102 lines
3.2 KiB
HTML
102 lines
3.2 KiB
HTML
<HTML>
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<CENTER><A HREF = "http://www.cfdem.com">CFDEMproject WWW Site</A> - <A HREF = "CFDEMcoupling_Manual.html#comm">CFDEM Commands</A>
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<HR>
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<H3>forceModel_GidaspowDrag command
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</H3>
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<P><B>Syntax:</B>
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</P>
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<P>Defined in couplingProperties dictionary.
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</P>
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<PRE>forceModels
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(
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GidaspowDrag
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);
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GidaspowDragProps
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{
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velFieldName "U";
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voidfractionFieldName "voidfraction";
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granVelFieldName "Us";
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phi scalar1;
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interpolation switch1;
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voidfractionInterpolationType "type1"
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UInterpolationType "type2"
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implForceDEM switch2;
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suppressProbe switch3;
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scale scalar2;
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scaleDrag scalar3;
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switchingVoidfraction scalar4;
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treatForceExplicit switch4;
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implForceDEM switch5;
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verbose switch6;
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scalarViscosity switch7;
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nu scalar5;
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};
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</PRE>
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<UL><LI><I>U</I> = name of the finite volume fluid velocity field
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<LI><I>voidfraction</I> = name of the finite volume voidfraction field
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<LI><I>Us</I> = name of the finite volume cell averaged particle velocity field
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<LI><I>scalar1</I> = drag correction factor (in doubt 1)
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<LI><I>switch1</I> = (optional, default off) flag to use interpolated voidfraction and fluid velocity values
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<LI><I>type1</I> = (optional, default cellPoint) interpolation type for voidfraction field
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<LI><I>type2</I> = (optional, default cellPointFace) interpolation type for velocity field
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<LI><I>switch2</I> = (optional, default false) flag to use implicit formulation of drag on DEM side:l
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<I>switch3</I> = (optional, default false) can be used to suppress the output of the probe model
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<LI><I>scalar2</I> = (optional) scaling of particle diameter
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<LI><I>scalar3</I> = (optional) scaling of drag law
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<LI><I>scalar4</I> = (optional) voidfraction above which dilute formulation will be used
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<LI><I>switch4</I> = (optional, default false) sub model switch, see <A HREF = "forceSubModel.html">forceSubModel</A> for details
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<LI><I>switch5</I> = (optional, default false) sub model switch, see <A HREF = "forceSubModel.html">forceSubModel</A> for details
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<LI><I>switch6</I> = (optional, default false) sub model switch, see <A HREF = "forceSubModel.html">forceSubModel</A> for details
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<LI><I>switch7</I> = (optional, default false) sub model switch, see <A HREF = "forceSubModel.html">forceSubModel</A> for details
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<LI><I>scalar5</I> = (optional, default false) optional, only if switch6 is true
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</UL>
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<P><B>Examples:</B>
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</P>
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<PRE>forceModels
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(
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GidaspowDrag
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);
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GidaspowDragProps
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{
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velFieldName "U";
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voidfractionFieldName "voidfraction";
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granVelFieldName "Us";
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}
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</PRE>
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<P><B>Description:</B>
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</P>
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<P>The force model performs the calculation of forces (e.g. fluid-particle interaction forces) acting on each DEM particle. The GidaspowDrag model is a model that calculates the particle based drag force following the correlation of Gidaspow which is a combination of Ergun (1952) and Wen & Yu (1966) (see Zhu et al. (2007): "Discrete particle simulation of particulate systems: Theoretical developments", ChemEngScience).
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</P>
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<P><B>Restrictions:</B>
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</P>
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<P>none.
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</P>
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<P><B>Related commands:</B>
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</P>
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<P><A HREF = "forceModel.html">forceModel</A>
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</P>
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</HTML>
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