AUTHOR=Busch Stephen TITLE=Editorial: Design and Application of Novel Combustion Systems for Internal Combustion Engines JOURNAL=Frontiers in Mechanical Engineering VOLUME=7 YEAR=2021 URL=https://www.frontiersin.org/journals/mechanical-engineering/articles/10.3389/fmech.2021.676196 DOI=10.3389/fmech.2021.676196 ISSN=2297-3079