/usr/include/liggghts/fix_viscosity.h is in libliggghts-dev 2.3.8-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 | /* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
#ifdef FIX_CLASS
FixStyle(viscosity,FixViscosity)
#else
#ifndef LMP_FIX_VISCOSITY_H
#define LMP_FIX_VISCOSITY_H
#include "fix.h"
namespace LAMMPS_NS {
class FixViscosity : public Fix {
public:
FixViscosity(class LAMMPS *, int, char **);
~FixViscosity();
int setmask();
void init();
void end_of_step();
double compute_scalar();
private:
int me;
int vdim,pdim,nbin,periodicity;
int nswap;
double vtarget;
double prd,boxlo,boxhi;
double slablo_lo,slablo_hi,slabhi_lo,slabhi_hi;
double p_exchange;
int npositive,nnegative;
int *pos_index,*neg_index;
double *pos_delta,*neg_delta;
};
}
#endif
#endif
/* ERROR/WARNING messages:
E: 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.
E: Fix viscosity swap value must be positive
Self-explanatory.
E: Fix viscosity vtarget value must be positive
Self-explanatory.
W: Fix viscosity comes before fix ave/spatial
The order of these 2 fixes in your input script is such that
fix viscosity comes first. If you are using fix ave/spatial
to measure the velocity profile induced by fix viscosity, then
this may cause a glitch in the profile since you are averaging
immediately after swaps have occurred. Flipping the order
of the 2 fixes typically helps.
*/
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