a) the velocity command simply sets
initial velocities before or between runs.
It has nothing to do with nve or langevin
which operate during a simulation run.
b) Aidan will have to answer this. I don't
know if it is possible or makes sense to
turn off 3-body interactions for a SW model.
Steve
2010/12/30 XiaoJing <[email protected]...>:
It is certainly possible to turn off the threebody interaction for certain
elements by setting lambda to zero. LAMMPS only requires that it be
non-negative. Similarly, you can trun off the twobody interaction by setting
A to zero. If you set all the parameters to zero, you may get floating-point
exceptios, so you should choose dummy values for those.
Aidan