pressure control in config file

From: xiaojing gong (gongxiaojing1981_at_yahoo.com.cn)
Date: Sun Jul 17 2005 - 20:06:16 CDT

Hi,
   I have learned the tutorial about Simulation of Water Permeation through Nanotubes , I don't know why there is no pressure control in the sample config file? and when I add the pressure control
useGroupPressure yes
useFlexibleCell no
LangevinPiston on
LangevinPistonTarget 1
LangevinPistonPeriod 200
LangevinPistonDecay 500
LangevinPistonTemp 310
 the volumn of the system will become larger. I don't know why.
gong xiaojing

                
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