFieldName        "U";
    USFieldName         "Us"
    nIntegral           10;
    discretisationOrder 1;
    smoothingModel      constDiffAndTemporalSmoothing;
    constDiffAndTemporalSmoothingProps
    {
        lowerLimit          1e-8;
        upperLimit          1e8;
        smoothingLength     0.1;
        smoothingStrength   0.001;
        correctBoundary     true;
    }
}

Description¶

The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The ParmarBassetForce model calculates the Basset history force for each particle, based on the method by Parmar et al. (2018).

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

(Parmar2018) M. Parmar, S. Annamalai, S. Balachandar, A. Prosperetti. (2018): “Differential Formulation of the Viscous History Force on a Particle for Efficient and Accurate Computation”, Journal of Fluid Mechanics

(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!