is multiple timesteps possible in lammps?

Dear all:
I read a paper about simulation with water, and it use different timestep for water and substrate, I don’t know whether lammps can also do that?
best regards,
Chen Yunhui

Dear all:
     I read a paper about simulation with water, and it use different
timestep for water and substrate, I don't know whether lammps can also do
that?

no. and this seems odd and likely is not using a well
defined set of equations of motion. unless the substrate
is huge, there is not much of a benefit, particularly in
parallel runs. LAMMPS has r-RESPA multi-time stepping.
check out the documentation.

axel.

in addition, if the intent is to avoid force computations
for something that is kept immobile, LAMMPS has a
better option by allowing to remove interactions from
the neighborlist completely.

axel.