forked from lijiext/lammps
Updated doc pages for pair body rounded/polygon and rounded/polyhedra
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@ -18,8 +18,6 @@ mu = normal friction coefficient during gross sliding
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delta_ua = multiple contact scaling factor
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cutoff = global separation cutoff for interactions (distance units), see below for definition :pre
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NOTE: what does gross sliding mean?
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[Examples:]
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pair_style body/rounded/polygon 20.0 5.0 0.0 1.0 0.5
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@ -38,7 +36,7 @@ body particles.
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This pairwise interaction between rounded polygons is described in
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"Fraige"_#Fraige, where a polygon does not have sharp corners, but is
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rounded at its vertices by circles centered on each vertex with a
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specified diameter. The edges of the polygon are defined bewteen
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specified diameter. The edges of the polygon are defined between
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pairs of adjacent vertices. The circle diameter for each polygon is
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specified in the data file read by the "read data"_read_data.html
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command. This is a 2d discrete element model (DEM) which allows for
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@ -47,7 +45,7 @@ multiple contact points.
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Note that when two particles interact, the effective surface of each
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polygon particle is displaced outward from each of its vertices and
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edges by half its circle diameter. The interaction forces and
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energies bewteen two particles are defined with respect to the
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energies between two particles are defined with respect to the
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separation of their respective rounded surfaces, not by the separation
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of the vertices and edges themselves.
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@ -65,7 +63,15 @@ explains how contact is defined? Do we need an equation(s) that
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explain what the params in pair style and coeff mean, for damping and
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spring constants? Or do we just want to reference the paper for that?
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NOTE: say something about no frictional history ?
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In "Fraige"_#Fraige, the tangential friction force between two particles
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that are in contact is modeled differently prior to gross sliding
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(i.e. static friction) and during gross-sliding (kinetic friction).
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The latter takes place when the tangential deformation exceeds
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the Coulomb frictional limit. In the current implementation, however,
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we do not take into account frictional history, i.e. we do not keep track
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of how many time steps the two particles have been in contact
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nor calculate the tangential deformation. We assume that gross sliding
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takes place right when two particles are in contact.
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The following coefficients must be defined for each pair of atom types
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via the "pair_coeff"_pair_coeff.html command as in the examples above,
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@ -16,9 +16,7 @@ c_n = normal damping coefficient
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c_t = tangential damping coefficient
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mu = normal friction coefficient during gross sliding
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delta_ua = multiple contact scaling factor
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cutoff = global sepration cutoff for interactions (distance units), see below for definition :pre
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NOTE: what does gross sliding mean?
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cutoff = global separation cutoff for interactions (distance units), see below for definition :pre
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[Examples:]
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@ -39,16 +37,16 @@ This pairwise interaction between rounded polyhedra is described in
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"Wang"_#Wang, where a polyhedron does not have sharp corners and
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edges, but is rounded at its vertices and edges by spheres centered on
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each vertex with a specified diameter. The edges if the polyhedron
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are defined bewteen pairs of adjacent vertices. Its faces are defined
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are defined between pairs of adjacent vertices. Its faces are defined
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by a loop of edges. The sphere diameter for each polygon is specified
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in the data file read by the "read data"_read_data.html command. This
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is a discrete element model (DEM) which allows for multiple contact
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points.
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Note that when two particles interaact, the effective surface of each
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Note that when two particles interact, the effective surface of each
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polyhedron particle is displaced outward from each of its vertices,
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edges, and faces by half its sphere diameter. The interaction forces
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and energies bewteen two particles are defined with respect to the
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and energies between two particles are defined with respect to the
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separation of their respective rounded surfaces, not by the separation
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of the vertices, edges, and faces themselves.
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@ -66,7 +64,15 @@ explains how contact is defined? Do we need an equation(s) that
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explain what the params in pair style and coeff mean, for damping and
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spring constants? Or do we just want to reference the paper for that?
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NOTE: say something about no frictional history ?
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In "Wang"_#Wang, the tangential friction force between two particles
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that are in contact is modeled differently prior to gross sliding
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(i.e. static friction) and during gross-sliding (kinetic friction).
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The latter takes place when the tangential deformation exceeds
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the Coulomb frictional limit. In the current implementation, however,
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we do not take into account frictional history, i.e. we do not keep track
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of how many time steps the two particles have been in contact
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nor calculate the tangential deformation. We assume that gross sliding
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takes place right when two particles are in contact.
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The following coefficients must be defined for each pair of atom types
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via the "pair_coeff"_pair_coeff.html command as in the examples above,
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