git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@2790 f3b2605a-c512-4ea7-a41b-209d697bcdaa
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@ -68,7 +68,8 @@ command for a discussion of the geometry of tilted boxes in LAMMPS.
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are both in the compute group and in the same spatial bin is summed to
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are both in the compute group and in the same spatial bin is summed to
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compute an average velocity for the bin. This bias velocity is then
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compute an average velocity for the bin. This bias velocity is then
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subtracted from the velocities of individual atoms in the bin to yield
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subtracted from the velocities of individual atoms in the bin to yield
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a thermal velocity.
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a thermal velocity for each atom. Note that if there is only one
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atom in the bin, it's thermal velocity will thus be 0.0.
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</P>
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</P>
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<P>After the spatially-averaged velocity field has been subtracted from
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<P>After the spatially-averaged velocity field has been subtracted from
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each atom, the temperature is calculated by the formula KE = dim/2 N k
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each atom, the temperature is calculated by the formula KE = dim/2 N k
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@ -106,8 +107,8 @@ needed, the subtracted degrees-of-freedom can be altered using the
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<P>See <A HREF = "Section_howto.html#4_16">this howto section</A> of the manual for a
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<P>See <A HREF = "Section_howto.html#4_16">this howto section</A> of the manual for a
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discussion of different ways to compute temperature and perform
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discussion of different ways to compute temperature and perform
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thermostatting. Using this compute in conjunction with a
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thermostatting. Using this compute in conjunction with a
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thermostatting fix will effectively implement a PUT, as described in
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thermostatting fix, as explained there, will effectively implement a
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<A HREF = "#Evans">(Evans)</A>.
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profile-unbiased thermostat (PUT), as described in <A HREF = "#Evans">(Evans)</A>.
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</P>
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</P>
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<P><B>Output info:</B>
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<P><B>Output info:</B>
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</P>
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</P>
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@ -60,7 +60,8 @@ When a temperature is computed, the velocity for the set of atoms that
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are both in the compute group and in the same spatial bin is summed to
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are both in the compute group and in the same spatial bin is summed to
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compute an average velocity for the bin. This bias velocity is then
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compute an average velocity for the bin. This bias velocity is then
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subtracted from the velocities of individual atoms in the bin to yield
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subtracted from the velocities of individual atoms in the bin to yield
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a thermal velocity.
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a thermal velocity for each atom. Note that if there is only one
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atom in the bin, it's thermal velocity will thus be 0.0.
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After the spatially-averaged velocity field has been subtracted from
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After the spatially-averaged velocity field has been subtracted from
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each atom, the temperature is calculated by the formula KE = dim/2 N k
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each atom, the temperature is calculated by the formula KE = dim/2 N k
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@ -98,8 +99,8 @@ needed, the subtracted degrees-of-freedom can be altered using the
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See "this howto section"_Section_howto.html#4_16 of the manual for a
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See "this howto section"_Section_howto.html#4_16 of the manual for a
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discussion of different ways to compute temperature and perform
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discussion of different ways to compute temperature and perform
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thermostatting. Using this compute in conjunction with a
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thermostatting. Using this compute in conjunction with a
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thermostatting fix will effectively implement a PUT, as described in
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thermostatting fix, as explained there, will effectively implement a
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"(Evans)"_#Evans.
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profile-unbiased thermostat (PUT), as described in "(Evans)"_#Evans.
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[Output info:]
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[Output info:]
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@ -133,6 +133,17 @@ could potentially overflow the list. This threshold is set by the
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<I>one</I> value which tells LAMMPS the maximum number of neighbor's one
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<I>one</I> value which tells LAMMPS the maximum number of neighbor's one
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atom can have.
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atom can have.
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</P>
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</P>
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<P>IMPORTANT NOTE: LAMMPS can crash without an error message if the
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number of neighbors for a single particle is larger than the <I>page</I>
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setting, which means it is much, much larger than the <I>one</I> setting.
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This is because LAMMPS doesn't error check these limits for every
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pairwise interaction (too costly), but only after all the particle's
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neighbors have been found. This problem usually means something is
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very wrong with the way you've setup your problem (particle spacing,
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cutoff length, neighbor skin distance, etc). If you really expect
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that many neighbors per particle, then boost the <I>one</I> and <I>page</I>
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settings accordingly.
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</P>
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<P>The <I>binsize</I> option allows you to specify what size of bins will be
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<P>The <I>binsize</I> option allows you to specify what size of bins will be
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used in neighbor list construction to sort and find neighboring atoms.
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used in neighbor list construction to sort and find neighboring atoms.
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By default, for <A HREF = "neighbor.html">neighbor style bin</A>, LAMMPS uses bins
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By default, for <A HREF = "neighbor.html">neighbor style bin</A>, LAMMPS uses bins
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@ -128,6 +128,17 @@ could potentially overflow the list. This threshold is set by the
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{one} value which tells LAMMPS the maximum number of neighbor's one
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{one} value which tells LAMMPS the maximum number of neighbor's one
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atom can have.
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atom can have.
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IMPORTANT NOTE: LAMMPS can crash without an error message if the
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number of neighbors for a single particle is larger than the {page}
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setting, which means it is much, much larger than the {one} setting.
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This is because LAMMPS doesn't error check these limits for every
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pairwise interaction (too costly), but only after all the particle's
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neighbors have been found. This problem usually means something is
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very wrong with the way you've setup your problem (particle spacing,
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cutoff length, neighbor skin distance, etc). If you really expect
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that many neighbors per particle, then boost the {one} and {page}
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settings accordingly.
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The {binsize} option allows you to specify what size of bins will be
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The {binsize} option allows you to specify what size of bins will be
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used in neighbor list construction to sort and find neighboring atoms.
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used in neighbor list construction to sort and find neighboring atoms.
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By default, for "neighbor style bin"_neighbor.html, LAMMPS uses bins
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By default, for "neighbor style bin"_neighbor.html, LAMMPS uses bins
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