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With significant decrease in the background noise in present day automobiles, liquid slosh noise from an automotive fuel tank is considered as a major irritant during acceleration and deceleration. All major international OEMs and their suppliers try to reduce sloshing noise by various design modifications in the fuel tank. However, most major activities reported in open literature are primarily based on performing various CAE and experimental studies in isolation. However, noise generation and its propagation is a multiphysics phenomenon, where fluid mechanics due to liquid sloshing affects structural behaviour of the fuel tank and its mountings which in turn affects noise generation and propagation. In the present study a multiphysics approach to noise generation has been used to predict liquid sloshing noise from a rectangular tank.

A valve used in automotive applications for purging fuel vapors accumulated in canister to deliver into the engine intake is investigated. Computational Fluid Dynamics (CFD) methods are employed for predicting the maximum mass flow rate through the valve due to pressure drop across the upstream and downstream of the valve. The CFD analyses show good correlation with the experimentally determined pressure drop and the mass flow rate values across the purge valve. More specifically, the chocking behavior of the purge valve predicted through CFD accurately matches the experimental result. Finally, the CFD predicts the appearance of shock wave patterns when back pressure values at the purge valve system exit are varied. The predicted shock wave patterns can be detrimental under normal operating conditions of a fuel system.