Blackholes swallowing - Gas case

examples/EAGLE_low_z/EAGLE_12/eagle_12.yml

@@ -30,6 +30,9 @@ Snapshots:
   delta_time:          1.01  # Time difference between consecutive outputs (in internal units)
   compression:         1
 
+Scheduler:
+  links_per_tasks: 500
+
 # Parameters governing the conserved quantities statistics
 Statistics:
   scale_factor_first:  0.92 # Scale-factor of the first stat dump (cosmological run)

examples/EAGLE_low_z/EAGLE_25/eagle_25.yml

@@ -22,7 +22,10 @@ Cosmology:
   Omega_m:        0.307         # Matter density parameter
   Omega_lambda:   0.693         # Dark-energy density parameter
   Omega_b:        0.0455        # Baryon density parameter
-  
+
+Scheduler:
+  links_per_tasks: 500
+
 # Parameters governing the time integration
 TimeIntegration:
   time_begin: 0.    # The starting time of the simulation (in internal units).

examples/EAGLE_low_z/EAGLE_6/eagle_6.yml

@@ -25,6 +25,7 @@ Cosmology:
   
 Scheduler:
   max_top_level_cells:    8
+  links_per_tasks: 500
   
 # Parameters governing the time integration
 TimeIntegration:

examples/SubgridTests/BlackHoleSwallowing/check_masses.py

+import h5py as h5
+import numpy as np
+
+
+f = h5.File("bh_swallowing_serial_0001.hdf5", "r")
+f_mpi = h5.File("bh_swallowing_mpi_0001.hdf5", "r")
+f_ics = h5.File("bh_swallowing.hdf5", "r")
+
+m = np.array(f["/PartType5/Masses"])#[:]
+m_mpi = np.array(f_mpi["/PartType5/Masses"])#[:]
+m_ics = np.array(f_ics["/PartType5/Masses"])#[:]
+
+ids = np.array(f["/PartType5/ParticleIDs"])#[:]
+ids_mpi = np.array(f_mpi["/PartType5/ParticleIDs"])#[:]
+ids_ics = np.array(f_ics["/PartType5/ParticleIDs"])#[:]
+
+rank = np.argsort(ids)
+rank_mpi = np.argsort(ids_mpi)
+rank_ics = np.argsort(ids_ics)
+
+m = m[rank]
+m_mpi = m_mpi[rank_mpi]
+m_ics = m_ics[rank_ics]
+
+ids = ids[rank]
+ids_mpi = ids_mpi[rank_mpi]
+ids_ics = ids_ics[rank_ics]
+
+
+# Check
+#print ids - ids_mpi
+#print ids - ids_ics
+
+count_wrong = 0
+
+print "ID -- ICs mass -- serial mass -- MPI mass"
+for i in range(np.size(ids)):
+    print "%14d %5f %5f %5f"%(ids[i], m_ics[i], m[i], m_mpi[i]),
+    
+    if m[i] > m_ics[i] * 1.1:
+        print "#",
+    else:
+        print " ",
+    
+    if m[i] != m_mpi[i]:
+        count_wrong += 1
+        print " <---"
+    else:
+        print ""
+
+print "Found", count_wrong, "wrong BH masses."
+
+
+ids_gas_mpi = f_mpi["/PartType0/ParticleIDs"][:]
+ids_removed_mpi = np.loadtxt("list_mpi.txt")
+
+for i in range(np.size(ids_removed_mpi)):
+    result = np.where(ids_gas_mpi == ids_removed_mpi)
+    print result
+
+
+ids_gas = f["/PartType0/ParticleIDs"][:]
+ids_removed = np.loadtxt("list.txt")
+
+for i in range(np.size(ids_removed)):
+    result = np.where(ids_gas == ids_removed)
+    print result
+
+#rho_gas = f["/PartType0/Density"][:]
+#print np.mean(rho_gas), np.std(rho_gas)

examples/SubgridTests/BlackHoleSwallowing/getGlass.sh

+#!/bin/bash
+wget http://virgodb.cosma.dur.ac.uk/swift-webstorage/ICs/glassCube_32.hdf5

examples/SubgridTests/BlackHoleSwallowing/makeIC.py

+###############################################################################
+ # This file is part of SWIFT.
+ # Copyright (c) 2016 Matthieu Schaller (matthieu.schaller@durham.ac.uk)
+ # 
+ # This program is free software: you can redistribute it and/or modify
+ # it under the terms of the GNU Lesser General Public License as published
+ # by the Free Software Foundation, either version 3 of the License, or
+ # (at your option) any later version.
+ # 
+ # This program is distributed in the hope that it will be useful,
+ # but WITHOUT ANY WARRANTY; without even the implied warranty of
+ # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ # GNU General Public License for more details.
+ # 
+ # You should have received a copy of the GNU Lesser General Public License
+ # along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ # 
+ ##############################################################################
+
+import h5py
+from numpy import *
+
+# Some constants
+solar_mass_cgs = 1.988480e33 
+kpc_in_cm = 3.085678e21
+mp_cgs = 1.67e-24
+boltzmann_k_cgs = 1.38e-16
+
+# Parameters
+gamma = 5./3.      				# Gas adiabatic index
+rho_cgs = mp_cgs        			# Background density
+u0_cgs = 1.2e12					# Desired initial internal energy (1.2e12 ~ 10^4K)
+P_cgs = rho_cgs*u0_cgs*(gamma - 1.)          	# Background pressure
+fileName = "bh_swallowing.hdf5" 
+
+# Units
+unit_l_cgs = 3.085678e24  # kpc
+unit_m_cgs = 1.988480e43  # 10^10 Msun
+unit_v_cgs = 1e5          # km / s
+unit_A_cgs = 1.
+unit_T_cgs = 1.
+unit_t_cgs = unit_l_cgs / unit_v_cgs
+
+boxsize_cgs = 10. * kpc_in_cm
+vol_cgs = boxsize_cgs**3
+
+#---------------------------------------------------
+glass = h5py.File("glassCube_32.hdf5", "r")
+
+# Read particle positions and h from the glass
+pos = glass["/PartType0/Coordinates"][:,:]
+eps = 1e-6
+pos = (pos - pos.min()) / (pos.max() - pos.min() + eps) * boxsize_cgs / unit_l_cgs
+h = glass["/PartType0/SmoothingLength"][:] * boxsize_cgs / unit_l_cgs
+
+numPart = size(h)
+
+# Generate extra arrays
+v = zeros((numPart, 3))
+ids = linspace(1, numPart, numPart)
+m_cgs = zeros(numPart)
+u_cgs = zeros(numPart)
+m = zeros(numPart)
+u = zeros(numPart)
+
+m_cgs[:] = rho_cgs * vol_cgs / numPart    
+u_cgs[:] = P_cgs / (rho_cgs * (gamma - 1))
+
+# BHs
+bh_pos = zeros((2, 3))
+bh_pos[0,:] = 0.5 * boxsize_cgs / unit_l_cgs
+
+#diff = [4.812127e-03, 4.908179e-03, -4.878537e-03] - bh_pos[0,:]
+
+#print diff
+
+bh_pos[1,:] = 0.5 * boxsize_cgs / unit_l_cgs + diff
+
+print bh_pos
+
+# BHs don't move
+bh_v = zeros((2, 3))
+bh_v[:,:] = 0.
+
+# increase mass to keep it at center
+bh_m_cgs = ones(2) * m_cgs[0]
+bh_ids = linspace(numPart + 1, numPart + 2, 2, dtype='L')
+bh_h = ones(2) * [h.max()]
+
+print bh_ids
+
+#--------------------------------------------------
+
+# Check quantities are correct for debugging
+print("boxsize kpc " + str(boxsize_cgs/kpc_in_cm))
+print("density cm^-3 " + str(rho_cgs/mp_cgs))
+print("initial temperature K " + str(u_cgs[0] / boltzmann_k_cgs*((gamma - 1)*rho_cgs)))
+
+# Convert to internal units
+bh_m = bh_m_cgs/unit_m_cgs
+m[:] = m_cgs/unit_m_cgs
+u[:] = u_cgs*unit_v_cgs**-2
+boxsize = boxsize_cgs/unit_l_cgs
+
+
+#--------------------------------------------------
+
+#File
+file = h5py.File(fileName, 'w')
+
+# Header
+grp = file.create_group("/Header")
+grp.attrs["BoxSize"] = [boxsize]*3
+grp.attrs["NumPart_Total"] =  [numPart, 0, 0, 0, 0, 2]
+#grp.attrs["NumPart_Total"] =  [numPart, 0, 0, 0, 0, 0]
+grp.attrs["NumPart_Total_HighWord"] = [0, 0, 0, 0, 0, 0]
+grp.attrs["NumPart_ThisFile"] = [numPart, 0, 0, 0, 0, 2]
+#grp.attrs["NumPart_ThisFile"] = [numPart, 0, 0, 0, 0, 0]
+grp.attrs["Time"] = 0.0
+grp.attrs["NumFilesPerSnapshot"] = 1
+grp.attrs["MassTable"] = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
+grp.attrs["Flag_Entropy_ICs"] = 0
+grp.attrs["Dimension"] = 3
+
+#Runtime parameters
+grp = file.create_group("/RuntimePars")
+grp.attrs["PeriodicBoundariesOn"] = 0
+
+#Units
+grp = file.create_group("/Units")
+grp.attrs["Unit length in cgs (U_L)"] = unit_l_cgs
+grp.attrs["Unit mass in cgs (U_M)"] = unit_m_cgs
+grp.attrs["Unit time in cgs (U_t)"] = unit_t_cgs
+grp.attrs["Unit current in cgs (U_I)"] = unit_A_cgs
+grp.attrs["Unit temperature in cgs (U_T)"] = unit_T_cgs
+
+#Particle group
+grp = file.create_group("/PartType0")
+grp.create_dataset('Coordinates', data=pos, dtype='d')
+grp.create_dataset('Velocities', data=v, dtype='f')
+grp.create_dataset('Masses', data=m, dtype='f')
+grp.create_dataset('SmoothingLength', data=h, dtype='f')
+grp.create_dataset('InternalEnergy', data=u, dtype='f')
+grp.create_dataset('ParticleIDs', data=ids, dtype='L')
+
+# stellar group
+grp = file.create_group("/PartType5")
+grp.create_dataset("Coordinates", (2,3),data=bh_pos, dtype="d")
+grp.create_dataset('Velocities', (2,3),data=bh_v, dtype='f')
+grp.create_dataset('Masses', (2,1),data=bh_m, dtype='f')
+grp.create_dataset('SmoothingLength', (2,1),data=bh_h, dtype='f')
+grp.create_dataset('ParticleIDs', (2,1),data=bh_ids[::-1], dtype='L')
+
+file.close()

examples/SubgridTests/BlackHoleSwallowing/swallowing.yml

+# Define the system of units to use internally. 
+InternalUnitSystem:
+  UnitMass_in_cgs:     1.98848e43    # 10^10 M_sun in grams
+  UnitLength_in_cgs:   3.08567758e24 # Mpc in centimeters
+  UnitVelocity_in_cgs: 1e5           # km/s in centimeters per second
+  UnitCurrent_in_cgs:  1.            # Amperes
+  UnitTemp_in_cgs:     1.            # Kelvin
+
+# Cosmological parameters
+Cosmology:
+  h:              0.6777        # Reduced Hubble constant
+  a_begin:        0.5           # Initial scale-factor of the simulation
+  a_end:          1.0           # Final scale factor of the simulation
+  Omega_m:        0.307         # Matter density parameter
+  Omega_lambda:   0.693         # Dark-energy density parameter
+  Omega_b:        0.0455        # Baryon density parameter
+
+# Parameters governing the time integration
+TimeIntegration:
+  time_begin: 0      # The starting time of the simulation (in internal units).
+  time_end:   1.3e-2 # The end time of the simulation (in internal units).
+  dt_min:     1e-10  # The minimal time-step size of the simulation (in internal units).
+  dt_max:     1e-5   # The maximal time-step size of the simulation (in internal units).
+
+# Parameters governing the snapshots
+Snapshots:
+  basename:            bh_swallowing_serial # Common part of the name of output files
+  time_first:          0.            # Time of the first output (in internal units)
+  delta_time:          3.e-5         # Time difference between consecutive outputs without cosmology (internal units)
+  compression:         1
+
+# Parameters governing the conserved quantities statistics
+Statistics:
+  time_first:          0.
+  delta_time:          1.e-5  # non cosmology time between statistics output
+
+# Parameters for the hydrodynamics scheme
+SPH:
+  resolution_eta:        1.2348   # Target smoothing length in units of the mean inter-particle separation 
+  CFL_condition:         0.1      # Courant-Friedrich-Levy condition for time integration.
+  minimal_temperature:   10.      # Kelvin
+
+# Parameters related to the initial conditions
+InitialConditions:
+  file_name:  ./bh_swallowing.hdf5       # The file to read
+  periodic:   1
+  
+Scheduler:
+  max_top_level_cells: 8
+  tasks_per_cell:      500			
+
+# Parameters for the EAGLE "equation of state"
+EAGLEEntropyFloor:
+  Jeans_density_threshold_H_p_cm3: 0.1       # Physical density above which the EAGLE Jeans limiter entropy floor kicks in expressed in Hydrogen atoms per cm^3.
+  Jeans_over_density_threshold:    10.       # Overdensity above which the EAGLE Jeans limiter entropy floor can kick in.
+  Jeans_temperature_norm_K:        8000      # Temperature of the EAGLE Jeans limiter entropy floor at the density threshold expressed in Kelvin.
+  Jeans_gamma_effective:           1.3333333 # Slope the of the EAGLE Jeans limiter entropy floor
+  Cool_density_threshold_H_p_cm3: 1e-5       # Physical density above which the EAGLE Cool limiter entropy floor kicks in expressed in Hydrogen atoms per cm^3.
+  Cool_over_density_threshold:    10.        # Overdensity above which the EAGLE Cool limiter entropy floor can kick in.
+  Cool_temperature_norm_K:        8000       # Temperature of the EAGLE Cool limiter entropy floor at the density threshold expressed in Kelvin.
+  Cool_gamma_effective:           1.         # Slope the of the EAGLE Cool limiter entropy floor
+
+# Metallicites read in for the gas and star
+EAGLEChemistry:              
+  init_abundance_metal:      0.01
+  init_abundance_Hydrogen:   0.752
+  init_abundance_Helium:     0.248
+  init_abundance_Carbon:     0.0
+  init_abundance_Nitrogen:   0.0
+  init_abundance_Oxygen:     0.0
+  init_abundance_Neon:       0.0
+  init_abundance_Magnesium:  0.0
+  init_abundance_Silicon:    0.0
+  init_abundance_Iron:       0.0
+
+# Standard EAGLE cooling options
+EAGLECooling:
+  dir_name:                ./coolingtables/  # Location of the Wiersma+08 cooling tables
+  H_reion_z:               11.5              # Redshift of Hydrogen re-ionization
+  H_reion_eV_p_H:          2.0
+  He_reion_z_centre:       3.5               # Redshift of the centre of the Helium re-ionization Gaussian
+  He_reion_z_sigma:        0.5               # Spread in redshift of the  Helium re-ionization Gaussian
+  He_reion_eV_p_H:         2.0               # Energy inject by Helium re-ionization in electron-volt per Hydrogen atom
+
+# EAGLE AGN model
+EAGLEAGN:
+  subgrid_seed_mass_Msun:           1.5e5      # Black hole subgrid mass at creation time in solar masses.
+  max_eddington_fraction:           1.         # Maximal allowed accretion rate in units of the Eddington rate.
+  radiative_efficiency:             0.1        # Fraction of the accreted mass that gets radiated.
+  coupling_efficiency:              0.15       # Fraction of the radiated energy that couples to the gas in feedback events.
+  AGN_delta_T_K:                    3.16228e8  # Change in temperature to apply to the gas particle in an AGN feedback event in Kelvin.
+  AGN_num_ngb_to_heat:              1.         # Target number of gas neighbours to heat in an AGN feedback event.

examples/SubgridTests/BlackHoleSwallowing/swallowing_mpi.yml

+# Define the system of units to use internally. 
+InternalUnitSystem:
+  UnitMass_in_cgs:     1.98848e43    # 10^10 M_sun in grams
+  UnitLength_in_cgs:   3.08567758e24 # Mpc in centimeters
+  UnitVelocity_in_cgs: 1e5           # km/s in centimeters per second
+  UnitCurrent_in_cgs:  1.            # Amperes
+  UnitTemp_in_cgs:     1.            # Kelvin
+
+# Cosmological parameters
+Cosmology:
+  h:              0.6777        # Reduced Hubble constant
+  a_begin:        0.5           # Initial scale-factor of the simulation
+  a_end:          1.0           # Final scale factor of the simulation
+  Omega_m:        0.307         # Matter density parameter
+  Omega_lambda:   0.693         # Dark-energy density parameter
+  Omega_b:        0.0455        # Baryon density parameter
+
+# Parameters governing the time integration
+TimeIntegration:
+  time_begin: 0      # The starting time of the simulation (in internal units).
+  time_end:   1.3e-2 # The end time of the simulation (in internal units).
+  dt_min:     1e-10  # The minimal time-step size of the simulation (in internal units).
+  dt_max:     1e-5   # The maximal time-step size of the simulation (in internal units).
+
+# Parameters governing the snapshots
+Snapshots:
+  basename:            bh_swallowing_mpi # Common part of the name of output files
+  time_first:          0.            # Time of the first output (in internal units)
+  delta_time:          3.e-5         # Time difference between consecutive outputs without cosmology (internal units)
+  compression:         1
+
+# Parameters governing the conserved quantities statistics
+Statistics:
+  time_first:          0.
+  delta_time:          1.e-5  # non cosmology time between statistics output
+
+# Parameters for the hydrodynamics scheme
+SPH:
+  resolution_eta:        1.2348   # Target smoothing length in units of the mean inter-particle separation 
+  CFL_condition:         0.1      # Courant-Friedrich-Levy condition for time integration.
+  minimal_temperature:   10.      # Kelvin
+
+# Parameters related to the initial conditions
+InitialConditions:
+  file_name:  ./bh_swallowing.hdf5       # The file to read
+  periodic:   1
+  
+Scheduler:
+  max_top_level_cells: 8
+  tasks_per_cell:      500			
+
+# Parameters for the EAGLE "equation of state"
+EAGLEEntropyFloor:
+  Jeans_density_threshold_H_p_cm3: 0.1       # Physical density above which the EAGLE Jeans limiter entropy floor kicks in expressed in Hydrogen atoms per cm^3.
+  Jeans_over_density_threshold:    10.       # Overdensity above which the EAGLE Jeans limiter entropy floor can kick in.
+  Jeans_temperature_norm_K:        8000      # Temperature of the EAGLE Jeans limiter entropy floor at the density threshold expressed in Kelvin.
+  Jeans_gamma_effective:           1.3333333 # Slope the of the EAGLE Jeans limiter entropy floor
+  Cool_density_threshold_H_p_cm3: 1e-5       # Physical density above which the EAGLE Cool limiter entropy floor kicks in expressed in Hydrogen atoms per cm^3.
+  Cool_over_density_threshold:    10.        # Overdensity above which the EAGLE Cool limiter entropy floor can kick in.
+  Cool_temperature_norm_K:        8000       # Temperature of the EAGLE Cool limiter entropy floor at the density threshold expressed in Kelvin.
+  Cool_gamma_effective:           1.         # Slope the of the EAGLE Cool limiter entropy floor
+
+# Metallicites read in for the gas and star
+EAGLEChemistry:              
+  init_abundance_metal:      0.01
+  init_abundance_Hydrogen:   0.752
+  init_abundance_Helium:     0.248
+  init_abundance_Carbon:     0.0
+  init_abundance_Nitrogen:   0.0
+  init_abundance_Oxygen:     0.0
+  init_abundance_Neon:       0.0
+  init_abundance_Magnesium:  0.0
+  init_abundance_Silicon:    0.0
+  init_abundance_Iron:       0.0
+
+# Standard EAGLE cooling options
+EAGLECooling:
+  dir_name:                ./coolingtables/  # Location of the Wiersma+08 cooling tables
+  H_reion_z:               11.5              # Redshift of Hydrogen re-ionization
+  H_reion_eV_p_H:          2.0
+  He_reion_z_centre:       3.5               # Redshift of the centre of the Helium re-ionization Gaussian
+  He_reion_z_sigma:        0.5               # Spread in redshift of the  Helium re-ionization Gaussian
+  He_reion_eV_p_H:         2.0               # Energy inject by Helium re-ionization in electron-volt per Hydrogen atom
+
+# EAGLE AGN model
+EAGLEAGN:
+  subgrid_seed_mass_Msun:           1.5e5      # Black hole subgrid mass at creation time in solar masses.
+  max_eddington_fraction:           1.         # Maximal allowed accretion rate in units of the Eddington rate.
+  radiative_efficiency:             0.1        # Fraction of the accreted mass that gets radiated.
+  coupling_efficiency:              0.15       # Fraction of the radiated energy that couples to the gas in feedback events.
+  AGN_delta_T_K:                    3.16228e8  # Change in temperature to apply to the gas particle in an AGN feedback event in Kelvin.
+  AGN_num_ngb_to_heat:              1.         # Target number of gas neighbours to heat in an AGN feedback event.

src/Makefile.am

@@ -53,7 +53,7 @@ include_HEADERS = space.h runner.h queue.h task.h lock.h cell.h part.h const.h \
     star_formation_struct.h star_formation.h star_formation_iact.h \
     star_formation_logger.h star_formation_logger_struct.h \
     velociraptor_struct.h velociraptor_io.h random.h memuse.h black_holes.h black_holes_io.h \
-    black_holes_properties.h feedback.h feedback_struct.h feedback_properties.h
+    black_holes_properties.h black_holes_struct.h feedback.h feedback_struct.h feedback_properties.h
 
 # source files for EAGLE cooling
 EAGLE_COOLING_SOURCES =
@@ -218,6 +218,7 @@ nobase_noinst_HEADERS = align.h approx_math.h atomic.h barrier.h cycle.h error.h
                  black_holes/Default/black_holes.h black_holes/Default/black_holes_io.h \
 		 black_holes/Default/black_holes_part.h black_holes/Default/black_holes_iact.h \
                  black_holes/Default/black_holes_properties.h \
+                 black_holes/Default/black_holes_struct.h \
                  black_holes/EAGLE/black_holes.h black_holes/EAGLE/black_holes_io.h \
 		 black_holes/EAGLE/black_holes_part.h black_holes/EAGLE/black_holes_iact.h \
                  black_holes/EAGLE/black_holes_properties.h 

src/black_holes/Default/black_holes.h

@@ -23,6 +23,7 @@
 
 /* Local includes */
 #include "black_holes_properties.h"
+#include "black_holes_struct.h"
 #include "dimension.h"
 #include "kernel_hydro.h"
 #include "minmax.h"
@@ -139,6 +140,58 @@ black_holes_bpart_has_no_neighbours(struct bpart* restrict bp,
   bp->density.wcount_dh = 0.f;
 }
 
+/**
+ * @brief Update the properties of a black hole particles by swallowing
+ * a gas particle.
+ *
+ * @param bp The #bpart to update.
+ * @param p The #part that is swallowed.
+ * @param xp The #xpart that is swallowed.
+ * @param cosmo The current cosmological model.
+ */
+__attribute__((always_inline)) INLINE static void black_holes_swallow_part(
+    struct bpart* bp, const struct part* p, const struct xpart* xp,
+    const struct cosmology* cosmo) {
+
+  /* Nothing to do here: No swallowing in the default model */
+}
+
+/**
+ * @brief Update a given #part's BH data field to mark the particle has
+ * not yet been swallowed.
+ *
+ * @param p_data The #part's #black_holes_part_data structure.
+ */
+__attribute__((always_inline)) INLINE static void
+black_holes_mark_as_not_swallowed(struct black_holes_part_data* p_data) {
+
+  /* Nothing to do here: No swallowing in the default model */
+}
+
+/**
+ * @brief Update a given #part's BH data field to mark the particle has
+ * having been been swallowed.
+ *
+ * @param p_data The #part's #black_holes_part_data structure.
+ */
+__attribute__((always_inline)) INLINE static void black_holes_mark_as_swallowed(
+    struct black_holes_part_data* p_data) {
+
+  /* Nothing to do here: No swallowing in the default model */
+}
+
+/**
+ * @brief Return the ID of the BH that should swallow this #part.
+ *
+ * @param p_data The #part's #black_holes_part_data structure.
+ */
+__attribute__((always_inline)) INLINE static long long
+black_holes_get_swallow_id(struct black_holes_part_data* p_data) {
+
+  /* Return a non-existing ID */
+  return -1;
+}
+
 /**
  * @brief Compute the accretion rate of the black hole and all the quantites
  * required for the feedback loop.

src/black_holes/Default/black_holes_iact.h

@@ -63,6 +63,28 @@ __attribute__((always_inline)) INLINE static void runner_iact_nonsym_bh_density(
 #endif
 }
 
+/**
+ * @brief Swallowing interaction between two particles (non-symmetric).
+ *
+ * Function used to flag the gas particles that will be swallowed
+ * by the black hole particle.
+ *
+ * @param r2 Comoving square distance between the two particles.
+ * @param dx Comoving vector separating both particles (pi - pj).
+ * @param hi Comoving smoothing-length of particle i.
+ * @param hj Comoving smoothing-length of particle j.
+ * @param bi First particle (black hole).
+ * @param pj Second particle (gas)
+ * @param xpj The extended data of the second particle.
+ * @param cosmo The cosmological model.
+ * @param ti_current Current integer time value (for random numbers).
+ */
+__attribute__((always_inline)) INLINE static void runner_iact_nonsym_bh_swallow(
+    const float r2, const float *dx, const float hi, const float hj,
+    struct bpart *restrict bi, struct part *restrict pj,
+    struct xpart *restrict xpj, const struct cosmology *cosmo,
+    const integertime_t ti_current) {}
+
 /**
  * @brief Feedback interaction between two particles (non-symmetric).
  *

src/black_holes/Default/black_holes_part.h

@@ -19,8 +19,7 @@
 #ifndef SWIFT_DEFAULT_BLACK_HOLE_PART_H
 #define SWIFT_DEFAULT_BLACK_HOLE_PART_H
 
-/* Some standard headers. */
-#include <stdlib.h>
+#include "chemistry_struct.h"
 
 /**
  * @brief Particle fields for the black hole particles.
@@ -63,6 +62,10 @@ struct bpart {
 
   } density;
 
+  /*! Chemistry information (e.g. metal content at birth, swallowed metal
+   * content, etc.) */
+  struct chemistry_bpart_data chemistry_data;
+
 #ifdef SWIFT_DEBUG_CHECKS
 
   /* Time of the last drift */

src/black_holes/Default/black_holes_struct.h

+/*******************************************************************************
+ * This file is part of SWIFT.
+ * Copyright (c) 2019 Matthieu Schaller (schaller@strw.leidenuniv.nl)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for