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67 lines
2.0 KiB
Plaintext
67 lines
2.0 KiB
Plaintext
"CFDEMproject Website"_lws - "Main Page"_main :c
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:link(lws,http://www.cfdem.com)
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:link(main,CFDEMcoupling_Manual.html)
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:line
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voidFractionModel bigParticle command :h3
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[Syntax:]
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Defined in "couplingProperties"_CFDEMcoupling_dicts.html#couplingProperties
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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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weight number3;
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porosity number4;
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\} :pre
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{number1} = maximum number of cells covered by a particle (search will fail when more than {number1} cells are covered by the particle) :ulb,l
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{number2} = minimum limit for void fraction :l
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{number3} = (optional, default 1.0) scaling of the particle volume to account for porosity or agglomerations. :l
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{number4} = (optional, default 1.0) diameter of the particle's representation is artificially increased according to {number2} * 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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weight 1.0;
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porosity 5.0;
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\} :pre
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[Description:]
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The {bigParticle} void fraction model is supposed to be used when a particle (or
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its representation) is bigger than a CFD cell. The void fraction field is set in
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those cell whose centres are inside the particle which results in a stairstep
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representation of the bodies within the mesh (i.e. void fraction is either 1
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(fluid) of zero (solid)). For archiving accurate results, approx. 8 cells per
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particle diameter are necessary.
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The region of influence of a particle can be increased artificially by
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"porosity", which blows up the particles, but keeps their volume (for
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void fraction calculation) constant.
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The particle volume occupied in the CFD domain can be adjusted by the parameter
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"weight", using Vparticle=dsphere^3*pi/6*weight.
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Parts of this sub-model were contributed by Alice Hager, JKU.
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[Restrictions:]
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none
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[Related commands:]
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"voidFractionModel"_voidFractionModel.html
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