/usr/include/liggghts/sph_kernel_wendland2D.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:
Andreas Aigner (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
(
5,
wendland2d,
sph_kernel_wendland2d,
sph_kernel_wendland2d_der,
sph_kernel_wendland2d_cut
)
#else
#ifndef LMP_SPH_KERNEL_WENDLAND2D
#define LMP_SPH_KERNEL_WENDLAND2D
namespace SPH_KERNEL_NS {
inline double sph_kernel_wendland2d(double s, double h, double hinv);
inline double sph_kernel_wendland2d_der(double s, double h, double hinv);
inline double sph_kernel_wendland2d_cut();
}
/* ----------------------------------------------------------------------
Wendland SPH kernel
h is kernel parameter
s is distance normalized by h
0.557042301 is 7 over 4pi
------------------------------------------------------------------------- */
inline double SPH_KERNEL_NS::sph_kernel_wendland2d(double s, double, double hinv)
{
return (0.557042301*hinv*hinv * (1.-0.5*s)*(1.-0.5*s)*(1.-0.5*s)*(1.-0.5*s) * (2.*s+1));
}
/* ----------------------------------------------------------------------
Derivative of Wendland SPH kernel
is equal to grad W if multiplied with radial unit vector
h is kernel parameter
s is distance normalized by h
1.114084602 is 14 over 4pi
------------------------------------------------------------------------- */
inline double SPH_KERNEL_NS::sph_kernel_wendland2d_der(double s, double, double hinv)
{
return (1.114084602*hinv*hinv*hinv * ((1-0.5*s)*(1-0.5*s)*(1-0.5*s)*((1-0.5*s)-(2.*s+1))));
}
/* ----------------------------------------------------------------------
Definition of Wendland SPH kernel cutoff in terms of s
s is normalized distance
------------------------------------------------------------------------- */
inline double SPH_KERNEL_NS::sph_kernel_wendland2d_cut()
{
return 2.;
}
#endif
#endif
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