[Pw_forum] constrained dynamics

[Paolo Giannozzi]

On Apr 6, 2011, at 22:01 , hanghui chen wrote:

> I want to run constrained dynamics to relax the atoms.
> However, it seems that if I use 'ion_dynamics = bfgs',
> the SHAKE algorithm does not work. Is this true that the
> SHAKE algorithm is not implemented I use 'bfgs' method
> to relax the atoms?

it is. bfgs is not a "dynamics", anyway: it is an optimization
scheme. You can use SHAKE only in conjunction with
'verlet' dynamics, I think (no warranty)

P.
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Paolo Giannozzi, Dept of Chemistry&Physics&Environment,
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy
Phone +39-0432-558216, fax +39-0432-558222