Page Menu
Home
c4science
Search
Configure Global Search
Log In
Files
F93651148
fix_drag.html
No One
Temporary
Actions
Download File
Edit File
Delete File
View Transforms
Subscribe
Mute Notifications
Award Token
Subscribers
None
File Metadata
Details
File Info
Storage
Attached
Created
Sat, Nov 30, 11:01
Size
2 KB
Mime Type
text/html
Expires
Mon, Dec 2, 11:01 (2 d)
Engine
blob
Format
Raw Data
Handle
22669332
Attached To
rLAMMPS lammps
fix_drag.html
View Options
<HTML>
<CENTER><A
HREF =
"http://lammps.sandia.gov"
>
LAMMPS WWW Site
</A>
-
<A
HREF =
"Manual.html"
>
LAMMPS Documentation
</A>
-
<A
HREF =
"Section_commands.html#comm"
>
LAMMPS Commands
</A>
</CENTER>
<HR>
<H3>
fix drag command
</H3>
<P><B>
Syntax:
</B>
</P>
<PRE>
fix ID group-ID drag x y z fmag delta
</PRE>
<UL><LI>
ID, group-ID are documented in
<A
HREF =
"fix.html"
>
fix
</A>
command
<LI>
drag = style name of this fix command
<LI>
x,y,z = coord to drag atoms towards
<LI>
fmag = magnitude of force to apply to each atom (force units)
<LI>
delta = cutoff distance inside of which force is not applied (distance units)
</UL>
<P><B>
Examples:
</B>
</P>
<PRE>
fix center small-molecule drag 0.0 10.0 0.0 5.0 2.0
</PRE>
<P><B>
Description:
</B>
</P>
<P>
Apply a force to each atom in a group to drag it towards the point
(x,y,z). The magnitude of the force is specified by fmag. If an atom
is closer than a distance delta to the point, then the force is not
applied.
</P>
<P>
Any of the x,y,z values can be specified as NULL which means do not
include that dimension in the distance calculation or force
application.
</P>
<P>
This command can be used to steer one or more atoms to a new location
in the simulation.
</P>
<P><B>
Restart, fix_modify, output, run start/stop, minimize info:
</B>
</P>
<P>
No information about this fix is written to
<A
HREF =
"restart.html"
>
binary restart
files
</A>
. None of the
<A
HREF =
"fix_modify.html"
>
fix_modify
</A>
options
are relevant to this fix.
</P>
<P>
This fix computes a global 3-vector of forces, which can be accessed
by various
<A
HREF =
"Section_howto.html#howto_15"
>
output commands
</A>
. This is the
total force on the group of atoms by the drag force. The vector
values calculated by this fix are "extensive".
</P>
<P>
No parameter of this fix can be used with the
<I>
start/stop
</I>
keywords of
the
<A
HREF =
"run.html"
>
run
</A>
command. This fix is not invoked during
<A
HREF =
"minimize.html"
>
energy
minimization
</A>
.
</P>
<P><B>
Restrictions:
</B>
none
</P>
<P><B>
Related commands:
</B>
</P>
<P><A
HREF =
"fix_spring.html"
>
fix spring
</A>
,
<A
HREF =
"fix_spring_self.html"
>
fix spring/self
</A>
,
<A
HREF =
"fix_spring_rg.html"
>
fix spring/rg
</A>
,
<A
HREF =
"fix_smd.html"
>
fix smd
</A>
</P>
<P><B>
Default:
</B>
none
</P>
</HTML>
Event Timeline
Log In to Comment