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[Klaus Thoeni <klaus.thoeni@xxxxxxxxx>]

Hi Daniela,

if you want to use non viscous damping which is applied to each particle 
(corresponds to local damping in PFC with slightly modified equation) then you 
have to specify your damping coefficient in Newtonintegrator, e.g.

O.engines=[
	...
	InteractionLoop(
        [Ig2_Sphere_Sphere_L6Geom(),Ig2_Facet_Sphere_L3Geom()],
        [Ip2_FrictMat_FrictMat_FrictPhys()],
        [Law2_L3Geom_FrictPhys_ElPerfPl()]
 	),
	GravityEngine(...),
	NewtonIntegrator(damping=0.2),
	...
]

HTH

Klaus

On Mon, 17 Oct 2011 05:15:49 AM Daniela wrote:
> New question #174738 on Yade:
> https://answers.launchpad.net/yade/+question/174738
> 
> Hi,
> 
> I would like to make a damping study in my model, but I don't know how. I
> am using :
> 
> O.materials.append(FrictMat(young=1e7,poisson=.25,frictionAngle=0.5,density
> =2000,label='mat1'))
> 
> but I do not see the option to change the damping here.
> 
> Does I need to make some change in the interaction loop? I am using this
> one:
> 
> InteractionLoop(
>         [Ig2_Sphere_Sphere_L6Geom(),Ig2_Facet_Sphere_L3Geom()],
>         [Ip2_FrictMat_FrictMat_FrictPhys()],
>         [Law2_L3Geom_FrictPhys_ElPerfPl()]
> 	)
> 
> Thanks in advance for the feedback.
> Daniela