An integrated computational fluid dynamics and chemical kinetics modeling for predicting oil degradation in maritime diesel engines

This manuscript presents an integrated approach combining chemical kinetics modeling with computational fluid dynamics (CFD) simulation to investigate oil degradation during the operation of a maritime diesel engine MTU 10V 2000 M72. Using COMSOL Multiphysics 6.2, a detailed 2D simulation was performed to model key engine components, including the main journal bearings, connecting rod journal bearings, piston, and oil pan. Three key parameters were analyzed: heat of combustion, crankshaft rotational speed, and oil flow rate. Results demonstrate that while heat of combustion has a moderate impact on oil lifespan, rotational speed significantly affects degradation due to its influence on temperature and flow conditions. The oil flow rate resulted as the most critical factor, with higher flow rates effectively reducing oil temperature and extending its lifespan by minimizing exposure to elevated temperatures. This study highlights the complex interplay between heat generation, flow dynamics, and chemical degradation, providing insights for improved lubricant performance, predictive maintenance strategies, and enhanced engine reliability.