It seems not working...
Basically I want to apply a constant force after a certain number of
iterations. So I do:
In the list of engines:
PeriodicPythonRunner(iterPeriod=1,command='shearForce()')
I define the function as:
def shearForce():
if (O.iter>300):
i=O.interactions[0,1]
ForceEngine(force=(0,1e5,0),subscribedBodies=[0])
plot.addData(fs=i.phys.shearForce[1],it=O.iter)
But it does not apply such force (I have checked through the plot).
Any suggestions? Is it right to go on in this way?
Thanks, Chiara
On 19 March 2010 14:35, Benoit Charlas <benoit.charlas@xxxxxxxxxxx
<mailto:benoit.charlas@xxxxxxxxxxx>> wrote:
Hi
Did you manage to understand?
Benoit
chiara modenese a écrit :
Hi! Thanks for your answer. I have tried to include the
ForceEngine as
ForceEngine(force=(100000000,0,0))
in the list of the engines (so at the moment it is just a simple
case, not using PyRunner) but I do not see any force applied to
my bodies... If I use ForceEngine should I also specify the id of
the body/ies I want to apply the force on?
I am still learning..;)
Cheers, Chiara
2010/3/19 Benoit Charlas <benoit.charlas@xxxxxxxxxxx
<mailto:benoit.charlas@xxxxxxxxxxx>>
Hi Chiara
I don't really understand your question. What I don't
understand the most is do you want to apply this force once
(for tot iteration) or every x TimeStep.
But i'll try to answer with my very little knowledge!
The function PeriodicPythonRunner allows you to apply an
action (for example a Python function) periodically every :
virtPeriod, realPeriod or iterPeriod
For example let's write that you want to apply your force
every 1000 iteration steps
forceengine=ForceEngine(/.../)
PeriodicPythonRunner(iterPeriod=1000,command='forceengine()')
But then you'll apply the same force every 1000 steps.
You can also apply an evolution to your force or anything you
want while defining another function
Let's call your function "applyAForce()" and let's suppose
you want to increment 10 times your force
O.engines=[
...
PeriodicPythonRunner(iterPeriod=1000,command='applyAForce()')
]
...
def applyAForce():
/your function with (nearly) everything you want like
ForceEngine(...)/
You should check in the directory yade/examples. There are
some useful tips in those examples !
Cheers,
Benoit
Václav Šmilauer a écrit :
is it possible to call an engine inside another engine in python? For
instance, can I use PeriodicPythonRunner to define a function that
having
satisfied a certain condition (say after tot iterations) call an engine
(say
apply a force)?
Hi Chiara, engines are callable objects (define the __call__ method), so
you can call them with ():
forceEngine=ForceEngine(...)
forceEngine()
# ForceEngine(...)() would also work
You can make the forceEngine a variable so that the engine is not
constructed every time.
Cheers, Vaclav
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