voidFractionModel IB command¶

Syntax¶

Defined in couplingProperties dictionary.

voidFractionModel IB;
IBProps
{
    maxCellsPerParticle number1;
    alphaMin            number2;
    scaleUpVol          number3;
}

• number1 = maximum number of cells covered by a particle (search will fail when more than number1 cells are covered by the particle)

• number2 = minimum limit for void fraction

• number3 = diameter of the particle’s representation is artificially increased according to number3 * Vparticle, volume remains unaltered!

Examples¶

voidFractionModel IB;
IBProps
{
    maxCellsPerParticle 1000;
    alphaMin            0.10;
    scaleUpVol          5.0;
}

Description¶

The IB void fraction model is supposed to be used when a particle (or its representation) is bigger than a CFD cell. The void fraction field is set in those cell whose centres are inside the particle. The model is specially designed for cfdemSolverIB and creates a smooth transition of the void fraction at the particle surface. Cells which are only partially covered by solid are marked by void fraction values between 0 and 1 respectively.

The region of influence of a particle can be increased artificially by “scaleUpVol”, which blows up the particles, but keeps their volume (for void fraction calculation) constant.

Code of this sub-model was contributed by Alice Hager, JKU.

Restrictions¶

none

Related commands¶

voidFractionModel