LIGGGHTS WWW Site - LIGGGHTS Documentation - LIGGGHTS Commands
Syntax:
fix ID group-ID mesh/gran filename walltype scalefactor xoff yoff zoff phix phiy phiz keyword values
ID, group-ID are documented in fix command
mesh/gran/stressanalysis = style name of this fix command
filename, walltype, scalefactor, xoff, yoff,zoff , phix, phiy, phiz are documented in fix mesh/gran.
zero or more keyword/value pairs may be appended
keyword = finnie
finnie value = yes or no
LIGGGHTS vs. LAMMPS Info:
This command is not available in LAMMPS.
Description:
This fix is identical to fix mesh/gran except for the fact that the pressure and shear force that the particles in the fix group exert on each triangle of the mesh is evaluated (which may cost a little bit in performance).
The forces can be dumped into VTK format using the following command:
dump id group mesh/gran/VTK N file stress
which is similar to the dump stl command except for the fact that a VTK file is written instead of an STL file which contains the STL data as well as pressure and shear stress. See dump mesh/gran/VTK for details.
The optional finnie keyword activates a simple qualitative wear model - for details on the model, see the seperate /doc/finnie-wear.pdf. The finnie constant k in 4.23 has to be specified as follows:
fix id all property/global k_finnie peratomtypepair n_atomtypes value_11 value_12 .. value_21 value_22 .. .
(value_ij=value for the finnie constant between atom type i and j; n_atomtypes is the number of atom types you want to use in your simulation)
Restart, fix_modify, output, run start/stop, minimize info:
This fix stores a global vector with 6 components for access by various output commands. The first 3 components are equal to the total force on the mesh, the last 3 components store the total torque on the body exerted by the particles. Other info see fix mesh/gran.
Related commands:
Default:
finnie = no