forceModel_KochHillDrag command

Syntax

Defined in couplingProperties dictionary.

forceModels
(
    KochHillDrag
);
KochHillDragProps
{
    velFieldName "U";
    voidfractionFieldName "voidfraction";
    granVelFieldName "Us"
    interpolation       "switch1";
    voidfractionInterpolationType "type1"
    UInterpolationType  "type2"
    implForceDEM        "switch2";
    suppressProbe       "switch3";
    scale               "scalar1";
    scaleDrag           "scalar2";
    treatForceExplicit  "switch4";
    verbose             "switch5";
    implForceDEMaccumulated "switch6";
    scalarViscosity     "switch7";
    nu                  "scalar3";
};

• U = name of the finite volume fluid velocity field
• voidfraction = name of the finite volume voidfraction field
• Us = (optional) name of finite volume granular velocity field
• switch1 = (optional, normally off) flag to use interpolated voidfraction and fluid velocity values
• type1 = (optional, default cellPoint) interpolation type for voidfraction field
• type2 = (optional, default cellPointFace) interpolation type for velocity field
• switch2 = (optional, normally off) flag to use implicit formulation of drag on DEM side switch3 = (optional, default false) can be used to suppress the output of the probe model
• scalar1 = (optional) scaling of particle diameter: d_sim=scale*d_real. d_sim=(potentially coarse grained) particle diameter. scale=coarse graining factor. d_real= particle diameter as it is measured.
• scalar2 = (optional) scaling of drag law
• switch4 = (optional, default false) sub model switch, see forceSubModel for details
• switch5 = (optional, default false) sub model switch, see forceSubModel for details
• switch6 = (optional, default false) sub model switch, see forceSubModel for details
• switch7 = (optional, default false) sub model switch, see forceSubModel for details
• scalar3 = optional, only if switch7 is true

Examples

forceModels
(
    KochHillDrag
);
KochHillDragProps
{
    velFieldName "U";
    voidfractionFieldName "voidfraction";
}

Description

The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The KochHillDrag model is a model that calculates the particle based drag force following the correlation of Koch & Hill (2001) (see van Buijtenen et al. (2011): “Numerical and experimental study on multiple-spout fluidized beds”, ChemEngScience).

Restrictions

none.

Related commands

forceModel