AUTHOR=Zhou Ling , Kim Jin-Hyuk , Tan Lei , Li Xiaojun TITLE=Editorial: Design, simulation and optimization of hydraulic machinery JOURNAL=Frontiers in Energy Research VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.971870 DOI=10.3389/fenrg.2022.971870 ISSN=2296-598X