AUTHOR=Menaca Rafael , Silva Mickael , Uddeen Kalim , Almatrafi Fahad , Tang Qinglong , Turner James W. G. , Im Hong G. TITLE=Optical multi-spark ammonia combustion engine: numerical analysis and validation JOURNAL=Frontiers in Mechanical Engineering VOLUME=11 YEAR=2025 URL=https://www.frontiersin.org/journals/mechanical-engineering/articles/10.3389/fmech.2025.1478081 DOI=10.3389/fmech.2025.1478081 ISSN=2297-3079