[gmx-users] How to define Center of Mass velocity of a specific group

[Tomy van Batis]

Dear all

I have a system consisting of 2 substrates (20 nm distance between them) and
inside them there are polymer chains. I would like during my NVT simulations
the substrates NOT to move (I suppose I have to put  the velocity of the COM
of it's substrate to be zero).

Does anyone know how to do that?

Thanks in advance
Chrysostomos
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