Eulerian model and (friction) packing limit

August 18, 2008, 09:22

Can anyone please explain me difference between Friction Packing Limit and Packing Limit?

Greetings, Rok

DungPham · September 4, 2008, 05:41

Hello,

the Packing Limit is the maximun packing fraction you want to allow in your simulation.

When the packing fraction is higher than the value fixed for the Friction Packing Limit, FLUENT adds the contribution from Frictional Viscosity to the other viscosities (bulk, collisional, granular). You have to choose a model or fix a constant value (or a UDF). IF Friction Packing Limit=Packing Limit then Frictional Viscosity will be equal to 0 always.

I have obtained better results choosing Johnson model for Frictional Viscosity and Solids Pressure.

Hope it will help,

Roberto

shahid nadeem · January 30, 2014, 03:03

Mr Robert
can you tell me what is packing fraction

August 18, 2008, 09:22	Eulerian model and (friction) packing limit	#1
Rok Sibanc Guest Posts: n/a	Can anyone please explain me difference between Friction Packing Limit and Packing Limit? Greetings, Rok

September 4, 2008, 05:41	Re: Eulerian model and (friction) packing limit	#2
Roberto Arevalo Guest Posts: n/a	Hello, the Packing Limit is the maximun packing fraction you want to allow in your simulation. When the packing fraction is higher than the value fixed for the Friction Packing Limit, FLUENT adds the contribution from Frictional Viscosity to the other viscosities (bulk, collisional, granular). You have to choose a model or fix a constant value (or a UDF). IF Friction Packing Limit=Packing Limit then Frictional Viscosity will be equal to 0 always. I have obtained better results choosing Johnson model for Frictional Viscosity and Solids Pressure. Hope it will help, Roberto DungPham, coolgame2004 and mansoori like this.

January 30, 2014, 03:03	Packing Fraction	#3
shahid nadeem Member Nazim Join Date: Oct 2013 Posts: 93 Rep Power: 13	Mr Robert can you tell me what is packing fraction

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