<TR><TD ><I>peri</I> </TD><TD > density, volume </TD><TD > mesocopic Peridynamic models 

</TD></TR></TABLE></DIV>

<P>All of the styles define point particles, except the <I>ellipsoid</I> and

<I>granular</I> and <I>peri</I> styles.  These define finite-size particles.

For <I>ellipsoidal</I> systems, the <A HREF = "shape.html">shape</A> command is used to

specify the size and shape of particles, which can be spherical or

aspherical.  For <I>granular</I> systems, the particles are spherical and

each has a specified diameter.  For <I>peri</I> systems, the particles are

spherical and each has a specified volume.

</P>

<P>All of the styles assign mass to particles on a per-type basis, using

the <A HREF = "mass.html">mass</A> command, except the <I>granular</I> and <I>peri</I> styles.

For <I>granular</I> systems, the specified diameter and density are used to

calculate each particle's mass.  For <I>peri</I> systems, the speficied

volume and density are used to calculate each particle's mass.

</P>

<P>Only the <I>dpd</I> and <I>granular</I> styles communicate velocities with ghost

atoms; the others do not.  This is because the pairwise interactions

calculated by the <A HREF = "pair_dpd.html">pair_style dpd</A> and <A HREF = "pair_gran.html">pair_style

granular</A> commands require velocities.

</P>

<HR>

<P>Typically, simulations require only a single (non-hybrid) atom style.

If some atoms in the simulation do not have all the properties defined

by a particular style, use the simplest style that defines all the

If some atoms have bonds, but others do not, use the <I>bond</I> style.

</P>

<P>The only scenario where the <I>hybrid</I> style is needed is if there is no

single style which defines all needed properties of all atoms.

E.g. if you want charged DPD particles, you would need to use

single style which defines all needed properties of all atoms.  For

example, if you want charged DPD particles, you would need to use

"atom_style hybrid dpd charge".  When a hybrid style is used, atoms

store and communicate the union of all quantities implied by the

individual styles.

{molecular} | bonds, angles, dihedrals, impropers | uncharged molecules |

{peri} | density, volume | mesocopic Peridynamic models :tb(c=3,s=|)

All of the styles define point particles, except the {ellipsoid} and

{granular} and {peri} styles.  These define finite-size particles.

For {ellipsoidal} systems, the "shape"_shape.html command is used to

specify the size and shape of particles, which can be spherical or

aspherical.  For {granular} systems, the particles are spherical and

each has a specified diameter.  For {peri} systems, the particles are

spherical and each has a specified volume.

All of the styles assign mass to particles on a per-type basis, using

the "mass"_mass.html command, except the {granular} and {peri} styles.

For {granular} systems, the specified diameter and density are used to

calculate each particle's mass.  For {peri} systems, the speficied

volume and density are used to calculate each particle's mass.

Only the {dpd} and {granular} styles communicate velocities with ghost

atoms; the others do not.  This is because the pairwise interactions

calculated by the "pair_style dpd"_pair_dpd.html and "pair_style

granular"_pair_gran.html commands require velocities.

:line

Typically, simulations require only a single (non-hybrid) atom style.

If some atoms in the simulation do not have all the properties defined

by a particular style, use the simplest style that defines all the

If some atoms have bonds, but others do not, use the {bond} style.

The only scenario where the {hybrid} style is needed is if there is no

single style which defines all needed properties of all atoms.

E.g. if you want charged DPD particles, you would need to use

single style which defines all needed properties of all atoms.  For

example, if you want charged DPD particles, you would need to use

"atom_style hybrid dpd charge".  When a hybrid style is used, atoms

store and communicate the union of all quantities implied by the

individual styles.