AUTHOR=Yang Yang , Ji Leilei , Agarwal Ramesh K. , Kan Kan , Tao Ran , Presas Alexandre TITLE=Editorial: Optimal design and efficiency improvement of fluid machinery and systems: volume III JOURNAL=Frontiers in Energy Research VOLUME=13 YEAR=2025 URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2025.1532293 DOI=10.3389/fenrg.2025.1532293 ISSN=2296-598X