particle - wall collision ( urgent)

Angeline · November 8, 2010, 01:47

hi guys,
I need some assistance on eulerian two fluid model for gas- solid flow . Is it possible to define the coeffcient of restitution for wall - particle collsion. I am not finding that in fluent. Its a different value than particle-partice collsion.

jlipow · November 8, 2010, 05:17

Hi,
if you're using to the dense discrete particle model, the restitution coefficients of the discrete phase are accessible under
Boundary Conditions -> [BC][Phase: mixture] -> Edit... -> DPM tab

jlipow

Angeline · November 9, 2010, 02:06

but in eulerian-eulerian approach , how can i specify this???

please reply anyone , its urgent...

Thanks in advance.........

jlipow · November 9, 2010, 03:34

I don't think that a restitution coefficient can be set in pure Euler/Euler, as the solid phase is not fully modeled as a collective of discrete particles in this approach.

Either you'll have to work with the specularity coefficient found under:Boundary Conditions -> [BC][Phase: phase-2] -> Edit... -> Momentum tab
or you'll have to switch to another model which resolves the solid phase as discrete particles (DPM/DDPM).

jlipow

November 8, 2010, 01:47	particle - wall collision ( urgent)	#1
Angeline New Member Angie Join Date: Nov 2010 Posts: 17 Rep Power: 16	hi guys, I need some assistance on eulerian two fluid model for gas- solid flow . Is it possible to define the coeffcient of restitution for wall - particle collsion. I am not finding that in fluent. Its a different value than particle-partice collsion.

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November 8, 2010, 05:17		#2
jlipow New Member J. Lipowsky Join Date: Nov 2010 Posts: 4 Rep Power: 16	Hi, if you're using to the dense discrete particle model, the restitution coefficients of the discrete phase are accessible under Boundary Conditions -> [BC][Phase: mixture] -> Edit... -> DPM tab jlipow

November 9, 2010, 02:06		#3
Angeline New Member Angie Join Date: Nov 2010 Posts: 17 Rep Power: 16	but in eulerian-eulerian approach , how can i specify this??? please reply anyone , its urgent... Thanks in advance.........

November 9, 2010, 03:34		#4
jlipow New Member J. Lipowsky Join Date: Nov 2010 Posts: 4 Rep Power: 16	I don't think that a restitution coefficient can be set in pure Euler/Euler, as the solid phase is not fully modeled as a collective of discrete particles in this approach. Either you'll have to work with the specularity coefficient found under:Boundary Conditions -> [BC][Phase: phase-2] -> Edit... -> Momentum tab or you'll have to switch to another model which resolves the solid phase as discrete particles (DPM/DDPM). jlipow