[gmx-users] water-air interface surface tension

[gromacs]

Hi, experts,
 
I'd like to calculate the surface tension at water-air interface using Gromacs.
which ensemble should i choose?
 when i run simulation, .mdp how can i select p-coupling?
 
whether should i use p-coupling?
 
I can creat a air-water-air structure (.gro)
 
Thanks?
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