voidfractionModel

Syntax

Defined in couplingProperties dictionary.

voidfractionModel model;

model = name of the voidfractionModel to be applied

Examples

voidfractionModel centre;

Description

voidFraction models compute the voidfraction $\phi$ in each CFd cell, i.e. the ratio

$\phi = \frac{V_\mathrm{c} - V_\mathrm{p}}{V_\mathrm{c}}$

with $V_\mathrm{c}$ being the volume of the CFD cell and $V_\mathrm{p}$ the total volume of all particles in that cell.

The voidfractionModel is the base class for models to represent the DEM particle’s volume in the CFD domain via a voidfraction field.

`useDDTvoidfraction`

When useDDTvoidfraction is enabled you can specify a mask to limit the region where the ddt(voidfraction) component is applied. The maskingRegion is specified as as sub-dictionary in the properties dictionary for the voidfractionModel used.

<voidfractionModel>Props
{
    ddtVoidfractionProps
    {
        maskingRegion
        {
            type    <regionType>;
            name    <regionName>;
        }
    }
}

type : either cellZone to specify the region to exclude using a cellZone or none to not exclude any region (default: none)
name : the name of the region, i.e. the cellZone (required when type is cellZone)

Example:

dividedProps
{
    ddtVoidfractionProps
    {
        maskingRegion
        {
            type    cellZone;
            name    excludedCellZone;
        }
    }
}

Restrictions

None.

Default: none.