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Withdrawal of heat from internal combustion engines is a major concern in today's automotive industry, mainly due to material constraints and components durability. In this sense, a numerical study was conducted to analyze the water flow inside MWM INTERNATIONAL's high-speed diesel engine, in order to determine possible cavitation regions, which can reduce the heat transfer efficiency. The analysis is carried out with the help of computational fluid dynamics (CFD) commercial software FLUENT, from ANSYS Inc. The model was built as steady-state, turbulent, single phase flow. Heat transfer from the solid water jacket to the fluid zone was also considered. For this reason, the cavitation regions were identified through vapor pressure.

This paper presents the methodology for structural analysis of a high-speed Diesel engine aluminum cylinder head for Pick-up application, considering the finite element method. As boundary conditions, it was considered the loads from the bolts tightening process, combustion peak pressure, and thermal loading. The stresses generated during the assembly of the valve seats and valve guides were also evaluated. The valve train dynamic loads were not analyzed or considered in this paper, due to its negligible effects at the critical regions. The FE model contains the upper part of the crankcase and the entire cylinder head. Heat transfer coefficients at the water jackets were obtained from a CFD calculation and used at the heat transfer analysis to evaluate the thermal stresses. The residual stresses generated by the casting and manufacturing processes, as well the heat treatments for the alloy mechanical properties improvements, are also considered on this analysis.