ERROR: Illegal fix lb/rigid/pc/sphere command

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1

Hello I’m going to add hydrodynamic forces on my particles with lattice boltzmann package and as the document says I have to use fix lb/rigid/pc/sphere command because I’m not using default coupling constant, but I get Illegal fix error:

fix flu all lb/fluid 5 1 3.0 0.864 setGamma 20 dx 2 noise 1 8979873 calcforce 1000 poly printfluid 1000
fix flow all lb/rigid/pc/sphere force 1 0 0 innerNodes ForceAtoms

Using a lattice-Boltzmann grid of 5 by 5 by 5 total grid points. (…/fix_lb_fluid.cpp:382)
ERROR: Illegal fix lb/rigid/pc/sphere command (…/fix_lb_rigid_pc_sphere.cpp:180)

which I have no idea of this problem. I’m using LAMMPS (1 Feb 2014) so I have user-lb package.

please answer my question

thanks

2

Hello I'm going to add hydrodynamic forces on my particles with lattice
boltzmann package and as the document says I have to use fix
lb/rigid/pc/sphere command because I'm not using default coupling constant,
but I get Illegal fix error:

fix flu all lb/fluid 5 1 3.0 0.864 setGamma 20 dx 2 noise 1 8979873
calcforce 1000 poly printfluid 1000
fix flow all lb/rigid/pc/sphere force 1 0 0 innerNodes ForceAtoms

Using a lattice-Boltzmann grid of 5 by 5 by 5 total grid points.
(../fix_lb_fluid.cpp:382)
ERROR: Illegal fix lb/rigid/pc/sphere command
(../fix_lb_rigid_pc_sphere.cpp:180)

which I have no idea of this problem. I'm using LAMMPS (1 Feb 2014) so I
have user-lb package.

from http://lammps.sandia.gov/doc/Section_errors.html :

Illegal ... command

  Self-explanatory. Check the input script syntax and compare to the
documentation for the command. You can use -echo screen as a
command-line option when running LAMMPS to see the offending line.