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global.c
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global.c
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#include <mpi.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "allvars.h"
#include "proto.h"
/* This routine computes various global properties of the particle
* distribution and stores the result in the struct `SysState'.
* Currently, not all the information that's computed here is
* actually used (e.g. momentum is not really used anywhere),
* just the energies are written to a log-file every once in a while.
*/
/*
* This file was originally part of the GADGET3 code developed by
* Volker Springel (volker.springel@h-its.org). The code has been modified
* somewhat by Phil Hopkins (phopkins@caltech.edu) for GIZMO.
*/
void compute_global_quantities_of_system(void)
{
int i, j, n, dt_step;
struct state_of_system sys;
double a1, a2, a3;
double entr = 0, egyspec, vel[3];
double dt_entr, dt_gravkick, dt_hydrokick;
if(All.ComovingIntegrationOn)
{
a1 = All.Time;
a2 = All.Time * All.Time;
a3 = All.Time * All.Time * All.Time;
}
else
{
a1 = a2 = a3 = 1;
}
for(n = 0; n < 6; n++)
{
sys.MassComp[n] = sys.EnergyKinComp[n] = sys.EnergyPotComp[n] = sys.EnergyIntComp[n] = 0;
for(j = 0; j < 4; j++)
sys.CenterOfMassComp[n][j] = sys.MomentumComp[n][j] = sys.AngMomentumComp[n][j] = 0;
}
for(i = 0; i < NumPart; i++)
{
sys.MassComp[P[i].Type] += P[i].Mass;
#if defined(EVALPOTENTIAL) || defined(COMPUTE_POTENTIAL_ENERGY)
sys.EnergyPotComp[P[i].Type] += 0.5 * P[i].Mass * P[i].Potential / a1;
#endif
#ifndef WAKEUP
dt_step = P[i].TimeBin ? (((integertime) 1) << P[i].TimeBin) : 0;
#else
dt_step = P[i].dt_step;
#endif
if(All.ComovingIntegrationOn)
{
dt_entr = dt_hydrokick = (All.Ti_Current - (P[i].Ti_begstep + dt_step / 2)) * All.Timebase_interval / All.cf_hubble_a;
dt_gravkick = get_gravkick_factor(P[i].Ti_begstep, All.Ti_Current) -
get_gravkick_factor(P[i].Ti_begstep, P[i].Ti_begstep + dt_step / 2);
}
else
dt_entr = dt_gravkick = dt_hydrokick =
(All.Ti_Current - (P[i].Ti_begstep + dt_step / 2)) * All.Timebase_interval;
for(j = 0; j < 3; j++)
{
vel[j] = P[i].Vel[j] + P[i].GravAccel[j] * dt_gravkick;
if(P[i].Type == 0)
vel[j] += SphP[i].HydroAccel[j] * dt_hydrokick * All.cf_atime; /* convert from physical to code vel */
}
if(P[i].Type == 0)
{
entr = DMAX(0.5*SphP[i].InternalEnergy, SphP[i].InternalEnergy + SphP[i].DtInternalEnergy * dt_entr);
}
sys.EnergyKinComp[P[i].Type] +=
0.5 * P[i].Mass * (vel[0] * vel[0] + vel[1] * vel[1] + vel[2] * vel[2]) / a2;
if(P[i].Type == 0)
{
egyspec = entr;
sys.EnergyIntComp[0] += P[i].Mass * egyspec;
}
for(j = 0; j < 3; j++)
{
sys.MomentumComp[P[i].Type][j] += P[i].Mass * vel[j];
sys.CenterOfMassComp[P[i].Type][j] += P[i].Mass * P[i].Pos[j];
}
sys.AngMomentumComp[P[i].Type][0] += P[i].Mass * (P[i].Pos[1] * vel[2] - P[i].Pos[2] * vel[1]);
sys.AngMomentumComp[P[i].Type][1] += P[i].Mass * (P[i].Pos[2] * vel[0] - P[i].Pos[0] * vel[2]);
sys.AngMomentumComp[P[i].Type][2] += P[i].Mass * (P[i].Pos[0] * vel[1] - P[i].Pos[1] * vel[0]);
}
/* some the stuff over all processors */
MPI_Reduce(&sys.MassComp[0], &SysState.MassComp[0], 6, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
MPI_Reduce(&sys.EnergyPotComp[0], &SysState.EnergyPotComp[0], 6, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
MPI_Reduce(&sys.EnergyIntComp[0], &SysState.EnergyIntComp[0], 6, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
MPI_Reduce(&sys.EnergyKinComp[0], &SysState.EnergyKinComp[0], 6, MPI_DOUBLE, MPI_SUM, 0, MPI_COMM_WORLD);
MPI_Reduce(&sys.MomentumComp[0][0], &SysState.MomentumComp[0][0], 6 * 4, MPI_DOUBLE, MPI_SUM, 0,
MPI_COMM_WORLD);
MPI_Reduce(&sys.AngMomentumComp[0][0], &SysState.AngMomentumComp[0][0], 6 * 4, MPI_DOUBLE, MPI_SUM, 0,
MPI_COMM_WORLD);
MPI_Reduce(&sys.CenterOfMassComp[0][0], &SysState.CenterOfMassComp[0][0], 6 * 4, MPI_DOUBLE, MPI_SUM, 0,
MPI_COMM_WORLD);
if(ThisTask == 0)
{
for(i = 0; i < 6; i++)
SysState.EnergyTotComp[i] = SysState.EnergyKinComp[i] +
SysState.EnergyPotComp[i] + SysState.EnergyIntComp[i];
SysState.Mass = SysState.EnergyKin = SysState.EnergyPot = SysState.EnergyInt = SysState.EnergyTot = 0;
for(j = 0; j < 3; j++)
SysState.Momentum[j] = SysState.AngMomentum[j] = SysState.CenterOfMass[j] = 0;
for(i = 0; i < 6; i++)
{
SysState.Mass += SysState.MassComp[i];
SysState.EnergyKin += SysState.EnergyKinComp[i];
SysState.EnergyPot += SysState.EnergyPotComp[i];
SysState.EnergyInt += SysState.EnergyIntComp[i];
SysState.EnergyTot += SysState.EnergyTotComp[i];
for(j = 0; j < 3; j++)
{
SysState.Momentum[j] += SysState.MomentumComp[i][j];
SysState.AngMomentum[j] += SysState.AngMomentumComp[i][j];
SysState.CenterOfMass[j] += SysState.CenterOfMassComp[i][j];
}
}
for(i = 0; i < 6; i++)
for(j = 0; j < 3; j++)
if(SysState.MassComp[i] > 0)
SysState.CenterOfMassComp[i][j] /= SysState.MassComp[i];
for(j = 0; j < 3; j++)
if(SysState.Mass > 0)
SysState.CenterOfMass[j] /= SysState.Mass;
for(i = 0; i < 6; i++)
{
SysState.CenterOfMassComp[i][3] = SysState.MomentumComp[i][3] = SysState.AngMomentumComp[i][3] = 0;
for(j = 0; j < 3; j++)
{
SysState.CenterOfMassComp[i][3] +=
SysState.CenterOfMassComp[i][j] * SysState.CenterOfMassComp[i][j];
SysState.MomentumComp[i][3] += SysState.MomentumComp[i][j] * SysState.MomentumComp[i][j];
SysState.AngMomentumComp[i][3] +=
SysState.AngMomentumComp[i][j] * SysState.AngMomentumComp[i][j];
}
SysState.CenterOfMassComp[i][3] = sqrt(SysState.CenterOfMassComp[i][3]);
SysState.MomentumComp[i][3] = sqrt(SysState.MomentumComp[i][3]);
SysState.AngMomentumComp[i][3] = sqrt(SysState.AngMomentumComp[i][3]);
}
SysState.CenterOfMass[3] = SysState.Momentum[3] = SysState.AngMomentum[3] = 0;
for(j = 0; j < 3; j++)
{
SysState.CenterOfMass[3] += SysState.CenterOfMass[j] * SysState.CenterOfMass[j];
SysState.Momentum[3] += SysState.Momentum[j] * SysState.Momentum[j];
SysState.AngMomentum[3] += SysState.AngMomentum[j] * SysState.AngMomentum[j];
}
SysState.CenterOfMass[3] = sqrt(SysState.CenterOfMass[3]);
SysState.Momentum[3] = sqrt(SysState.Momentum[3]);
SysState.AngMomentum[3] = sqrt(SysState.AngMomentum[3]);
}
/* give everyone the result, maybe the want to do something with it */
MPI_Bcast(&SysState, sizeof(struct state_of_system), MPI_BYTE, 0, MPI_COMM_WORLD);
}