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[Chiara Modenese <question172345@xxxxxxxxxxxxxxxxxxxxx>]

Question #172345 on Yade changed:
https://answers.launchpad.net/yade/+question/172345

    Status: Open => Answered

Chiara Modenese proposed the following answer:
By running your script I get:
O.interactions.countReal() = 29 # this is the total number of interactions
which are real
utils.avgNumInteractions() = 4.1428571428571432 # this is the coordination
number (so called apparent or average CN)

Did you find a problem while using the above functions?

Chiara




On 26 September 2011 13:20, ceguo <question172345@xxxxxxxxxxxxxxxxxxxxx>wrote:

> Question #172345 on Yade changed:
> https://answers.launchpad.net/yade/+question/172345
>
>    Status: Answered => Open
>
> ceguo is still having a problem:
> Hi Bruno and Chiara,
>
> Here is a small script testing my concern:
>
> from yade import pack
>
> def numInteract():
>   print O.interactions.countReal()
>
>
> O.materials.append(FrictMat(young=150e6,poisson=.3,frictionAngle=.4,density=2600))
> O.bodies.append(
>   [utils.sphere(center=[0,0,0],radius=0.5),
>   utils.sphere(center=[1,0,0],radius=0.5),
>   utils.sphere(center=[0,1,0],radius=0.5),
>   utils.sphere(center=[1,1,0],radius=0.5),
>   utils.sphere(center=[0,0,1],radius=0.5),
>   utils.sphere(center=[1,0,1],radius=0.5),
>   utils.sphere(center=[0,1,1],radius=0.5),
>   utils.sphere(center=[1,1,1],radius=0.5)]
> )
> walls = utils.aabbWalls(thickness=0.1)
> O.bodies.append(walls)
>
> O.dt=.5*utils.PWaveTimeStep()
> O.engines=[
>   ForceResetter(),
>
> InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()],sweepLength=.025),
>   InteractionLoop(
>      [Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
>      [Ip2_FrictMat_FrictMat_FrictPhys()],
>      [Law2_ScGeom_FrictPhys_CundallStrack()]
>   ),
>   NewtonIntegrator(),
>   TriaxialCompressionEngine(
>      internalCompaction=False,
>      sigmaIsoCompaction=100e3,
>      max_vel=10
>   ),
>   PyRunner(command='numInteract()',iterPeriod=10)
> ]
> O.run(100); O.wait()
>
> For this special lattice (regularly aligned eight particles), the number
> of particle-particle contacts is 12 and the particle-wall contacts is 8.
> So I suppose the coordination number is (12x2+8)/8=4 because we can see
> there are exactly 4 contacts for each particle. This means each p-p
> contact should be counted twice while each p-w contact once. I'm
> confused why the countReal() gives me a value of 9 and
> avgNumInteractions() gives me 1.2857 in the test?
>
> I'm sorry I'm new to YADE and may code the script wrongly. Sorry for the
> trouble.
>
> Best regards!
> Ning
>
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