yade-dev team mailing list archive

[Jan Stránský <honzik.stransky@xxxxxxxxx>]

Hi Bruno,


> This engine has been introduced before effective integration of python.
> Is it doing something that can't be done with python?
>

despite this fact, you can just use one line in your python script in
O.engines instead of defining your own function and call it in PyRuuner..
It is true that (according to this thread), it is not maintained for some
time (e.g. directly prescribing displacements), but the functionality is in
general useful..


>
> Your case with this bug was typical. You could:
> 1/ type a few python lines to do exactly what you want, or
> 2/ learn how to use an engine, try it, realize that it is not doing what
> you think it would do, find a bug, report, get feedback, start fixing
> Coming soon: commit, push, get feedback again, etc.
>
> If this engine is removed you will:
> 1/ type a few python lines to do exactly what you want
> Less compilation time for us all, less maintainance, less noise on the
> mailing list.
>

correct, but as more than one person may use it (me for example :-), it
does not matter if it is written in c++ or rewritten to python (somebody
would maintain it, test it, ask questions on mailing lists...)

cheers
Jan

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https://bugs.launchpad.net/bugs/1300167

Title:
  (Not) Defining velocities in UniaxialStrainer ?

Status in Yet Another Dynamic Engine:
  New

Bug description:
  Hi,

  I have the feeling that there is something "wrong" with
  UniaxialStrainer where the velocities of the "posIds" and "negIds"
  bodies are not defined, and I illustrate it with following examples
  (attached)

  It deals with 2 contacting spheres, with an oblic contact. One sphere is moved towards the 2d sphere, and here both normal and tangential relative displacements occur. 
  - In testUS.py the moving sphere is moved through UniaxialStrainer
  - Whereas in testUSb.py the movement comes from an initial value of velocity (and NewtonIntegrator)

  And, obviously, the two simulations are different (see e.g. the plot
  of fZ sustained by moving sphere). While I would tend to consider
  these two simulations as identical.

  What do you think ?

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