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51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
"CFDEMproject WWW Site"_lws - "CFDEM Commands"_lc :c
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:link(lws,http://www.cfdem.com)
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:link(lc,CFDEMcoupling_Manual.html#comm)
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:line
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voidfractionModel_bigParticleVoidFraction command :h3
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[Syntax:]
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Defined in couplingProperties dictionary.
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voidfractionModel bigParticle;
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bigParticleProps
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\{
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maxCellsPerParticle number1;
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alphaMin number2;
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scaleUpVol number3;
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\} :pre
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{number1} = max number of cells covered by a partilce (search will fail when more than {number1} cells are covered by the particle) :ulb,l
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{number2} = mininmum limit for voidfraction :l
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{number3} = diameter of the particle's representation is artificially increased according to {number3} * Vparticle, volume remains unaltered! :l
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:ule
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[Examples:]
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voidfractionModel bigParticle;
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bigParticleProps
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\{
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maxCellsPerParticle 1000;
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alphaMin 0.10;
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scaleUpVol 5.0;
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\} :pre
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[Description:]
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The bigParticle voidFraction model is supposed to be used when a particle (or it's representation) is bigger than a CFD cell. The voidfraction field is set in those cell whose centres are inside the particle which results in a stairstep representation of the bodies within the mesh (i.e. voidfraction is either 1 (fluid) of zero (solid)). For archiving accurate results, approx. 8 cells per particle diameter are necessary.
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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.
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Code of this sub-model contributed by Alice Hager, JKU.
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[Restrictions:] none.
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[Related commands:]
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"voidfractionModel"_voidfractionModel.html
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