Yade

How to fix clumps in a direction for 2D simulation

Asked by Henry

I'm using Yade to simulate a direct shear test in 2D. And I used PFC2D generate some clumps and import to Yade.
I use the following code to fix the clumps in "Y" direction (the sample is on the xz plane and y=0):

if isinstance(b.shape,Clump): b.state.blockedDOFs='yXZ'

or
if isinstance(b.shape,Clump): b.state.blockedDOFs='yXZ'

However the clumps is rotating and moving in Y direction. anyon can help me?
thanks !

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Bruno Chareyre (bruno-chareyre) said : 		#1

Did you turn z-velocity=0 after setting blockedDOFs="yXZ"?
Else the bodies would move at constant velocity (the velocity they have before you block them).

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Henry (wenjiexu) said : 		#2

Thanks Chareyre.

I set the blockedDOFs="yXZ" at the initial step.

But when I set the .blockedDOFs='yXYZ' for Clumps, the clump is ok in 2D:
if isinstance(b.shape,Clump): b.state.blockedDOFs='yXYZ'

should I set blockedDOFs='yXYZ' for clumps in 2D?
Thanks!

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Bruno Chareyre (bruno-chareyre) said : 		#3

I think I get it: aspherical rotation algorithm does not support partial blocking. Try setting exactAsphericalRot=0 in Newton, and see if it's better with blockedDOFs="yXZ".

And no, you should not block "Y" in 2D.

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