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The increasing interest in hydrogen as a sustainable fuel for internal combustion engines (ICEs) necessitates a deep understanding of mixture formation and flow dynamics within the combustion chamber. This study employs computational fluid dynamics (CFD) simulations to investigate the behaviour of an air-hydrogen mixture as it flows through the intake valve system and interacts with the piston crown geometry. The research evaluates how different piston designs influence turbulence intensity, fuel-air mixing quality, and overall combustion efficiency. Key parameters, such as in-cylinder flow structures, velocity distribution, and local equivalence ratios, are analysed to assess their impact on hydrogen combustion stability and efficiency. The study also addresses backfire risk and mixture stratification challenges, providing insights into optimising engine design for hydrogen-fuelled ICEs. The findings contribute to developing advanced piston geometries and intake strategies that enhance performance and reduce emissions in hydrogen-powered internal combustion engines.