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This paper describes a CAD/CAE approach for the numerical simulation of port-valve-cylinder flow in reciprocating engines. This approach complements the classical experimental approach, using steady state and transient measurements, and it can replaces experiments at the design stage. Computer software and hardware environment are discussed, including aspects concerning solid body modeling, mesh generation, CFD calculation, CPU requirements and results analysis. The simulation approach is assessed and validated through comparison with axisymmetric laboratory test results and actual engine configuration test results from MAZDA. The paper focuses on steady state analysis with open valve, and discusses the reproduction, by simulation, of flow features in the port- valve region, and their interaction with the flow on the entire port-valve-cylinder path.

Two papers describe an innovative joint simulation and experimental activity, established in order to evaluate a CAE approach for tool design optimization in sheet metal forming. The first target is to assess the CAE validity with respect to sheet behavior modelling, influence of holding and restraining conditions (including drawbeads), and the reproduction by simulation of local sheet elongations and thickness. A stretch drawn autobody component is taken as the practical application for this evaluation (Pre-Industrial Case). This Part 1 paper describes the simulation methodology and codes. It assesses different issues on material characterization, friction between sheet and tools, and drawbead restraining. In particular, strain rate effects and drawbead modelling are shown to have significant relevance.

Two papers describe an innovative joint simulation and experimental activity, established in order to evaluate a CAE approach for tool design optimization in sheet metal forming. The main target is to assess the CAE validity with respect to sheet behavior modelling, influence of holding and restraining conditions (including drawbeads), and the reproduction by simulation of local sheet elongation and thickness. A stretch drawn autobody component was taken as the practical application of this evaluation (Pre-Industrial Case). This is Part 2, describing in more details the autobody component of interest, the experimental measurements made, and the results of the simulations. Very good agreement was found when comparing experimental and numerical elongations along the critical lines. Also, the simulation was able to accurately reproduce complex stamping difficulties, such as for the development and squeezing of under punch bulges.