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fix mesh/gran/stressanalysis command

Syntax:

fix ID group-ID mesh/gran filename walltype scalefactor xoff yoff zoff phix phiy phiz keyword values

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:

fix mesh/gran

Default:

finnie = no