/usr/include/liggghts/sph_kernel_cubicspline2D.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 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | /* ----------------------------------------------------------------------
LIGGGHTS - LAMMPS Improved for General Granular and Granular Heat
Transfer Simulations
LIGGGHTS is part of the CFDEMproject
www.liggghts.com | www.cfdem.com
Christoph Kloss, christoph.kloss@cfdem.com
Copyright 2009-2012 JKU Linz
Copyright 2012- DCS Computing GmbH, Linz
LIGGGHTS is based on LAMMPS
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
This software is distributed under the GNU General Public License.
See the README file in the top-level directory.
------------------------------------------------------------------------- */
/* ----------------------------------------------------------------------
Contributing author for SPH:
Andreas Aigner (CD Lab Particulate Flow Modelling, JKU)
andreas.aigner@jku.at
------------------------------------------------------------------------- */
/*-----------------------------------------------------------------------
cubicspline_2D implementation by Markus Schörgenhumer, mkschoe@gmail.com
------------------------------------------------------------------------- */
#ifdef SPH_KERNEL_CLASS
// kernel identifier (a unique integer >= 0)
// a name for the kernel
// name of the functions for the kernel, its derivative, and the cutoff are defined
SPHKernel
(
1,
cubicspline2d,
sph_kernel_cubicspline2d,
sph_kernel_cubicspline2d_der,
sph_kernel_cubicspline2d_cut
)
#else
#ifndef LMP_SPH_KERNEL_CUBICSPLINE2D
#define LMP_SPH_KERNEL_CUBICSPLINE2D
namespace SPH_KERNEL_NS {
inline double sph_kernel_cubicspline2d(double s, double h, double hinv);
inline double sph_kernel_cubicspline2d_der(double s, double h, double hinv);
inline double sph_kernel_cubicspline2d_cut();
}
/* ----------------------------------------------------------------------
Cubic spline SPH kernel
h is kernel parameter
s is distance normalized by h
0.1136821 is 5 over 14pi
------------------------------------------------------------------------- */
inline double SPH_KERNEL_NS::sph_kernel_cubicspline2d(double s, double h, double hinv)
{
if (s < 1.)
{
return (0.1136821*hinv*hinv * ((2.-s)*(2.-s)*(2.-s) - 4.*(1.-s)*(1.-s)*(1.-s)));
}
else
{
return (0.1136821*hinv*hinv * ((2.-s)*(2.-s)*(2.-s)));
}
}
/* ----------------------------------------------------------------------
Derivative of cubic spline SPH kernel
is equal to grad W if multiplied with radial unit vector
h is kernel parameter
s is distance normalized by h
0.1136821 is 5 over 14pi
------------------------------------------------------------------------- */
inline double SPH_KERNEL_NS::sph_kernel_cubicspline2d_der(double s,double h, double hinv)
{
if (s < 1.)
{
return (0.1136821*hinv*hinv*hinv * (-3.*(2.-s)*(2.-s) + 12.*(1.-s)*(1.-s)));
}
else
{
return (0.1136821*hinv*hinv*hinv * (-3.*(2.-s)*(2.-s)));
}
}
/* ----------------------------------------------------------------------
Definition of cubic spline SPH kernel cutoff in terms of s
s is normalized distance
------------------------------------------------------------------------- */
inline double SPH_KERNEL_NS::sph_kernel_cubicspline2d_cut()
{
return 2.;
}
#endif
#endif
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