Pan Wu wrote:
Hello everyone,
    Is there any advantage of using NPT ensemble over NVT?

Sure. Most experimental data is measured from NPT. If using REMD, you avoid non-physical pressures at high temperature.

Seems people doing simulation with gromacs like to use NPT (for protein + solvent system). However, for NPT, there is one parameter "compressibility" which is tricky to choose;

I don't think it is intrinsically tricky. See discussion in manual section 3.4.6.

Mark
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