AUTHOR=Zhou Ling , Zhang Yuquan , Tan Lei , Li Xiaojun , Kim Jin-Hyuk , Agarwal Ramesh K. TITLE=Editorial: Design, simulation and optimization of hydraulic machinery, volume II JOURNAL=Frontiers in Energy Research VOLUME=11 YEAR=2023 URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2023.1216513 DOI=10.3389/fenrg.2023.1216513 ISSN=2296-598X