"CFDEMproject WWW Site"_lws - "CFDEM Commands"_lc :c

:link(lws,http://www.cfdem.com)
:link(lc,CFDEMcoupling_Manual.html#comm)

:line

voidfractionModel_IBVoidFraction command :h3

[Syntax:]

Defined in couplingProperties dictionary.

voidfractionModel IB;
IBProps
\{
    maxCellsPerParticle number1;
    alphaMin number2;
    scaleUpVol number3;
\} :pre

{number1} = maximum number of cells covered by a particle (search will fail when more than {number1} cells are covered by the particle) :ulb,l
{number2} = minimum limit for voidfraction :l
{number3} = diameter of the particle's representation is artificially increased according to {number3} * Vparticle, volume remains unaltered! :l
:ule

[Examples:]

voidfractionModel IB;
IBProps
\{
    maxCellsPerParticle 1000;
    alphaMin 0.10;
    scaleUpVol 5.0;
\} :pre

[Description:]

The IB voidFraction model is supposed to be used when a particle (or its representation) is bigger than a CFD cell. The voidfraction 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 voidfraction at the particle surface. Cells which are only partially covered by solid are marked by voidfraction 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 voidfraction calculation) constant.

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

[Restrictions:] none.

[Related commands:]

"voidfractionModel"_voidfractionModel.html