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Sun, Jul 20, 19:32
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Tue, Jul 22, 19:32 (1 d, 23 h)
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rLAMMPS lammps
create_atoms.html
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<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>
create_atoms command
</H3>
<P><B>
Syntax:
</B>
</P>
<PRE>
create_atoms type region-ID
</PRE>
<UL><LI>
type = atom type (1-N) of atoms to create on a lattice
<LI>
region-ID = ID of region each atom will belong to (optional)
</UL>
<P><B>
Examples:
</B>
</P>
<PRE>
create_atoms 1 regsphere
create_atoms 3
</PRE>
<P><B>
Description:
</B>
</P>
<P>
This command creates atoms on a lattice as an alternative to reading
in their coordinates via a
<A
HREF =
"read_data.html"
>
read_data
</A>
or
<A
HREF =
"read_restart.html"
>
read_restart
</A>
command. A simulation box must
already exist, which is created with the
<A
HREF =
"create_box.html"
>
create_box
</A>
command.
</P>
<P>
Before using this command, a lattice must be defined using the
<A
HREF =
"lattice.html"
>
lattice
</A>
command. If a region is not specified, the
create_atoms command fills the entire simulation box with atoms on the
lattice. If a region is specified, then the geometric volume is
filled that is inside the simulation box and is also consistent with
the region volume.
</P>
<P>
The
<I>
create_atoms
</I>
command can be used multiple times with different
lattice orientations to create grain boundaries. Used in conjunction
with the
<A
HREF =
"delete_atoms.html"
>
delete_atoms
</A>
command, reasonably complex
geometries can be created. The
<I>
create_atoms
</I>
command can also be
used to add atoms to a system previously read in from a data or
restart file. In all these cases, care should be taken to insure that
new atoms do not overlap existing atoms inappropriately.
</P>
<P>
Created atoms are assigned the specified atom type and a velocity of
0.0.
</P>
<P><B>
Restrictions:
</B>
</P>
<P>
An
<A
HREF =
"atom_style.html"
>
atom_style
</A>
and
<A
HREF =
"lattice.html"
>
lattice
</A>
must be
previously defined to use this command.
</P>
<P><B>
Related commands:
</B>
</P>
<P><A
HREF =
"lattice.html"
>
lattice
</A>
,
<A
HREF =
"orient.html"
>
orient
</A>
,
<A
HREF =
"origin.html"
>
origin
</A>
,
<A
HREF =
"region.html"
>
region
</A>
,
<A
HREF =
"create_box.html"
>
create_box
</A>
,
<A
HREF =
"read_data.html"
>
read_data
</A>
,
<A
HREF =
"read_restart.html"
>
read_restart
</A>
</P>
<P><B>
Default:
</B>
none
</P>
</HTML>
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