Nature, Published online: 19 August 2026; doi:10. 1038/s41586-026-10917-6 HydroGym offers over 60 standardized reinforcement-learning flow-control environments and demonstrates zero-shot transfer to a 3D wing, cutting local skin friction by 38% and exploration costs by four orders of magnitude.
Source: [Nature](https://www.nature.com/articles/s41586-026-10917-6)