mirror of https://github.com/lammps/lammps.git
git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@774 f3b2605a-c512-4ea7-a41b-209d697bcdaa
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5e8f3a7b93
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@ -47,11 +47,14 @@ orthogonal box.
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</P>
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</P>
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<P><B>Restrictions:</B>
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<P><B>Restrictions:</B>
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</P>
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</P>
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<P>When this command is used, no <A HREF = "dump.html">dumps</A> can be defined, nor
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<P>At the point in the input script when this command is issued, no
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can <A HREF = "fix_ave_spatial.html">fix ave/spatial</A> or <A HREF = "fix_deform.html">fix
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<A HREF = "dump.html">dumps</A> can be active, nor can a <A HREF = "fix_ave_spatial.html">fix
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deform</A> be defined. This is because these commands
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ave/spatial</A> or <A HREF = "fix_deform.html">fix deform</A> be
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test whether the simulation box is orthogonal or not when they are
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active. This is because these commands test whether the simulation
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first issued.
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box is orthogonal when they are first issued. Note that these
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commmands can appear in your script before a change_box command is
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issued, so long as an <A HREF = "undump.html">undump</A> or <A HREF = "unfix.html">unfix</A>
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command is also used to turn them off.
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</P>
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</P>
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<P><B>Related commands:</B> none
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<P><B>Related commands:</B> none
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</P>
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</P>
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@ -43,11 +43,14 @@ orthogonal box.
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[Restrictions:]
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[Restrictions:]
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When this command is used, no "dumps"_dump.html can be defined, nor
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At the point in the input script when this command is issued, no
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can "fix ave/spatial"_fix_ave_spatial.html or "fix
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"dumps"_dump.html can be active, nor can a "fix
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deform"_fix_deform.html be defined. This is because these commands
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ave/spatial"_fix_ave_spatial.html or "fix deform"_fix_deform.html be
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test whether the simulation box is orthogonal or not when they are
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active. This is because these commands test whether the simulation
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first issued.
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box is orthogonal when they are first issued. Note that these
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commmands can appear in your script before a change_box command is
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issued, so long as an "undump"_undump.html or "unfix"_unfix.html
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command is also used to turn them off.
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[Related commands:] none
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[Related commands:] none
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@ -46,13 +46,13 @@ velocity which is used to compute the temperature.
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</P>
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</P>
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<P>IMPORTANT NOTE: <A HREF = "fix_deform.html">Fix deform</A> has an option for
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<P>IMPORTANT NOTE: <A HREF = "fix_deform.html">Fix deform</A> has an option for
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remapping either atom coordinates or velocities to the changing
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remapping either atom coordinates or velocities to the changing
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simulation box. To use this compute, the fix should NOT remap atom
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simulation box. To use this compute, fix deform should NOT remap atom
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positions, but rather should let atoms respond to the changing box by
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positions, but rather should let atoms respond to the changing box by
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adjusting their own velocities (or let fix deform remap the atom
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adjusting their own velocities (or let fix deform remap the atom
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velocities). If the fix does remap atom positions, their velocity is
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velocities). If fix deform does remap atom positions, their velocity
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not changed, and thus they do not have the streaming velocity assumed
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is not changed, and thus they do not have the streaming velocity
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by this compute. LAMMPS will warn you if this setting is not
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assumed by this compute. LAMMPS will warn you if the fix deform
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consistent.
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setting is not consistent with this compute.
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</P>
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</P>
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<P>The temperature is calculated by the formula KE = dim/2 N k T, where
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<P>The temperature is calculated by the formula KE = dim/2 N k T, where
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KE = total kinetic energy of the group of atoms (sum of 1/2 m v^2),
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KE = total kinetic energy of the group of atoms (sum of 1/2 m v^2),
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@ -43,13 +43,13 @@ velocity which is used to compute the temperature.
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IMPORTANT NOTE: "Fix deform"_fix_deform.html has an option for
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IMPORTANT NOTE: "Fix deform"_fix_deform.html has an option for
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remapping either atom coordinates or velocities to the changing
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remapping either atom coordinates or velocities to the changing
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simulation box. To use this compute, the fix should NOT remap atom
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simulation box. To use this compute, fix deform should NOT remap atom
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positions, but rather should let atoms respond to the changing box by
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positions, but rather should let atoms respond to the changing box by
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adjusting their own velocities (or let fix deform remap the atom
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adjusting their own velocities (or let fix deform remap the atom
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velocities). If the fix does remap atom positions, their velocity is
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velocities). If fix deform does remap atom positions, their velocity
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not changed, and thus they do not have the streaming velocity assumed
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is not changed, and thus they do not have the streaming velocity
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by this compute. LAMMPS will warn you if this setting is not
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assumed by this compute. LAMMPS will warn you if the fix deform
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consistent.
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setting is not consistent with this compute.
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The temperature is calculated by the formula KE = dim/2 N k T, where
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The temperature is calculated by the formula KE = dim/2 N k T, where
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KE = total kinetic energy of the group of atoms (sum of 1/2 m v^2),
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KE = total kinetic energy of the group of atoms (sum of 1/2 m v^2),
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@ -50,9 +50,8 @@
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V = change tilt factor at this velocity (distance/time units),
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V = change tilt factor at this velocity (distance/time units),
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effectively an engineering shear strain rate
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effectively an engineering shear strain rate
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<I>erate</I> value = R
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<I>erate</I> value = R
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R = engineering shear strain rate (1/time units)
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R = engineering shear strain rate (1/time units)
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</PRE>
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<I>trate</I> value = R
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<PRE> <I>trate</I> value = R
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R = true shear strain rate (1/time units)
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R = true shear strain rate (1/time units)
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</PRE>
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</PRE>
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<LI>zero or more keyword/value pairs may be appended
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<LI>zero or more keyword/value pairs may be appended
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@ -337,10 +336,9 @@ used. This is because <A HREF = "fix_nvt_sllod.html">fix nvt/sllod</A> adjusts
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atom positions and velocities to provide a velocity profile that
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atom positions and velocities to provide a velocity profile that
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matches the changing box size/shape. Thus atom coordinates should NOT
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matches the changing box size/shape. Thus atom coordinates should NOT
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be remapped by fix deform, but velocities SHOULD be when atoms cross
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be remapped by fix deform, but velocities SHOULD be when atoms cross
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periodic boundaries, since when atoms cross periodic boundaries since
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periodic boundaries, since that is consistent with maintaining the
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that is consistent with maintaining the velocity profile created by
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velocity profile already created by fix nvt/sllod. LAMMPS will warn
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fix nvt/sllod. LAMMPS will warn you if this settings is not
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you if the <I>remap</I> setting is not consistent with fix nvt/sllod.
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consistent.
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</P>
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</P>
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<P>The <I>units</I> keyword determines the meaning of the distance units used
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<P>The <I>units</I> keyword determines the meaning of the distance units used
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to define various arguments. A <I>box</I> value selects standard distance
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to define various arguments. A <I>box</I> value selects standard distance
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@ -43,7 +43,7 @@ parameter = {x} or {y} or {z} or {xy} or {xz} or {yz}
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V = change tilt factor at this velocity (distance/time units),
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V = change tilt factor at this velocity (distance/time units),
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effectively an engineering shear strain rate
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effectively an engineering shear strain rate
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{erate} value = R
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{erate} value = R
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R = engineering shear strain rate (1/time units) :pre
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R = engineering shear strain rate (1/time units)
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{trate} value = R
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{trate} value = R
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R = true shear strain rate (1/time units) :pre
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R = true shear strain rate (1/time units) :pre
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@ -326,10 +326,9 @@ used. This is because "fix nvt/sllod"_fix_nvt_sllod.html adjusts the
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atom positions and velocities to provide a velocity profile that
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atom positions and velocities to provide a velocity profile that
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matches the changing box size/shape. Thus atom coordinates should NOT
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matches the changing box size/shape. Thus atom coordinates should NOT
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be remapped by fix deform, but velocities SHOULD be when atoms cross
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be remapped by fix deform, but velocities SHOULD be when atoms cross
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periodic boundaries, since when atoms cross periodic boundaries since
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periodic boundaries, since that is consistent with maintaining the
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that is consistent with maintaining the velocity profile created by
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velocity profile already created by fix nvt/sllod. LAMMPS will warn
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fix nvt/sllod. LAMMPS will warn you if this settings is not
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you if the {remap} setting is not consistent with fix nvt/sllod.
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consistent.
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The {units} keyword determines the meaning of the distance units used
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The {units} keyword determines the meaning of the distance units used
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to define various arguments. A {box} value selects standard distance
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to define various arguments. A {box} value selects standard distance
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