(1a589c7a) · Commits · 郑智淋 / lammps

doc/bond_class2.html

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		@@ -37,8 +37,8 @@ or <A HREF = "read_restart.html">read_restart</A> commands:
		</P>
		<UL><LI>R0 (distance)
		<LI>K2 (energy/distance^2)
		<LI>K3 (energy/distance^2)
		<LI>K4 (energy/distance^2)
		<LI>K3 (energy/distance^3)
		<LI>K4 (energy/distance^4)
		</UL>
		<P><B>Restrictions:</B>
		</P>

doc/bond_class2.txt

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		@@ -34,8 +34,8 @@ or "read_restart"_read_restart.html commands:

		R0 (distance)
		K2 (energy/distance^2)
		K3 (energy/distance^2)
		K4 (energy/distance^2) :ul
		K3 (energy/distance^3)
		K4 (energy/distance^4) :ul

		[Restrictions:]

doc/fix_langevin.html

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		@@ -173,6 +173,8 @@ viscous</A>, <A HREF = "fix_nvt.html">fix nvt</A>
		<P>The option defaults are axes = 1 1 1, scale = 1.0 for all types, no
		region, and weight = 1.0.
		</P>
		<HR>

		<A NAME = "Dunweg"></A>

		<P><B>(Dunweg)</B> Dunweg and Paul, Int J of Modern Physics C, 2, 817-27 (1991).

doc/fix_langevin.txt

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		@@ -164,5 +164,7 @@ viscous"_fix_viscous.html, "fix nvt"_fix_nvt.html
		The option defaults are axes = 1 1 1, scale = 1.0 for all types, no
		region, and weight = 1.0.

		:line

		:link(Dunweg)
		[(Dunweg)] Dunweg and Paul, Int J of Modern Physics C, 2, 817-27 (1991).

doc/fix_wall_gran.html

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		@@ -24,7 +24,7 @@
		<LI>args = list of arguments for a particular style

		<PRE> <I>xplane</I> or <I>yplane</I> or <I>zplane</I> args = lo hi gamma xmu
		lo, hi = position of lower and upper plane (either can be NULL)
		lo,hi = position of lower and upper plane (distance units), either can be NULL)
		gamman = damping coeff for normal direction collisions with wall
		xmu = friction coeff for the wall
		<I>zcylinder</I> args = radius gamma xmu
		@@ -34,11 +34,15 @@
		</PRE>
		<LI>zero or more keyword/value pairs may be appended to args

		<PRE> keyword = <I>wiggle</I>
		values = dim amplitude period
		<LI>keyword = <I>wiggle</I> or <I>shear</I>

		<PRE> <I>wiggle</I> values = dim amplitude period
		dim = <I>x</I> or <I>y</I> or <I>z</I>
		amplitude = size of oscillation (distance units)
		period = time of oscillation (time units)
		<I>shear</I> values = dim vshear
		dim = <I>x</I> or <I>y</I> or <I>z</I>
		vshear = magnitude of shear velocity (velocity units)
		</PRE>

		</UL>
		@@ -62,20 +66,38 @@ axis is at x = y = 0.0, and the radius of the cylinder is specified.
		For all wallstyles, a damping and friction coefficient for
		particle-wall interactions are also specified.
		</P>
		<P>Optionally, a wall can be oscillated, similar to the oscillations of
		frozen particles specified by the <A HREF = "fix_wiggle.html">fix_wiggle</A>
		command. This is useful in packing simulations of granular particles.
		If the keyword <I>wiggle</I> is appended to the argument list, then a
		dimension for the motion, as well as it's <I>amplitude</I> and <I>period</I> is
		specified. Each timestep, the position of the wall in the appropriate
		<I>dim</I> is set according to this equation:
		<P>Optionally, the wall can be moving, if the <I>wiggle</I> or <I>shear</I>
		keywords are appended. Both keywords cannot be used together.
		</P>
		<P>For the <I>wiggle</I> keyword, the wall oscillates sinusoidally, similar to
		the oscillations of frozen particles specified by the
		<A HREF = "fix_wiggle.html">fix_wiggle</A> command. This is useful in packing
		simulations of granular particles. The arguments to the <I>wiggle</I>
		keyword specify a dimension for the motion, as well as it's
		<I>amplitude</I> and <I>period</I>. Note that if the dimension is in the plane
		of the wall, this is effectively a shearing motion. If the dimension
		is perpendicular to the wall, it is more of a shaking motion. A
		<I>zcylinder</I> wall can only be wiggled in the z dimension.
		</P>
		<P>Each timestep, the position of a wiggled wall in the appropriate <I>dim</I>
		is set according to this equation:
		</P>
		<PRE>position = pos0 + A - A cos (omega * delta)
		</PRE>
		<P>where <I>pos0</I> is the position at the time the fix was specified, <I>A</I> is
		the <I>amplitude</I>, <I>omega</I> is 2 PI / <I>period</I>, and <I>delta</I> is the
		elapsed time since the fix was specified. The velocity of the wall is
		also set to the derivative of this expression.
		set to the derivative of this expression.
		</P>
		<P>For the <I>shear</I> keyword, the wall moves continuously in the specified
		dimension with velocity <I>vshear</I>. The dimension must be tangential to
		walls with a planar <I>wallstyle</I>, e.g. in the <I>y</I> or <I>z</I> directions for
		an <I>xplane</I> wall. For <I>zcylinder</I> walls, a dimension of <I>z</I> means the
		cylinder is moving in the z-direction along it's axis. A dimension of
		<I>x</I> or <I>y</I> means the cylinder is spinning around the z-axis, either in
		the clockwise direction for <I>vshear</I> > 0 or counter-clockwise for
		<I>vshear</I> < 0. In this case, <I>vshear</I> is the tangential velocity of
		the wall at whatever <I>radius</I> has been defined.
		</P>
		<P><B>Restart, fix_modify, output, run start/stop, minimize info:</B>
		</P>
		@@ -102,8 +124,6 @@ LAMMPS</A> section for more info.
		</P>
		<P>Any dimension (xyz) that has a granular wall must be non-periodic.
		</P>
		<P>A zcylinder wall can only be oscillated in the z dimension.
		</P>
		<P><B>Related commands:</B>
		</P>
		<P><A HREF = "fix_wiggle.html">fix_wiggle</A>

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