Page Menu
Home
c4science
Search
Configure Global Search
Log In
Files
F80918410
fix_lb_viscous.cpp
No One
Temporary
Actions
Download File
Edit File
Delete File
View Transforms
Subscribe
Mute Notifications
Award Token
Subscribers
None
File Metadata
Details
File Info
Storage
Attached
Created
Tue, Sep 3, 06:16
Size
3 KB
Mime Type
text/x-c
Expires
Thu, Sep 5, 06:16 (1 d, 21 h)
Engine
blob
Format
Raw Data
Handle
20121748
Attached To
rLAMMPS lammps
fix_lb_viscous.cpp
View Options
/* ----------------------------------------------------------------------
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.
------------------------------------------------------------------------- */
/* ----------------------------------------------------------------------
Contributing authors: Frances Mackay, Santtu Ollila, Colin Denniston (UWO)
------------------------------------------------------------------------- */
#include "math.h"
#include "stdlib.h"
#include "string.h"
#include "fix_lb_viscous.h"
#include "atom.h"
#include "update.h"
#include "respa.h"
#include "error.h"
#include "fix_lb_fluid.h"
#include "modify.h"
#include "group.h"
using namespace LAMMPS_NS;
using namespace FixConst;
/* ---------------------------------------------------------------------- */
FixLbViscous::FixLbViscous(LAMMPS *lmp, int narg, char **arg) :
Fix(lmp, narg, arg)
{
if (narg < 3) error->all(FLERR,"Illegal fix lb/viscous command");
int groupbit_lb_fluid = 0;
for(int ifix=0; ifix<modify->nfix; ifix++)
if(strcmp(modify->fix[ifix]->style,"lb/fluid")==0){
fix_lb_fluid = (FixLbFluid *)modify->fix[ifix];
groupbit_lb_fluid = group->bitmask[modify->fix[ifix]->igroup];
}
if(groupbit_lb_fluid == 0)
error->all(FLERR,"the lb/fluid fix must also be used if using the lb/viscous fix");
int *mask = atom->mask;
int nlocal = atom->nlocal;
for(int j=0; j<nlocal; j++){
if((mask[j] & groupbit) && !(mask[j] & groupbit_lb_fluid))
error->one(FLERR,"to apply a fluid force onto an atom, the lb/fluid fix must be used for that atom.");
}
}
/* ---------------------------------------------------------------------- */
FixLbViscous::~FixLbViscous()
{
}
/* ---------------------------------------------------------------------- */
int FixLbViscous::setmask()
{
int mask = 0;
mask |= POST_FORCE;
mask |= POST_FORCE_RESPA;
mask |= MIN_POST_FORCE;
return mask;
}
/* ---------------------------------------------------------------------- */
void FixLbViscous::init()
{
if (strcmp(update->integrate_style,"respa") == 0)
nlevels_respa = ((Respa *) update->integrate)->nlevels;
}
/* ---------------------------------------------------------------------- */
void FixLbViscous::setup(int vflag)
{
if (strcmp(update->integrate_style,"verlet") == 0)
post_force(vflag);
else {
((Respa *) update->integrate)->copy_flevel_f(nlevels_respa-1);
post_force_respa(vflag,nlevels_respa-1,0);
((Respa *) update->integrate)->copy_f_flevel(nlevels_respa-1);
}
}
/* ---------------------------------------------------------------------- */
void FixLbViscous::min_setup(int vflag)
{
post_force(vflag);
}
/* ---------------------------------------------------------------------- */
void FixLbViscous::post_force(int vflag)
{
// apply drag force to atoms in group
// direction is opposed to velocity vector
// magnitude depends on atom type
double **f = atom->f;
int *mask = atom->mask;
int nlocal = atom->nlocal;
double **hydroF = fix_lb_fluid->hydroF;
for (int i = 0; i < nlocal; i++)
if (mask[i] & groupbit) {
f[i][0] += hydroF[i][0];
f[i][1] += hydroF[i][1];
f[i][2] += hydroF[i][2];
}
}
/* ---------------------------------------------------------------------- */
void FixLbViscous::post_force_respa(int vflag, int ilevel, int iloop)
{
if (ilevel == nlevels_respa-1) post_force(vflag);
}
/* ---------------------------------------------------------------------- */
void FixLbViscous::min_post_force(int vflag)
{
post_force(vflag);
}
Event Timeline
Log In to Comment