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-   -   How to define particle-wall restitution coefficient in Eulerian multiphase model ? (http://www.cfd-online.com/Forums/fluent/88933-how-define-particle-wall-restitution-coefficient-eulerian-multiphase-model.html)

sangramroy May 30, 2011 23:35

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


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