# Intro

This example is an idealised galaxy with a geasous disk, a stellar bulge and disc. The dark matter halo is model using a external Hernquist potential. This example allows the use of sink particles for star formation.

# Configure

To run this example with GEAR model,

```
./configure --with-ext-potential=hernquist --with-chemistry=GEAR_10 --with-cooling=grackle_0 --with-stars=GEAR --with-star-formation=GEAR --with-feedback=GEAR --with-sink=GEAR --with-kernel=wendland-C2 --with-adaptive-softening --with-grackle=path/to/grackle
```

and then

`make -j`

You can remove the adaptive softening. In this case, you may need to change the default `max_physical_baryon_softening` value.

Other sink models can be probed by changing swift configuration and adding the relevant parameters in params.yml.

# ICs

The run.sh script can download the initial conditions at different resolutions by changing `filename=...`. Do not forget to update the name in isolated_galaxy.yml.

# Run

Type `run.sh`, and let's go!

# Changing the cooling

You can change grackle mode to 1,2, or 3 if you want. You may also want to change the simulation end time.