yade-users team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Thanks. Everything is as expected then, always good to hear.
For motion engines, I prefer not to use them as we can simply assign 
velocity directly. Soon, you will not have to modify anything in Newton, 
since this behaviour of non-dynamic bodies is currently being implemented.
Test scripts without Newton is not a good thing IMHO, you are putting 
yourself in a special case wich will never happen in routine 
simulations. It can hide existing problems or create problems that would 
not exist with Newton.

Bruno


chiara modenese a écrit :
>         If you still want to compare ratcheting in
>         Law2_ScGeom_FrictPhys_Basic, a quick hack is to change
>         "true"->"false" at line ElasticContactLaw.cpp:77
>         Please tell me the result. :)
>
>
> Hi Bruno,
>
> I revised a little bit the script (I attached it again) I sent you 
> concerning RotationEngine (which applies the rolling) and now it works 
> well. I preferred to maintain the use of Rotation and StepDisplacer 
> engines, I did not have time to modify NewtonIntegrator and anyway 
> both solutions should work.
>
> I tested it using Law2_ScGeom_FrictPhys_Basic. Avoiding granular 
> ratcheting (which is the default-fixed option in the code atm) no 
> shear force is present at the end of the loop (just run the script as 
> it is). Instead, I tried the case in which we want to consider 
> granular ratcheting (changing directly the code as you suggest above) 
> and a net shear force remains at the end (in the case I was running, I 
> have got a value of 0.183), although the ball comes back exactly at 
> the same initial position. Meanwhile, I have also printed out the 
> values of the branches applied to the rotations in ScGeom, and yes 
> they differ, in the case with ratcheting, between the first and second 
> rotation. They are exactly the same avoiding ratcheting. Maybe I try 
> also with other contact laws and I let you know.
>
> Chiara
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--
_______________
Bruno Chareyre
Associate Professor
Grenoble INP
Lab. 3SR
BP 53 - 38041, Grenoble cedex 9 - France
Tél : 33 4 56 52 86 21
Fax : 33 4 76 82 70 43
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