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[Robert Caulk <question671372@xxxxxxxxxxxxxxxxxxxxx>]

Question #671372 on Yade changed:
https://answers.launchpad.net/yade/+question/671372

    Status: Open => Answered

Robert Caulk proposed the following answer:
Hello,

I guess this is mostly a paraview question:

"I am not able to set the conditions in paraview such that I can get a
variation of velocities of sphere during collapsing of the slope."

As I read it, you would like to plot the particle velocities during the
slope collapse? Velocities are easily plotted in paraview, so I get the
feeling this might be a VTK iterperiod problem, but tough to speculate
any further without more information from you. Can you describe exactly
what you are seeing in paraview in addition to exactly what you expect
to see?

Regarding the statement: "!joint cohesion total degradation! |
iteration= 2000"

This is simply a statement that you are printing in your script when the
iteration number exceeds a predefined number of iterations and a
reference point Y abs(velocity) exceeds (in a Y direction sense) some
predefined Y velocity:

if degrade and O.iter>=stableIter and abs(O.bodies[refPoint].state.vel[1])<stableVel :
    print '!joint cohesion total degradation!', ' | iteration=', O.iter

which appears to be followed by an explicit command to remove all joint
interaction cohesion and strength:

	for i in O.interactions:
	    if i.phys.isOnJoint : 
		if i.phys.isCohesive:
		  i.phys.isCohesive=False
		  i.phys.FnMax=0.
		  i.phys.FsMax=0.

So in other words, as soon as your predefined iteration threshold and
velocity value at your reference point are met, your script
automatically removes joint cohesion and strength.

Cheers,

Robert

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