How to define particle-wall restitution coefficient in Eulerian multiphase model ?

sangramroy · May 30, 2011, 23:35

Hi,
I am using Eulerian multiphase along with granular model to simulate a circulating fluidized bed. Where do I specify the value for particle-wall restituition coefficient?

Thanks

Angeline · May 31, 2011, 03:32

hi,

you cannot define it. Instead use specularity coeffcient.

sangramroy · May 31, 2011, 03:57

Is there any relation between specularity coefficient and particle-wall restitution coefficient?

Angeline · June 1, 2011, 01:59

I am not sure about this............May be some UDF can be written....

sangramroy · June 1, 2011, 02:05

hi,

Many results on simulation have been published using both 'particle-particle restitution coeffcient' and 'particle-wall restitution coeffcient' along with 'specularity coefficient'. I am just wondering how is it possible. Are you sure that one cannot specify 'particle-wall coefficient' ?

Thanks

snow · June 1, 2011, 06:29

define -> phases, select secondary phase, set and set Granular Temperature Model to Partial Differential Equation

now you can set coefficient of restitution under Boundary Conditions, wall (for second phase) under multiphase.

sangramroy · June 1, 2011, 06:32

Thanks a lot...!

May 30, 2011, 23:35	How to define particle-wall restitution coefficient in Eulerian multiphase model ?	#1
sangramroy New Member Sangram Roy Join Date: Jul 2010 Posts: 18 Rep Power: 15	Hi, I am using Eulerian multiphase along with granular model to simulate a circulating fluidized bed. Where do I specify the value for particle-wall restituition coefficient? Thanks

June 1, 2011, 06:29		#6
snow New Member Rok Sibanc Join Date: Sep 2009 Posts: 9 Rep Power: 16	define -> phases, select secondary phase, set and set Granular Temperature Model to Partial Differential Equation now you can set coefficient of restitution under Boundary Conditions, wall (for second phase) under multiphase. zino, mohsen0488 and coolgame2004 like this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Effect of restitution coefficient: Eulerian model	Kushagra Mittal	CFX	0	August 6, 2007 23:11
about compresive phase	James	CFX	10	September 12, 2006 03:16
Two-Phase Buoyant Flow Issue	Miguel Baritto	CFX	4	August 31, 2006 12:02
particle tracking	mike	CFX	3	April 17, 2006 00:05
Eulerian multiphase model with multicomponents?	Shankar	FLUENT	1	July 4, 2002 04:36

May 31, 2011, 03:32		#2
Angeline New Member Angie Join Date: Nov 2010 Posts: 17 Rep Power: 15	hi, you cannot define it. Instead use specularity coeffcient.

May 31, 2011, 03:57		#3
sangramroy New Member Sangram Roy Join Date: Jul 2010 Posts: 18 Rep Power: 15	Is there any relation between specularity coefficient and particle-wall restitution coefficient?

June 1, 2011, 01:59		#4
Angeline New Member Angie Join Date: Nov 2010 Posts: 17 Rep Power: 15	I am not sure about this............May be some UDF can be written....

June 1, 2011, 02:05		#5
sangramroy New Member Sangram Roy Join Date: Jul 2010 Posts: 18 Rep Power: 15	hi, Many results on simulation have been published using both 'particle-particle restitution coeffcient' and 'particle-wall restitution coeffcient' along with 'specularity coefficient'. I am just wondering how is it possible. Are you sure that one cannot specify 'particle-wall coefficient' ? Thanks

June 1, 2011, 06:32		#7
sangramroy New Member Sangram Roy Join Date: Jul 2010 Posts: 18 Rep Power: 15	Thanks a lot...!