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[amir <question660590@xxxxxxxxxxxxxxxxxxxxx>]

Question #660590 on Yade changed:
https://answers.launchpad.net/yade/+question/660590

    Status: Answered => Open

amir is still having a problem:
Hi Jérôme,

Does your question now concern whether it is possible to get back the exact same state of your model between
- the end of a 1st simulation
- the start of a 2d simulation = the end of the 1st simulation + deleting + re-inserting a body, hoping to reinstall the same conditions than the end of the 1st simulation
?

Exactement! That's right. This is what I really want to do. Is it
possible?

- in the 2d simulation you're doing one more iteration. I think you
should thus compare the 1st iteration of the 2d simulation with
iteration 101 of the 1st simulation, and not iteration 100

In the 1st simulation the body force does not change after 63 iteration.
Take a look at the "comparison.odt" in the google drive link posted in
previous msg. So, in the 2nd simulation the body force must be the same
value.

- did you try other damping values (0.05 instead of 0.7 for instance) ?
Just an idea to check whether this affects the behavior you observe

By changing damping to 0.125 in the 2nd simulation, I have reached
almost the same body force at the end of the 1st simulation:

Yade [1]: iter : 1
positions : 0.499999741063
velocity : 0.0627121498083
force : Vector3(0,0,13618.636139212844)
normalForce : Vector3(0,0,3404.659034803211)
normalForce : Vector3(0,0,3404.659034803211)
normalForce : Vector3(0,0,3404.659034803211)
normalForce : Vector3(0,0,3404.659034803211)
iter : 2
positions : 0.499720937866
velocity : -0.0342534885211
force : Vector3(0,0,6.904993545830962)
normalForce : Vector3(0,0,1.7262483864577405)
normalForce : Vector3(0,0,1.7262483864577405)
normalForce : Vector3(0,0,1.7262483864577405)
normalForce : Vector3(0,0,1.7262483864577405)

When I used damping 0.7 for the 2nd simulation (same as the 1st
simulation), only the 1st iteration gives unrealistic results! From then
on, the results are correct.

Moreover, in the 1st simulation there two normalForce (sphere+facet).
Why are there four normalForce for the 2nd simulation?

Thanks

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