yade-users team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Hello all,

There is few modifications to be made in the equations of damping (force 
and momentum).
The current equations are of the type : for i=1,...,3 { f[i] *= 1- 
damping * sign(f[i]*vel[i]); }

in fact it should be : f *= 1- damping * sign(f.vel);  (where *= denotes 
product between vector and real and "." is the scalar product of two 
vectors).

It can make a difference in some cases.

If everybody agree, I'll try to correct this and commit the change to 
the SVN repository. In the meantime I suggest that everybody doing 
calculation with Yade change the corresponding lines in force and 
momentum damping engines. (Luc : does this little sphere roll to the 
bottom of the big sphere with these new equations?)

Bruno
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