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ngb.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include <mpi.h>
#include "allvars.h"
#include "proto.h"
/*! \file ngb.c
* \brief neighbour search by means of the tree
*
* This file contains routines for neighbour finding. We use the
* gravity-tree and a range-searching technique to find neighbours.
*/
#ifdef PERIODIC
static double boxSize, boxHalf;
#ifdef LONG_X
static double boxSize_X, boxHalf_X;
#else
#define boxSize_X boxSize
#define boxHalf_X boxHalf
#endif
#ifdef LONG_Y
static double boxSize_Y, boxHalf_Y;
#else
#define boxSize_Y boxSize
#define boxHalf_Y boxHalf
#endif
#ifdef LONG_Z
static double boxSize_Z, boxHalf_Z;
#else
#define boxSize_Z boxSize
#define boxHalf_Z boxHalf
#endif
#endif
/*! these macros maps a coordinate difference to the nearest periodic
* image
*/
#define NGB_PERIODIC_X(x) (xtmp=(x),(xtmp>boxHalf_X)?(xtmp-boxSize_X):((xtmp<-boxHalf_X)?(xtmp+boxSize_X):xtmp))
#define NGB_PERIODIC_Y(x) (xtmp=(x),(xtmp>boxHalf_Y)?(xtmp-boxSize_Y):((xtmp<-boxHalf_Y)?(xtmp+boxSize_Y):xtmp))
#define NGB_PERIODIC_Z(x) (xtmp=(x),(xtmp>boxHalf_Z)?(xtmp-boxSize_Z):((xtmp<-boxHalf_Z)?(xtmp+boxSize_Z):xtmp))
/*! This routine finds all neighbours `j' that can interact with the
* particle `i' in the communication buffer.
*
* Note that an interaction can take place if
* \f$ r_{ij} < h_i \f$ OR if \f$ r_{ij} < h_j \f$.
*
* In the range-search this is taken into account, i.e. it is guaranteed that
* all particles are found that fulfil this condition, including the (more
* difficult) second part of it. For this purpose, each node knows the
* maximum h occuring among the particles it represents.
*/
int ngb_treefind_pairs(FLOAT searchcenter[3], FLOAT hsml, int phase, int *startnode)
{
int k, no, p, numngb;
FLOAT hdiff;
FLOAT searchmin[3], searchmax[3];
struct NODE *this;
#ifdef PERIODIC
double xtmp;
#endif
for(k = 0; k < 3; k++) /* cube-box window */
{
searchmin[k] = searchcenter[k] - hsml;
searchmax[k] = searchcenter[k] + hsml;
}
numngb = 0;
no = *startnode;
while(no >= 0)
{
if(no < All.MaxPart) /* single particle */
{
p = no;
no = Nextnode[no];
if(P[p].Type > 0)
continue;
#ifdef MULTIPHASE
/* WARNING - WARNING - WARNING - WARNING */
/* keep only particles of same phase */
//if(SphP[p].Phase != phase)
// continue;
/* WARNING - WARNING - WARNING - WARNING */
/* this may be problematic for the feedback */
/* sticky sees only sticky */
//if ((phase==GAS_STICKY) && SphP[p].Phase!=GAS_STICKY)
// continue;
#endif
hdiff = SphP[p].Hsml - hsml;
if(hdiff < 0)
hdiff = 0;
#ifdef PERIODIC
if(NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]) < (-hsml - hdiff))
continue;
if(NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]) > (hsml + hdiff))
continue;
if(NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]) < (-hsml - hdiff))
continue;
if(NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]) > (hsml + hdiff))
continue;
if(NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]) < (-hsml - hdiff))
continue;
if(NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]) > (hsml + hdiff))
continue;
#else
if(P[p].Pos[0] < (searchmin[0] - hdiff))
continue;
if(P[p].Pos[0] > (searchmax[0] + hdiff))
continue;
if(P[p].Pos[1] < (searchmin[1] - hdiff))
continue;
if(P[p].Pos[1] > (searchmax[1] + hdiff))
continue;
if(P[p].Pos[2] < (searchmin[2] - hdiff))
continue;
if(P[p].Pos[2] > (searchmax[2] + hdiff))
continue;
#endif
Ngblist[numngb++] = p;
if(numngb == MAX_NGB)
{
printf
("ThisTask=%d: Need to do a second neighbour loop in hydro-force for (%g|%g|%g) hsml=%g no=%d\n",
ThisTask, searchcenter[0], searchcenter[1], searchcenter[2], hsml, no);
*startnode = no;
return numngb;
}
}
else
{
if(no >= All.MaxPart + MaxNodes) /* pseudo particle */
{
Exportflag[DomainTask[no - (All.MaxPart + MaxNodes)]] = 1;
no = Nextnode[no - MaxNodes];
continue;
}
this = &Nodes[no];
hdiff = Extnodes[no].hmax - hsml;
if(hdiff < 0)
hdiff = 0;
no = this->u.d.sibling; /* in case the node can be discarded */
#ifdef PERIODIC
if((NGB_PERIODIC_X(this->center[0] - searchcenter[0]) + 0.5 * this->len) < (-hsml - hdiff))
continue;
if((NGB_PERIODIC_X(this->center[0] - searchcenter[0]) - 0.5 * this->len) > (hsml + hdiff))
continue;
if((NGB_PERIODIC_Y(this->center[1] - searchcenter[1]) + 0.5 * this->len) < (-hsml - hdiff))
continue;
if((NGB_PERIODIC_Y(this->center[1] - searchcenter[1]) - 0.5 * this->len) > (hsml + hdiff))
continue;
if((NGB_PERIODIC_Z(this->center[2] - searchcenter[2]) + 0.5 * this->len) < (-hsml - hdiff))
continue;
if((NGB_PERIODIC_Z(this->center[2] - searchcenter[2]) - 0.5 * this->len) > (hsml + hdiff))
continue;
#else
if((this->center[0] + 0.5 * this->len) < (searchmin[0] - hdiff))
continue;
if((this->center[0] - 0.5 * this->len) > (searchmax[0] + hdiff))
continue;
if((this->center[1] + 0.5 * this->len) < (searchmin[1] - hdiff))
continue;
if((this->center[1] - 0.5 * this->len) > (searchmax[1] + hdiff))
continue;
if((this->center[2] + 0.5 * this->len) < (searchmin[2] - hdiff))
continue;
if((this->center[2] - 0.5 * this->len) > (searchmax[2] + hdiff))
continue;
#endif
no = this->u.d.nextnode; /* ok, we need to open the node */
}
}
*startnode = -1;
return numngb;
}
/*! This routine finds all neighbours `j' that can interact with the
* particle `i' in the communication buffer.
*
* Note that an interaction can take place if
* \f$ r_{ij} < h_i \f$ OR if \f$ r_{ij} < h_j \f$.
*
* In the range-search this is taken into account, i.e. it is guaranteed that
* all particles are found that fulfil this condition, including the (more
* difficult) second part of it. For this purpose, each node knows the
* maximum h occuring among the particles it represents.
*
* This function is similar to ngb_treefind_pairs but returns only
* pairs of same phase
*/
#ifdef MULTIPHASE
int ngb_treefind_phase_pairs(FLOAT searchcenter[3], FLOAT hsml, int phase, int *startnode)
{
int k, no, p, numngb;
FLOAT hdiff;
FLOAT searchmin[3], searchmax[3];
struct NODE *this;
#ifdef PERIODIC
double xtmp;
#endif
for(k = 0; k < 3; k++) /* cube-box window */
{
searchmin[k] = searchcenter[k] - hsml;
searchmax[k] = searchcenter[k] + hsml;
}
numngb = 0;
no = *startnode;
while(no >= 0)
{
if(no < All.MaxPart) /* single particle */
{
p = no;
no = Nextnode[no];
if(P[p].Type > 0)
continue;
/* here, we select all gas particles */
#ifdef MULTIPHASE
/* keep only particles of same phase */
if(SphP[p].Phase != phase)
continue;
#endif
hdiff = SphP[p].Hsml - hsml;
if(hdiff < 0)
hdiff = 0;
#ifdef PERIODIC
if(NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]) < (-hsml - hdiff))
continue;
if(NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]) > (hsml + hdiff))
continue;
if(NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]) < (-hsml - hdiff))
continue;
if(NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]) > (hsml + hdiff))
continue;
if(NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]) < (-hsml - hdiff))
continue;
if(NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]) > (hsml + hdiff))
continue;
#else
if(P[p].Pos[0] < (searchmin[0] - hdiff))
continue;
if(P[p].Pos[0] > (searchmax[0] + hdiff))
continue;
if(P[p].Pos[1] < (searchmin[1] - hdiff))
continue;
if(P[p].Pos[1] > (searchmax[1] + hdiff))
continue;
if(P[p].Pos[2] < (searchmin[2] - hdiff))
continue;
if(P[p].Pos[2] > (searchmax[2] + hdiff))
continue;
#endif
Ngblist[numngb++] = p;
if(numngb == MAX_NGB)
{
printf
("ThisTask=%d: Need to do a second neighbour loop in hydro-force for (%g|%g|%g) hsml=%g no=%d\n",
ThisTask, searchcenter[0], searchcenter[1], searchcenter[2], hsml, no);
*startnode = no;
return numngb;
}
}
else
{
if(no >= All.MaxPart + MaxNodes) /* pseudo particle */
{
Exportflag[DomainTask[no - (All.MaxPart + MaxNodes)]] = 1;
no = Nextnode[no - MaxNodes];
continue;
}
this = &Nodes[no];
hdiff = Extnodes[no].hmax - hsml;
if(hdiff < 0)
hdiff = 0;
no = this->u.d.sibling; /* in case the node can be discarded */
#ifdef PERIODIC
if((NGB_PERIODIC_X(this->center[0] - searchcenter[0]) + 0.5 * this->len) < (-hsml - hdiff))
continue;
if((NGB_PERIODIC_X(this->center[0] - searchcenter[0]) - 0.5 * this->len) > (hsml + hdiff))
continue;
if((NGB_PERIODIC_Y(this->center[1] - searchcenter[1]) + 0.5 * this->len) < (-hsml - hdiff))
continue;
if((NGB_PERIODIC_Y(this->center[1] - searchcenter[1]) - 0.5 * this->len) > (hsml + hdiff))
continue;
if((NGB_PERIODIC_Z(this->center[2] - searchcenter[2]) + 0.5 * this->len) < (-hsml - hdiff))
continue;
if((NGB_PERIODIC_Z(this->center[2] - searchcenter[2]) - 0.5 * this->len) > (hsml + hdiff))
continue;
#else
if((this->center[0] + 0.5 * this->len) < (searchmin[0] - hdiff))
continue;
if((this->center[0] - 0.5 * this->len) > (searchmax[0] + hdiff))
continue;
if((this->center[1] + 0.5 * this->len) < (searchmin[1] - hdiff))
continue;
if((this->center[1] - 0.5 * this->len) > (searchmax[1] + hdiff))
continue;
if((this->center[2] + 0.5 * this->len) < (searchmin[2] - hdiff))
continue;
if((this->center[2] - 0.5 * this->len) > (searchmax[2] + hdiff))
continue;
#endif
no = this->u.d.nextnode; /* ok, we need to open the node */
}
}
*startnode = -1;
return numngb;
}
#endif
/*! This function returns neighbours with distance <= hsml and returns them in
* Ngblist. Actually, particles in a box of half side length hsml are
* returned, i.e. the reduction to a sphere still needs to be done in the
* calling routine.
*/
int ngb_treefind_variable(FLOAT searchcenter[3], FLOAT hsml, int phase, int *startnode)
{
int k, numngb;
int no, p;
struct NODE *this;
FLOAT searchmin[3], searchmax[3];
#ifdef PERIODIC
double xtmp;
#endif
for(k = 0; k < 3; k++) /* cube-box window */
{
searchmin[k] = searchcenter[k] - hsml;
searchmax[k] = searchcenter[k] + hsml;
}
numngb = 0;
no = *startnode;
while(no >= 0)
{
if(no < All.MaxPart) /* single particle */
{
p = no;
no = Nextnode[no];
if(P[p].Type > 0)
continue;
#ifdef MULTIPHASE
/* GAS_SPH sees only GAS_SPH */
if((phase == GAS_SPH) && (SphP[p].Phase != GAS_SPH))
continue;
/* GAS_SPH sees only GAS_STICKY (better for sticky interaction) */
if((phase == GAS_STICKY) && (SphP[p].Phase != GAS_STICKY))
continue;
/* GAS_DARK sees everybody */
#endif
#ifdef PERIODIC
if(NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]) < -hsml)
continue;
if(NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]) > hsml)
continue;
if(NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]) < -hsml)
continue;
if(NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]) > hsml)
continue;
if(NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]) < -hsml)
continue;
if(NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]) > hsml)
continue;
#else
if(P[p].Pos[0] < searchmin[0])
continue;
if(P[p].Pos[0] > searchmax[0])
continue;
if(P[p].Pos[1] < searchmin[1])
continue;
if(P[p].Pos[1] > searchmax[1])
continue;
if(P[p].Pos[2] < searchmin[2])
continue;
if(P[p].Pos[2] > searchmax[2])
continue;
#endif
Ngblist[numngb++] = p;
if(numngb == MAX_NGB)
{
numngb = ngb_clear_buf(searchcenter, hsml, numngb);
if(numngb == MAX_NGB)
{
printf("ThisTask=%d: Need to do a second neighbour loop for (%g|%g|%g) hsml=%g no=%d\n",
ThisTask, searchcenter[0], searchcenter[1], searchcenter[2], hsml, no);
*startnode = no;
return numngb;
}
}
}
else
{
if(no >= All.MaxPart + MaxNodes) /* pseudo particle */
{
Exportflag[DomainTask[no - (All.MaxPart + MaxNodes)]] = 1;
no = Nextnode[no - MaxNodes];
continue;
}
this = &Nodes[no];
no = this->u.d.sibling; /* in case the node can be discarded */
#ifdef PERIODIC
if((NGB_PERIODIC_X(this->center[0] - searchcenter[0]) + 0.5 * this->len) < -hsml)
continue;
if((NGB_PERIODIC_X(this->center[0] - searchcenter[0]) - 0.5 * this->len) > hsml)
continue;
if((NGB_PERIODIC_Y(this->center[1] - searchcenter[1]) + 0.5 * this->len) < -hsml)
continue;
if((NGB_PERIODIC_Y(this->center[1] - searchcenter[1]) - 0.5 * this->len) > hsml)
continue;
if((NGB_PERIODIC_Z(this->center[2] - searchcenter[2]) + 0.5 * this->len) < -hsml)
continue;
if((NGB_PERIODIC_Z(this->center[2] - searchcenter[2]) - 0.5 * this->len) > hsml)
continue;
#else
if((this->center[0] + 0.5 * this->len) < (searchmin[0]))
continue;
if((this->center[0] - 0.5 * this->len) > (searchmax[0]))
continue;
if((this->center[1] + 0.5 * this->len) < (searchmin[1]))
continue;
if((this->center[1] - 0.5 * this->len) > (searchmax[1]))
continue;
if((this->center[2] + 0.5 * this->len) < (searchmin[2]))
continue;
if((this->center[2] - 0.5 * this->len) > (searchmax[2]))
continue;
#endif
no = this->u.d.nextnode; /* ok, we need to open the node */
}
}
*startnode = -1;
return numngb;
}
#ifdef CHIMIE
/*! This function returns neighbours with distance <= hsml and returns them in
* Ngblist. Actually, particles in a box of half side length hsml are
* returned, i.e. the reduction to a sphere still needs to be done in the
* calling routine.
*/
int ngb_treefind_variable_for_chimie(FLOAT searchcenter[3], FLOAT hsml, int *startnode)
{
int k, numngb;
int no, p;
struct NODE *this;
FLOAT searchmin[3], searchmax[3];
#ifdef PERIODIC
double xtmp;
#endif
for(k = 0; k < 3; k++) /* cube-box window */
{
searchmin[k] = searchcenter[k] - hsml;
searchmax[k] = searchcenter[k] + hsml;
}
numngb = 0;
no = *startnode;
while(no >= 0)
{
if(no < All.MaxPart) /* single particle */
{
p = no;
no = Nextnode[no];
if(P[p].Type > 0)
continue;
#ifdef CHIMIE_KINETIC_FEEDBACK /* no, we need to keep all particles, especially when the wind is low */
// if (SphP[p].WindTime >= (All.Time-All.ChimieWindTime))
// continue;
#endif
#ifdef PERIODIC
if(NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]) < -hsml)
continue;
if(NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]) > hsml)
continue;
if(NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]) < -hsml)
continue;
if(NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]) > hsml)
continue;
if(NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]) < -hsml)
continue;
if(NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]) > hsml)
continue;
#else
if(P[p].Pos[0] < searchmin[0])
continue;
if(P[p].Pos[0] > searchmax[0])
continue;
if(P[p].Pos[1] < searchmin[1])
continue;
if(P[p].Pos[1] > searchmax[1])
continue;
if(P[p].Pos[2] < searchmin[2])
continue;
if(P[p].Pos[2] > searchmax[2])
continue;
#endif
Ngblist[numngb++] = p;
if(numngb == MAX_NGB)
{
numngb = ngb_clear_buf(searchcenter, hsml, numngb);
if(numngb == MAX_NGB)
{
printf("ThisTask=%d: Need to do a second neighbour loop for (%g|%g|%g) hsml=%g no=%d\n",
ThisTask, searchcenter[0], searchcenter[1], searchcenter[2], hsml, no);
*startnode = no;
return numngb;
}
}
}
else
{
if(no >= All.MaxPart + MaxNodes) /* pseudo particle */
{
Exportflag[DomainTask[no - (All.MaxPart + MaxNodes)]] = 1;
no = Nextnode[no - MaxNodes];
continue;
}
this = &Nodes[no];
no = this->u.d.sibling; /* in case the node can be discarded */
#ifdef PERIODIC
if((NGB_PERIODIC_X(this->center[0] - searchcenter[0]) + 0.5 * this->len) < -hsml)
continue;
if((NGB_PERIODIC_X(this->center[0] - searchcenter[0]) - 0.5 * this->len) > hsml)
continue;
if((NGB_PERIODIC_Y(this->center[1] - searchcenter[1]) + 0.5 * this->len) < -hsml)
continue;
if((NGB_PERIODIC_Y(this->center[1] - searchcenter[1]) - 0.5 * this->len) > hsml)
continue;
if((NGB_PERIODIC_Z(this->center[2] - searchcenter[2]) + 0.5 * this->len) < -hsml)
continue;
if((NGB_PERIODIC_Z(this->center[2] - searchcenter[2]) - 0.5 * this->len) > hsml)
continue;
#else
if((this->center[0] + 0.5 * this->len) < (searchmin[0]))
continue;
if((this->center[0] - 0.5 * this->len) > (searchmax[0]))
continue;
if((this->center[1] + 0.5 * this->len) < (searchmin[1]))
continue;
if((this->center[1] - 0.5 * this->len) > (searchmax[1]))
continue;
if((this->center[2] + 0.5 * this->len) < (searchmin[2]))
continue;
if((this->center[2] - 0.5 * this->len) > (searchmax[2]))
continue;
#endif
no = this->u.d.nextnode; /* ok, we need to open the node */
}
}
*startnode = -1;
return numngb;
}
#endif
/*! This function returns the first particle that may sticky-interact with
* the given particle, in the sph kernel.
*/
#ifdef MULTIPHASE
int ngb_treefind_sticky_collisions(FLOAT searchcenter[3], FLOAT hsml, int phase, int *startnode)
{
int k, numngb;
int no, p;
struct NODE *this;
FLOAT searchmin[3], searchmax[3];
double dx,dy,dz,dr2;
#ifdef PERIODIC
double xtmp;
#endif
for(k = 0; k < 3; k++) /* cube-box window */
{
searchmin[k] = searchcenter[k] - hsml;
searchmax[k] = searchcenter[k] + hsml;
}
numngb = 0;
no = *startnode;
while(no >= 0)
{
if(no < All.MaxPart) /* single particle */
{
p = no;
no = Nextnode[no];
if((P[p].Type > 0) || (SphP[p].Phase!=GAS_STICKY)) /* keep only GAS_STICKY */
continue;
if(SphP[p].StickyFlag==0) /* the particle may not collide */
continue;
#ifdef PERIODIC
if(NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]) < -hsml)
continue;
if(NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]) > hsml)
continue;
if(NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]) < -hsml)
continue;
if(NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]) > hsml)
continue;
if(NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]) < -hsml)
continue;
if(NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]) > hsml)
continue;
#else
if(P[p].Pos[0] < searchmin[0])
continue;
if(P[p].Pos[0] > searchmax[0])
continue;
if(P[p].Pos[1] < searchmin[1])
continue;
if(P[p].Pos[1] > searchmax[1])
continue;
if(P[p].Pos[2] < searchmin[2])
continue;
if(P[p].Pos[2] > searchmax[2])
continue;
#endif
dx = searchcenter[0] - P[p].Pos[0];
dy = searchcenter[1] - P[p].Pos[1];
dz = searchcenter[2] - P[p].Pos[2];
dr2= dx * dx + dy * dy + dz * dz;
if (dr2>hsml*hsml)
continue;
if (dr2==0)
continue;
return p;
}
else
{
if(no >= All.MaxPart + MaxNodes) /* pseudo particle */
{
/* here, we do nothing */
no = Nextnode[no - MaxNodes];
continue;
}
this = &Nodes[no];
no = this->u.d.sibling; /* in case the node can be discarded */
#ifdef PERIODIC
if((NGB_PERIODIC_X(this->center[0] - searchcenter[0]) + 0.5 * this->len) < -hsml)
continue;
if((NGB_PERIODIC_X(this->center[0] - searchcenter[0]) - 0.5 * this->len) > hsml)
continue;
if((NGB_PERIODIC_Y(this->center[1] - searchcenter[1]) + 0.5 * this->len) < -hsml)
continue;
if((NGB_PERIODIC_Y(this->center[1] - searchcenter[1]) - 0.5 * this->len) > hsml)
continue;
if((NGB_PERIODIC_Z(this->center[2] - searchcenter[2]) + 0.5 * this->len) < -hsml)
continue;
if((NGB_PERIODIC_Z(this->center[2] - searchcenter[2]) - 0.5 * this->len) > hsml)
continue;
#else
if((this->center[0] + 0.5 * this->len) < (searchmin[0]))
continue;
if((this->center[0] - 0.5 * this->len) > (searchmax[0]))
continue;
if((this->center[1] + 0.5 * this->len) < (searchmin[1]))
continue;
if((this->center[1] - 0.5 * this->len) > (searchmax[1]))
continue;
if((this->center[2] + 0.5 * this->len) < (searchmin[2]))
continue;
if((this->center[2] - 0.5 * this->len) > (searchmax[2]))
continue;
#endif
no = this->u.d.nextnode; /* ok, we need to open the node */
}
}
return -1;
}
#endif
#ifdef TESSEL
#define NGB_PERIODIC_FLAG_X(x) (xtmp=(x),(xtmp>boxHalf_X)?(1):((xtmp<-boxHalf_X)?(1):0))
#define NGB_PERIODIC_FLAG_Y(x) (xtmp=(x),(xtmp>boxHalf_Y)?(1):((xtmp<-boxHalf_Y)?(1):0))
#define NGB_PERIODIC_FLAG_Z(x) (xtmp=(x),(xtmp>boxHalf_Z)?(1):((xtmp<-boxHalf_Z)?(1):0))
/*! This function returns neighbours with distance <= hsml and returns them in
* Ngblist. Actually, particles in a box of half side length hsml are
* returned, i.e. the reduction to a sphere still needs to be done in the
* calling routine.
*
*
*/
int ngb_treefind_variable_for_tessel(FLOAT searchcenter[3], FLOAT hsml, int phase, int *startnode)
{
int k, numngb;
int no, p;
struct NODE *this;
FLOAT searchmin[3], searchmax[3];
int flag;
#ifdef PERIODIC
double xtmp;
#endif
for(k = 0; k < 3; k++) /* cube-box window */
{
searchmin[k] = searchcenter[k] - hsml;
searchmax[k] = searchcenter[k] + hsml;
}
numngb = 0;
no = *startnode;
while(no >= 0)
{
if(no < All.MaxPart) /* single particle */
{
p = no;
no = Nextnode[no];
if(P[p].Type > 0)
continue;
//if(P[p].IsAdded) /* the point has already be added by another point, skip it */
// continue;
#ifdef MULTIPHASE
/* GAS_SPH sees only GAS_SPH */
if((phase == GAS_SPH) && (SphP[p].Phase != GAS_SPH))
continue;
/* GAS_SPH sees only GAS_STICKY (better for sticky interaction) */
if((phase == GAS_STICKY) && (SphP[p].Phase != GAS_STICKY))
continue;
/* GAS_DARK sees everybody */
#endif
#ifdef PERIODIC
if(NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]) < -hsml)
continue;
if(NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]) > hsml)
continue;
if(NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]) < -hsml)
continue;
if(NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]) > hsml)
continue;
if(NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]) < -hsml)
continue;
if(NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]) > hsml)
continue;
#else
if(P[p].Pos[0] < searchmin[0])
continue;
if(P[p].Pos[0] > searchmax[0])
continue;
if(P[p].Pos[1] < searchmin[1])
continue;
if(P[p].Pos[1] > searchmax[1])
continue;
if(P[p].Pos[2] < searchmin[2])
continue;
if(P[p].Pos[2] > searchmax[2])
continue;
#endif
/* the particle is inside the search radius */
#ifdef PERIODIC
/* keep it only if the particle is in the radius due to periodicity */
flag = 0; /* !!! here, we should stop once flag=1 */
flag += (NGB_PERIODIC_FLAG_X(P[p].Pos[0] - searchcenter[0]));
flag += (NGB_PERIODIC_FLAG_X(P[p].Pos[0] - searchcenter[0]));
flag += (NGB_PERIODIC_FLAG_Y(P[p].Pos[1] - searchcenter[1]));
flag += (NGB_PERIODIC_FLAG_Y(P[p].Pos[1] - searchcenter[1]));
flag += (NGB_PERIODIC_FLAG_Z(P[p].Pos[2] - searchcenter[2]));
flag += (NGB_PERIODIC_FLAG_Z(P[p].Pos[2] - searchcenter[2]));
if (flag==0)
continue;
#endif
Ngblist[numngb++] = p;
if(numngb == MAX_NGB)
{
numngb = ngb_clear_buf(searchcenter, hsml, numngb);
if(numngb == MAX_NGB)
{
printf("ThisTask=%d: Need to do a second neighbour loop for (%g|%g|%g) hsml=%g no=%d\n",
ThisTask, searchcenter[0], searchcenter[1], searchcenter[2], hsml, no);
*startnode = no;
return numngb;
}
}
}
else
{
if(no >= All.MaxPart + MaxNodes) /* pseudo particle */
{
Exportflag[DomainTask[no - (All.MaxPart + MaxNodes)]] = 1;
no = Nextnode[no - MaxNodes];
continue;
}
this = &Nodes[no];
no = this->u.d.sibling; /* in case the node can be discarded */
#ifdef PERIODIC
if((NGB_PERIODIC_X(this->center[0] - searchcenter[0]) + 0.5 * this->len) < -hsml)
continue;
if((NGB_PERIODIC_X(this->center[0] - searchcenter[0]) - 0.5 * this->len) > hsml)
continue;
if((NGB_PERIODIC_Y(this->center[1] - searchcenter[1]) + 0.5 * this->len) < -hsml)
continue;
if((NGB_PERIODIC_Y(this->center[1] - searchcenter[1]) - 0.5 * this->len) > hsml)
continue;
if((NGB_PERIODIC_Z(this->center[2] - searchcenter[2]) + 0.5 * this->len) < -hsml)
continue;
if((NGB_PERIODIC_Z(this->center[2] - searchcenter[2]) - 0.5 * this->len) > hsml)
continue;
#else
if((this->center[0] + 0.5 * this->len) < (searchmin[0]))
continue;
if((this->center[0] - 0.5 * this->len) > (searchmax[0]))
continue;
if((this->center[1] + 0.5 * this->len) < (searchmin[1]))
continue;
if((this->center[1] - 0.5 * this->len) > (searchmax[1]))
continue;
if((this->center[2] + 0.5 * this->len) < (searchmin[2]))
continue;
if((this->center[2] - 0.5 * this->len) > (searchmax[2]))
continue;
#endif
no = this->u.d.nextnode; /* ok, we need to open the node */
}
}
*startnode = -1;
return numngb;
}
#endif /* TESSEL */
/*! The buffer for the neighbour list has a finite length MAX_NGB. For a large
* search region, this buffer can get full, in which case this routine can be
* called to eliminate some of the superfluous particles in the "corners" of
* the search box - only the ones in the inscribed sphere need to be kept.
*/
int ngb_clear_buf(FLOAT searchcenter[3], FLOAT hsml, int numngb)
{
int i, p;
FLOAT dx, dy, dz, r2;
#ifdef PERIODIC
double xtmp;
#endif
for(i = 0; i < numngb; i++)
{
p = Ngblist[i];
#ifdef PERIODIC
dx = NGB_PERIODIC_X(P[p].Pos[0] - searchcenter[0]);
dy = NGB_PERIODIC_Y(P[p].Pos[1] - searchcenter[1]);
dz = NGB_PERIODIC_Z(P[p].Pos[2] - searchcenter[2]);
#else
dx = P[p].Pos[0] - searchcenter[0];
dy = P[p].Pos[1] - searchcenter[1];
dz = P[p].Pos[2] - searchcenter[2];
#endif
r2 = dx * dx + dy * dy + dz * dz;
if(r2 > hsml * hsml)
{
Ngblist[i] = Ngblist[numngb - 1];
i--;
numngb--;
}
}
return numngb;
}
/*! Allocates memory for the neighbour list buffer.
*/
void ngb_treeallocate(int npart)
{
double totbytes = 0;
size_t bytes;
#ifdef PERIODIC
boxSize = All.BoxSize;
boxHalf = 0.5 * All.BoxSize;
#ifdef LONG_X
boxHalf_X = boxHalf * LONG_X;
boxSize_X = boxSize * LONG_X;
#endif
#ifdef LONG_Y
boxHalf_Y = boxHalf * LONG_Y;
boxSize_Y = boxSize * LONG_Y;
#endif
#ifdef LONG_Z
boxHalf_Z = boxHalf * LONG_Z;
boxSize_Z = boxSize * LONG_Z;
#endif
#endif
if(!(Ngblist = malloc(bytes = npart * (long) sizeof(int))))
{
printf("Failed to allocate %g MB for ngblist array\n", bytes / (1024.0 * 1024.0));
endrun(78);
}
totbytes += bytes;
if(ThisTask == 0)
printf("allocated %g Mbyte for ngb search.\n", totbytes / (1024.0 * 1024.0));
}
/*! free memory allocated for neighbour list buffer.
*/
void ngb_treefree(void)
{
free(Ngblist);
}
/*! This function constructs the neighbour tree. To this end, we actually need
* to construct the gravitational tree, because we use it now for the
* neighbour search.
*/
void ngb_treebuild(void)
{
if(ThisTask == 0)
printf("Begin Ngb-tree construction.\n");
#if defined(STELLAR_PROP) && defined(CHIMIE) && !defined(CHIMIE_INPUT_ALL)
force_treebuild(N_gas+N_stars);
#else
force_treebuild(N_gas);
#endif
if(ThisTask == 0)
printf("Ngb-Tree contruction finished \n");
}

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