A black-hole particle does AGN feedback (heating) in the box of 
homogeneous density (1 H_part/cm^3) with ~32^3 gas particles. 

The example is run for 50 Myr and it generates 202 snapshots.

You may play with the following AGN feedback parameters:
-- coupling_efficiency 
-- AGN_delta_T_K
-- AGN_num_ngb_to_heat
-- AGN_stochastic
-- AGN_feedback_model

After running the example you will get an AGN_feedback_statistics.pdf
file containing the detailed information about the AGN feedback.

You can also see what exactly the black hole is doing by running the 
visualiser script black_hole_visualise.py. The script needs one parameter 
which is the number of the snapshot it is applied to.

You may generate a sequence of snapshots' images by running:
"for i in {0..201}; do python3 black_hole_visualise.py $i ; done"

You can then make a movie using the following command:
"avconv -r 12 -i feedback_%04d.png -threads auto -qscale:v 0.1  movie.mp4"

The mass of the black-hole particle is 1e5 M_odot
The mass of the gas particles is 1e4 M_odot

The black hole initially resides in the centre of the box

The black hole swallowing is disabled. Instead, the black holes nibbles its gas neighbours
in small amounts.

Configuration options:
./configure --disable-hand-vec --with-subgrid=COLIBRE --with-kernel=wendland-C2 --with-hydro=sphenix --with-tbbmalloc