forceModel GidaspowDrag command¶

Syntax¶

Defined in couplingProperties dictionary.

forceModels
(
    GidaspowDrag
);
GidaspowDragProps
{
    velFieldName          "U";
    voidfractionFieldName "voidfraction";
    granVelFieldName      "Us";
    phi                   scalar1;
    scale                 scalar2;
    scaleDrag             scalar3;
    switchingVoidfraction scalar4;
    treatForceExplicit    switch1;
    implForceDEM          switch2;
    verbose               switch3;
    interpolation         switch4;
    scalarViscosity       switch5;
}

• 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

• scalar1 = drag correction factor (in doubt 1)

• scalar2 = (optional, default 1.0) 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.

• scalar3 = (optional, default 1.0) scaling of drag law

• scalar4 = (optional, default 0.8) void fraction above which dilute formulation will be used

• switch1 = (optional, default false) sub model switch, see forceSubModel for details

• switch2 = (optional, default false) flag to use implicit formulation of drag on DEM side

• switch3 = (optional, default false) sub model switch, see forceSubModel for details

• switch4 = (optional, default false) flag to use interpolated void fraction and fluid velocity values

• switch5 = (optional, default false) sub model switch, see forceSubModel for details

Examples¶

forceModels
(
    GidaspowDrag
);
GidaspowDragProps
{
    velFieldName          "U";
    voidfractionFieldName "voidfraction";
    granVelFieldName      "Us";
}

Description¶

The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The GidaspowDrag model is a model that calculates the particle based drag force following the correlation of Gidaspow which is a combination of Ergun (1952) and Wen & Yu (1966) (see Zhu et al. (2007): “Discrete particle simulation of particulate systems: Theoretical developments”, ChemEngScience).

Restrictions¶

none

Related commands¶

forceModel