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[Jan Stránský <question660155@xxxxxxxxxxxxxxxxxxxxx>]

Question #660155 on Yade changed:
https://answers.launchpad.net/yade/+question/660155

    Status: Needs information => Answered

Jan Stránský proposed the following answer:
Hi Rodolfo,
thanks for more detailed info.
I am sorry, in the code I totally missed the DragEngine, it is very important related to your question, next time please emphasize it :-)
In this case, you are right: the current implementation [1] only considers individual spheres, not clumps.

> I believe that Yade is not calculating the projection area of the
whole clump, but of only one sphere.

yes :-)

> Is it possible to make the Yade calculate velocities considering the different potions of the falling particle?
> Is there a way to simulate the drag force at the clump level, and not just for the spheres as if they were not part of a clump?

not with current implementation of DragEngine. But I think it would not
be difficult to write your own DragEngine for clumps in Python, we can
help you start if you want. So yes, it is possible :-)

cheers
Jan

[1]
https://github.com/yade/trunk/blob/master/pkg/common/ForceEngine.cpp#L45

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