grackle

The Grackle chemistry and cooling library for astrophysical simulations and models.

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Grackle

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Grackle is a chemistry and radiative cooling library for astrophysical
simulations and models. Grackle has interfaces for C, C++, Fortran, and
Python codes and provides:

  • two options for primordial chemistry and cooling:

    1. non-equilibrium primordial chemistry network for atomic H, D, and He
      as well as H2 and HD, including H2 formation on dust grains.

    2. tabulated H and He cooling rates calculated with the photo-ionization
      code, Cloudy.

  • tabulated metal cooling rates calculated with Cloudy.

  • photo-heating and photo-ionization from two UV backgrounds with optional
    self-shielding corrections:

    1. Faucher-Giguere et al. (2009).

    2. Haardt & Madau (2012).

  • support for user-provided arrays of volumetric and specific heating rates.

The Grackle provides functions to update chemistry species; solve radiative
cooling and update internal energy; and calculate cooling time, temperature,
pressure, and ratio of specific heats (gamma).

For more information on features, installation, and integration with simulation
codes and models, see our online documentation.

Software that uses Grackle

A (non-exhaustive) list of software that provides out-of-the-box support for using Grackle includes:

We welcome PRs to add your simulation code to this list. We also welcome the inclusion of python modules that depend on Pygrackle.

Resources