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Commit 520d3f95 authored by Matthieu Schaller's avatar Matthieu Schaller
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Move the drifting of the entropy to be like Gadget-3

parent 34776816
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src/cell.c
View file @ 520d3f95
......@@ -686,9 +686,10 @@ void cell_sanitize(struct cell *c) {
void cell_convert_hydro(struct cell *c, void *data) {
struct part *p = c->parts;
struct xpart *xp = c->xparts;
for (int i = 0; i < c->count; ++i) {
hydro_convert_quantities(&p[i]);
hydro_convert_quantities(&p[i], &xp[i]);
}
}
......
src/hydro/Gadget2/hydro.h
View file @ 520d3f95
......@@ -48,7 +48,7 @@
__attribute__((always_inline)) INLINE static float hydro_get_internal_energy(
const struct part *restrict p, float dt) {
const float entropy = p->entropy + p->entropy_dt * dt;
const float entropy = p->entropy + dt * p->entropy_dt;
return gas_internal_energy_from_entropy(p->rho, entropy);
}
......@@ -62,7 +62,7 @@ __attribute__((always_inline)) INLINE static float hydro_get_internal_energy(
__attribute__((always_inline)) INLINE static float hydro_get_pressure(
const struct part *restrict p, float dt) {
const float entropy = p->entropy + p->entropy_dt * dt;
const float entropy = p->entropy + dt * p->entropy_dt;
return gas_pressure_from_entropy(p->rho, entropy);
}
......@@ -76,7 +76,7 @@ __attribute__((always_inline)) INLINE static float hydro_get_pressure(
__attribute__((always_inline)) INLINE static float hydro_get_entropy(
const struct part *restrict p, float dt) {
return p->entropy + p->entropy_dt * dt;
return p->entropy + dt * p->entropy_dt;
}
/**
......@@ -216,6 +216,7 @@ __attribute__((always_inline)) INLINE static void hydro_first_init_part(
xp->v_full[0] = p->v[0];
xp->v_full[1] = p->v[1];
xp->v_full[2] = p->v[2];
xp->entropy_full = p->entropy;
}
/**
......@@ -228,9 +229,10 @@ __attribute__((always_inline)) INLINE static void hydro_first_init_part(
*/
__attribute__((always_inline)) INLINE static void hydro_init_part(
struct part *restrict p) {
p->rho = 0.f;
p->density.wcount = 0.f;
p->density.wcount_dh = 0.f;
p->rho = 0.f;
p->density.rho_dh = 0.f;
p->density.div_v = 0.f;
p->density.rot_v[0] = 0.f;
......@@ -302,11 +304,7 @@ __attribute__((always_inline)) INLINE static void hydro_prepare_force(
const float abs_div_v = fabsf(p->density.div_v);
/* Compute the pressure */
const integertime_t ti_begin =
get_integer_time_begin(ti_current, p->time_bin);
const integertime_t ti_end = get_integer_time_end(ti_current, p->time_bin);
const float half_dt = (ti_current - (ti_begin + ti_end) / 2) * timeBase;
const float pressure = hydro_get_pressure(p, half_dt);
const float pressure = gas_pressure_from_entropy(p->rho, p->entropy);
/* Compute the sound speed */
const float soundspeed = gas_soundspeed_from_pressure(p->rho, pressure);
......@@ -368,6 +366,9 @@ __attribute__((always_inline)) INLINE static void hydro_reset_predicted_values(
p->v[0] = xp->v_full[0];
p->v[1] = xp->v_full[1];
p->v[2] = xp->v_full[2];
/* Re-set the entropy */
p->entropy = xp->entropy_full;
}
/**
......@@ -400,11 +401,11 @@ __attribute__((always_inline)) INLINE static void hydro_predict_extra(
else
p->rho *= expf(w2);
/* Drift the pressure */
const integertime_t ti_begin = get_integer_time_begin(t0, p->time_bin);
const integertime_t ti_end = get_integer_time_end(t0, p->time_bin);
const float dt_entr = (t1 - (ti_begin + ti_end) / 2) * timeBase;
const float pressure = hydro_get_pressure(p, dt_entr);
/* Predict the entropy */
p->entropy += p->entropy_dt * dt;
/* Re-compute the pressure */
const float pressure = gas_pressure_from_entropy(p->rho, p->entropy);
/* Compute the new sound speed */
const float soundspeed = gas_soundspeed_from_pressure(p->rho, pressure);
......@@ -446,13 +447,13 @@ __attribute__((always_inline)) INLINE static void hydro_kick_extra(
/* Do not decrease the entropy (temperature) by more than a factor of 2*/
const float entropy_change = p->entropy_dt * dt;
if (entropy_change > -0.5f * p->entropy)
p->entropy += entropy_change;
if (entropy_change > -0.5f * xp->entropy_full)
xp->entropy_full += entropy_change;
else
p->entropy *= 0.5f;
xp->entropy_full *= 0.5f;
/* Compute the pressure */
const float pressure = gas_pressure_from_entropy(p->rho, p->entropy);
const float pressure = gas_pressure_from_entropy(p->rho, xp->entropy_full);
/* Compute the new sound speed */
const float soundspeed = gas_soundspeed_from_pressure(p->rho, pressure);
......@@ -473,10 +474,11 @@ __attribute__((always_inline)) INLINE static void hydro_kick_extra(
* @param p The particle to act upon
*/
__attribute__((always_inline)) INLINE static void hydro_convert_quantities(
struct part *restrict p) {
struct part *restrict p, struct xpart *restrict xp) {
/* We read u in the entropy field. We now get S from u */
p->entropy = gas_entropy_from_internal_energy(p->rho, p->entropy);
xp->entropy_full = gas_entropy_from_internal_energy(p->rho, p->entropy);
p->entropy = xp->entropy_full;
/* Compute the pressure */
const float pressure = gas_pressure_from_entropy(p->rho, p->entropy);
......
src/hydro/Gadget2/hydro_part.h
View file @ 520d3f95
......@@ -42,6 +42,9 @@ struct xpart {
/* Velocity at the last full step. */
float v_full[3];
/* Entropy at the last full step. */
float entropy_full;
/* Additional data used to record cooling information */
struct cooling_xpart_data cooling_data;
......
src/statistics.c
View file @ 520d3f95
......@@ -104,8 +104,8 @@ void stats_collect_part_mapper(void *map_data, int nr_parts, void *extra_data) {
const struct part *restrict parts = (struct part *)map_data;
const struct xpart *restrict xparts =
s->xparts + (ptrdiff_t)(parts - s->parts);
// const integertime_t ti_current = s->e->ti_current;
// const double timeBase = s->e->timeBase;
const integertime_t ti_current = s->e->ti_current;
const double timeBase = s->e->timeBase;
const double time = s->e->time;
struct statistics *const global_stats = data->stats;
......@@ -125,32 +125,27 @@ void stats_collect_part_mapper(void *map_data, int nr_parts, void *extra_data) {
const struct xpart *xp = &xparts[k];
const struct gpart *gp = (p->gpart != NULL) ? gp = p->gpart : NULL;
/* Get useful variables */
// const integertime_t ti_begin =
// get_integer_time_begin(ti_current, p->time_bin);
// const integertime_t ti_end = get_integer_time_end(ti_current,
// p->time_bin);
// const integertime_t dti = get_integer_timestep(p->time_bin);
const float dt =
0.f; //(ti_current - (ti_begin + ti_end) / 2) * timeBase; //MATTHIEU
const double x[3] = {p->x[0], p->x[1], p->x[2]};
/* Get useful time variables */
const integertime_t ti_begin =
get_integer_time_begin(ti_current, p->time_bin);
const integertime_t ti_step = get_integer_timestep(p->time_bin);
const float dt = (ti_current - (ti_begin + ti_step / 2)) * timeBase;
/* Get the total acceleration */
float a_tot[3] = {p->a_hydro[0], p->a_hydro[1], p->a_hydro[2]};
if (gp != NULL) {
a_tot[0] += gp->a_grav[0];
a_tot[1] += gp->a_grav[1];
a_tot[2] += gp->a_grav[2];
}
/* Extrapolate velocities to current time */
const float v[3] = {xp->v_full[0] + a_tot[0] * dt,
xp->v_full[1] + a_tot[1] * dt,
xp->v_full[2] + a_tot[2] * dt};
const float m = hydro_get_mass(p);
/* if (p->id == ICHECK) */
/* message("bin=%d dti=%lld ti_begin=%lld ti_end=%lld dt=%e v=[%e %e %e]",
*/
/* p->time_bin, dti, ti_begin, ti_end, */
/* dt, v[0], v[1], v[2]); */
const double x[3] = {p->x[0], p->x[1], p->x[2]};
/* Collect mass */
stats.mass += m;
......@@ -167,13 +162,12 @@ void stats_collect_part_mapper(void *map_data, int nr_parts, void *extra_data) {
/* Collect energies. */
stats.E_kin += 0.5f * m * (v[0] * v[0] + v[1] * v[1] + v[2] * v[2]);
stats.E_int += m * hydro_get_internal_energy(p, dt);
stats.E_rad += cooling_get_radiated_energy(xp);
stats.E_pot_self += 0.f;
if (gp != NULL)
stats.E_pot_ext += m * external_gravity_get_potential_energy(
time, potential, phys_const, gp);
stats.E_int += m * hydro_get_internal_energy(p, dt);
stats.E_rad += cooling_get_radiated_energy(xp);
/* Collect entropy */
stats.entropy += m * hydro_get_entropy(p, dt);
}
......
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