wangcl wrote:
Hi,

In manual gmx 3.3, I find “if possible, the total charge of a charge group should be zero” .

In my systems, I want to do an artificial charge distribution model. So I have some questions:

1. I don’t know whether it is right that I don’t make the total charge to zero in one charge group.

See GROMACS manual section 3.4.2.

2. Take an example, I add charge on a single wall nanotube. How do I define charge group? 1 or 2 or 3 in a group?

I don't understand you.

Mark
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