Question #692956 on Yade changed:
https://answers.launchpad.net/yade/+question/692956
Status: Needs information => Open
Rohit John gave more information on the question:
Hello,
Thanks for your answers
reply to Robert's comments.
> Even if what you say is true (which seems odd to me), why should that prevent
> you from using CentralGravityEngine? There are plenty of ways to "see" motion
> without physically observing it in a window.
I want to observe the interaction between the debris and the cylinders.
Viewing the motion, compared to tracking states of the bodies, will
offer additional insights into the dynamics. I will read the document
Janek suggested [1].
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>You can change/turn off the applied force at any time step you like.
>From what I understood, the forceEngine applies the same force to all
bodies in the simulation. I would like to have a force which depends on
the position of the bodies. The equations are given here [2].
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> I don't think FieldApplier should be used directly. But I really don't know
> why you believe it looks promising. Please provide links to everything you
> reference. What are you reading? Where are you reading it?
I read the YADE documentation about fieldApplier [3]. I understood that the
gravity fields use FieldApplier. Since there are engines for creating forces
directed to an axis(AxialGravityEngine) or a body (CentralGravityEngine), I
assumed that the forces are dependent on the position of the body they act on.
I do not know how exactly the engine works. I then assumed it would be possible
to create a function capable of exerting a position dependent force on a body
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reply to Janek's comments
> CentralGravityEngine does not depend on distance
That's too bad. I thought it used Newton's gravitational law. If this is the
case, I cannot use it.
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I do not know how to code a new engine or use c++. Please correct me if I am
wrong. Can I add a new function for defining a the forces using the equations
from [2] in the GravityEngines.cpp [4], based on the other functions in the
file? Are there other files I must modify in addition to this?
Kind regards,
Rohit John
[1] https://yade-dem.org/doc/yade.qt.html#yade.qt._GLViewer.center
[2] https://en.wikipedia.org/wiki/Clohessy%E2%80%93Wiltshire_equations
[3] https://yade-dem.org/doc/yade.wrapper.html#fieldapplier
[4]
https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/common/GravityEngines.cpp#L51
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