/*! This routine computes the accelerations for all active particles.
* First, the long-range PM force is computed if the TreePM algorithm is
* used and a "big" PM step is done. Next, the gravitational tree forces
* are computed. This also constructs the tree, if needed.
*
* If gas particles are present, the density-loop for active SPH particles
* is carried out. This includes an iteration on the correct number of
* neighbours. Finally, the hydrodynamical forces are added.
*/
void compute_accelerations(int mode)
{
double tstart, tend;
if(ThisTask == 0)
{
printf("Start force computation...\n");
fflush(stdout);
}
#ifdef PMGRID
if(All.PM_Ti_endstep == All.Ti_Current)
{
tstart = second();
long_range_force();
tend = second();
All.CPU_PM += timediff(tstart, tend);
}
#endif
tstart = second(); /* measure the time for the full force computation */
gravity_tree(); /* computes gravity accel. */
if(All.TypeOfOpeningCriterion == 1 && All.Ti_Current == 0)
gravity_tree(); /* For the first timestep, we redo it
* to allow usage of relative opening
* criterion for consistent accuracy.
*/
tend = second();
All.CPU_Gravity += timediff(tstart, tend);
#ifdef FORCETEST
gravity_forcetest();
#endif
if(All.TotN_gas > 0)
{
if(ThisTask == 0)
{
printf("Start density computation...\n");
fflush(stdout);
}
tstart = second();
density(); /* computes density, and pressure */
tend = second();
All.CPU_Hydro += timediff(tstart, tend);
tstart = second();
force_update_hmax(); /* tell the tree nodes the new SPH smoothing length such that they are guaranteed to hold the correct max(Hsml) */
tend = second();
All.CPU_Predict += timediff(tstart, tend);
if(ThisTask == 0)
{
printf("Start hydro-force computation...\n");
fflush(stdout);
}
tstart = second();
hydro_force(); /* adds hydrodynamical accelerations and computes viscous entropy injection */
tend = second();
All.CPU_Hydro += timediff(tstart, tend);
}
if(ThisTask == 0)
{
printf("force computation done.\n");
fflush(stdout);
}
}
/*! This routine computes the accelerations for all active particles.
* First, the long-range PM force is computed if the TreePM algorithm is
* used and a "big" PM step is done. Next, the gravitational tree forces
* are computed. This also constructs the tree, if needed.
*
* If gas particles are present, the density-loop for active SPH particles
* is carried out. This includes an iteration on the correct number of
* neighbours. Finally, the hydrodynamical forces are added.
*/
void compute_accelerations(int mode)
{
double tstart, tend;
#ifdef SURFACE
int i;
double dt_entr;
#endif
if(ThisTask == 0)
{
printf("Start force computation...\n");
fflush(stdout);
}
#ifdef PMGRID
if(All.PM_Ti_endstep == All.Ti_Current)
{
tstart = second();
long_range_force();
tend = second();
All.CPU_PM += timediff(tstart, tend);
}
#endif
tstart = second(); /* measure the time for the full force computation */
#if defined TWODIMS || defined SURFACE
//Make sure we have a currentish estimate of the centre of mass and the energy of the particles
//Needs to happen before gravity if we're going to smooth using H which depends on the entropy
if(All.Ti_Current ==0)
{
density();
compute_global_quantities_of_system();
}
#endif
#ifdef DEAD_GAS
if(All.Ti_Current ==0)
compute_global_quantities_of_system();
kill_gas();
#endif
gravity_tree(); /* computes gravity accel. */
if(All.TypeOfOpeningCriterion == 1 && All.Ti_Current == 0)
{
#ifdef DEAD_GAS
kill_gas();
#endif
gravity_tree(); /* For the first timestep, we redo it
* to allow usage of relative opening
* criterion for consistent accuracy.
*/
}
tend = second();
All.CPU_Gravity += timediff(tstart, tend);
#ifdef FORCETEST
gravity_forcetest();
#endif
#ifdef DIRTY_SHAMEFUL_SECRET
if(NumPart-N_gas){
P[N_gas].GravAccel[0]=0;
P[N_gas].GravAccel[1]=0;
P[N_gas].GravAccel[2]=0;
}
#endif
if(All.TotN_gas > 0)
{
if(ThisTask == 0)
{
printf("Start density computation...\n");
fflush(stdout);
}
#ifdef SURFACE
double tot,bigtot;
//Want to do it after density, so we have accurate density values for calculating energy
sur_density();
//Pre update value
tot=0;
for(i=0;i<N_gas;i++)
{
dt_entr = (All.Ti_Current - .5*(P[i].Ti_endstep+P[i].Ti_begstep)) * All.Timebase_interval;
dt_entr = 0;
tot += P[i].Mass * (SphP[i].Entropy+dt_entr*SphP[i].DtEntropy)*pow(SphP[i].Density,GAMMA_MINUS1) / GAMMA_MINUS1;
}
MPI_Allreduce(&tot,&bigtot,1,MPI_DOUBLE,MPI_SUM,MPI_COMM_WORLD);
if(ThisTask==0)
printf("Pre update total energy = %g.\n",bigtot);
//What is the total energy, pre spread
for(i=0;i<N_gas;i++)
{
if(P[i].Ti_endstep == All.Ti_Current)
{
//Set the pressure to the new value
//SphP[i].Pressure = SphP[i].SurEntropy * pow(SphP[i].Density,GAMMA);
//Set the entropy such that K+dK*dt = K required for current internal energy
//dt_entr = (All.Ti_Current - .5*(P[i].Ti_endstep+P[i].Ti_begstep)) * All.Timebase_interval;
SphP[i].Entropy = (SphP[i].SurEntropy * GAMMA_MINUS1) / pow(SphP[i].Density,GAMMA_MINUS1);// - SphP[i].DtEntropy*dt_entr;
}
}
//Post update value
tot=0;
for(i=0;i<N_gas;i++)
{
dt_entr = (All.Ti_Current - .5*(P[i].Ti_endstep+P[i].Ti_begstep)) * All.Timebase_interval;
dt_entr = 0;
tot += P[i].Mass * (SphP[i].Entropy+dt_entr*SphP[i].DtEntropy)*pow(SphP[i].Density,GAMMA_MINUS1) / GAMMA_MINUS1;
}
MPI_Allreduce(&tot,&bigtot,1,MPI_DOUBLE,MPI_SUM,MPI_COMM_WORLD);
if(ThisTask==0)
printf("Post update total energy = %g.\n",bigtot);
#endif
tstart = second();
density(); /* computes density, and pressure */
tend = second();
All.CPU_Hydro += timediff(tstart, tend);
tstart = second();
force_update_hmax(); /* tell the tree nodes the new SPH smoothing length such that they are guaranteed to hold the correct max(Hsml) */
tend = second();
All.CPU_Predict += timediff(tstart, tend);
if(ThisTask == 0)
{
printf("Start hydro-force computation...\n");
fflush(stdout);
}
tstart = second();
#ifdef DEAD_GAS
kill_gas();
#endif
hydro_force(); /* adds hydrodynamical accelerations and computes viscous entropy injection */
//int i;
//for(i=0;i<N_gas;i++)
// SphP[i].HydroAccel[0] = SphP[i].HydroAccel[1] =SphP[i].HydroAccel[2]=0;
#ifdef DEAD_GAS
ressurect();
#endif
tend = second();
All.CPU_Hydro += timediff(tstart, tend);
}
if(ThisTask == 0)
{
printf("force computation done.\n");
fflush(stdout);
}
}