Getting Started

CosmicGrain is a seven-particle-type extension of GADGET-4 for explicit, on-the-fly dust evolution. A reliable first run has four prerequisites:

1. build GADGET-4 with NTYPES=7, IDS_64BIT, and the required dust, hydrodynamic, star-formation, feedback, and metals flags;
2. use an HDF5 initial condition whose header arrays have seven entries and whose empty PartType6 group is valid;
3. provide every required runtime dust and feedback parameter; and
4. verify the parsed [DUST_FLAGS] summary before evolving the simulation.

Use these pages in order:

• Installation — libraries and source tree
• Compilation — compile flags and build verification
• Quick Start — short startup smoke test
• First Simulation — staged validation run
• Zoom Setup — current 12-halo MUSIC2 suite
• HPC Systems — machine-specific considerations

The accepted production IC suite contains 12 halos at four resolution levels. All 48 files passed the independent IC-suite validation checklist.