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[ESPResSo] how to specify normal wall?

From: Salvador Herrera Velarde
Subject: [ESPResSo] how to specify normal wall?
Date: Wed, 17 Jun 2009 18:25:11 -0400

Dear All,

I am trying to to implement the wall normal constraints in one of my scripts,  however I run into some troubles.

What I did was:
# Particle potential ( type 0 )
inter coulomb $lb dh $dk $rc

set dc1 [expr {0.8* $bl } ]
constraint wall normal 0 0 -1 dist $dc1 type 1

set dc2 [expr {0.2* $bl } ]
constraint wall normal 0 0 1 dist $dc2 type 2

inter 0 1 wall normal
inter 0 2 wall normal

It is supposed that I have the constraints feature activated, but the result is:

excessive parameter/unknown interaction type "wall" in parsing non bonded interaction
    while executing
"inter 0 1 wall normal "

Could you help me to handle this?

thanks a lot for your time,


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