/usr/include/liggghts/sph_kernel_cubicspline2D.h is in libliggghts-dev 3.7.0+repack1-1.
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This is the
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╚══════╝╚═╝ ╚═════╝ ╚═════╝ ╚═════╝ ╚═╝ ╚═╝ ╚═╝ ╚══════╝®
DEM simulation engine, released by
DCS Computing Gmbh, Linz, Austria
http://www.dcs-computing.com, office@dcs-computing.com
LIGGGHTS® is part of CFDEM®project:
http://www.liggghts.com | http://www.cfdem.com
Core developer and main author:
Christoph Kloss, christoph.kloss@dcs-computing.com
LIGGGHTS® is open-source, distributed under the terms of the GNU Public
License, version 2 or later. It is distributed in the hope that it will
be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. You should have
received a copy of the GNU General Public License along with LIGGGHTS®.
If not, see http://www.gnu.org/licenses . See also top-level README
and LICENSE files.
LIGGGHTS® and CFDEM® are registered trade marks of DCS Computing GmbH,
the producer of the LIGGGHTS® software and the CFDEM®coupling software
See http://www.cfdem.com/terms-trademark-policy for details.
-------------------------------------------------------------------------
Contributing author and copyright for this file:
Markus Schoergenhumer (JKU Linz)
Copyright 2009-2012 JKU Linz
------------------------------------------------------------------------- */
#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, 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, 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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