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aabbDim() and Triax.box volume difference ?

Asked by ahmad mostafa

Hello,

I have a question concerning the packing total volume which can be calculated by many methods depending on the engines you are using :
1-aabbDim()[0]*aabbDim()[1]*aabbDim()[2]
2-triax.boxvolume

the first one is calculated due to wall position and the second is found on the triaxstresscontroller ?
To be consistent these two values should be equal but unfortunately they are not ?

Can anybody help please to explain to me why they are not equal ?

Cheers,
Ahmad

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Karol Brzezinski
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Best Karol Brzezinski (kbrzezinski) said : 		#1

Hi Ahmad,

could you provide the MWE (Minimum Working Example)[1] that shows the difference that you are talking about?

1 - aabbDim() computes dimensions of a minimum axis aligned bounding box containing all the spheres from the simulation.
2 - triax.boxvolume probably computes volume from periodic cell dimensions.

There are multiple reasons to get different results (e.g using non-spherical particles in the simulation, the cell is not fully filled with spheres, particles are 'outside' the cell, etc.).

Cheers,
Karol

[1] https://www.yade-dem.org/wiki/Howtoask

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ahmad mostafa (ahmadmo) said : 		#2

Thanks Karol Brzezinski, that solved my question.