Yade

facetCylinder disintegrates when being rotated

Asked by Steve

Hi,

I am trying to apply rotation to a facetCylinder with rotationEngine. However, when rotation is applied, the cylinder starts behaving weirdly and the lines start to separate into two groups. Is this because facetCylinders are not meant to be rotated?

Thanks,
Steve

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Jan Stránský
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Best Jan Stránský (honzik) said : 		#1

Hi Steve,
please, if possible, always provide a MWE [1]. We could e.g. immediately if rotateAroundZero [2] is missing or not

###
ids=O.bodies.append(geom.facetCylinder((0,0,0),1,2))
O.engines = [
   ForceResetter(),
   RotationEngine(ids=ids,angularVelocity=1,rotateAroundZero=True),
   NewtonIntegrator(),
]
O.dt = 1e-6
###

cheers
Jan

[1] https://yade-dem.org/wiki/Howtoask
[2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.RotationEngine

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Steve (oneinchofgrey) said : 		#2

Hi Jan,

Thanks for the answer and it worked. I will also make sure to provide MWEs in the future.

Another question though, is that how would I rotate the cylinder about its centroid without having to change the zeroPoint? According to the reference manual, if rotateAroundZero=false, then the cylinder will automatically rotate around its centroid.

Thanks again,
Steve

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Steve (oneinchofgrey) said : 		#3

Thanks Jan Stránský, that solved my question.

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Jan Stránský (honzik) said : 		#4

Hi Steve

> According to the reference manual, if rotateAroundZero=false, then the cylinder will automatically rotate around its centroid.

no, the manual says "bodies will not rotate around their centroids", meaning each single body (each facet) will rotate around its centroid. This results in the "separation".

cheers
Jan