lammps/lib/cuda/fix_viscous_cuda_kernel.cu

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/* ----------------------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
Original Version:
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
See the README file in the top-level LAMMPS directory.
-----------------------------------------------------------------------
USER-CUDA Package and associated modifications:
https://sourceforge.net/projects/lammpscuda/
Christian Trott, christian.trott@tu-ilmenau.de
Lars Winterfeld, lars.winterfeld@tu-ilmenau.de
Theoretical Physics II, University of Technology Ilmenau, Germany
See the README file in the USER-CUDA directory.
This software is distributed under the GNU General Public License.
------------------------------------------------------------------------- */
__global__ void Cuda_FixViscousCuda_PostForce_Kernel(int groupbit, F_CFLOAT* gamma)
{
int i = (blockIdx.x * gridDim.y + blockIdx.y) * blockDim.x + threadIdx.x;
if(i < _nlocal)
if(_mask[i] & groupbit) {
F_CFLOAT drag = gamma[_type[i]];
_f[i] -= drag * _v[i];
_f[i + 1 * _nmax] -= drag * _v[i + 1 * _nmax];
_f[i + 2 * _nmax] -= drag * _v[i + 2 * _nmax];
}
}