What is the different between "periodic boundary ,spherical harmonic boundary and cylindrical harmonic boundary conditions"?

From: Aurum Bai (javacfish_at_yahoo.com.cn)
Date: Fri Aug 07 2009 - 11:04:50 CDT

Hello, everyone

I found there are "periodic boundary","spherical harmonic boundary" and "cylindrical harmonic boundary conditions" in namd simulation.

But I do not what are they different?

Who can tell me what are the different between them, or how to choose them in some conditions?



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