forceModel_GidaspowDrag command¶
Syntax¶
Defined in couplingProperties dictionary.
forceModels
(
GidaspowDrag
);
GidaspowDragProps
{
velFieldName "U";
voidfractionFieldName "voidfraction";
granVelFieldName "Us";
phi scalar1;
interpolation switch1;
voidfractionInterpolationType "type1"
UInterpolationType "type2"
implForceDEM switch2;
suppressProbe switch3;
scale scalar2;
scaleDrag scalar3;
switchingVoidfraction scalar4;
treatForceExplicit switch4;
implForceDEM switch5;
verbose switch6;
scalarViscosity switch7;
nu scalar5;
};
- U = name of the finite volume fluid velocity field
- voidfraction = name of the finite volume voidfraction field
- Us = name of the finite volume cell averaged particle velocity field
- scalar1 = (optional, default 1) drag correction factor
- switch1 = (optional, default 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, default false) 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
- scalar2 = (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.
- scalar3 = (optional) scaling of drag law
- scalar4 = (optional) voidfraction above which dilute formulation will be used
- 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
- scalar5 = (optional, default false) optional, only if switch6 is true
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.