[gmx-users] Constant Volume Simulation.

[Mark Abraham]

> Dear users, How can I do a constant volume simulation in Gromacs? By
> removing Pressure coupling, it is constant pressure.

No. Constant pressure is a bit of a misnomer - the algorithms used to
achieve "constant pressure" simulations use feedback mechanisms to keep
the pressure close to constant. Ditto temperature.

> By removing both
> Pressure and Temp coupling, it will be constant energy simulation.

Yes, but it is also constant volume, since in general you must do work to
change the volume of a system.

Mark