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Heat transfer plays an important role in the conceptual and detail design of cooling system of modern DI engine and has considerable influence over their operational performance and durability. The consequential demand for higher possible heat transfer rates has lead to the very promising concept of providing for a controlled transition from pure single-phase convection to subcooled boiling flow in some high thermal load regions. In order to achieve controlled boiling over a wide range of operation conditions, the detailed flow and heat transfer analysis is essential. CFD simulation incorporating the boiling model is an effective approach for such analysis. Four different boiling heat transfer models are proposed and developed within CFD framework, two based on Division Description Method (DDM), and another two based on Superposition Method (SM).

Human thermal comfort in car cabin has become an important factor to evaluate the success of HVAC (heat ventilation air condition) system. To a HVAC of high quality, it is necessary to produce proper temperatures and air flows at all points including the human body, not just for some specific design conditions. But the current situation is that numerical simulation of HVAC system has still lacked of the link with the thermal source of human body, because of the difficulties in modeling the extremely complicated fluid/thermal system of human body. In this paper, a HVAC system with an accurate thermoregulation model of human body has been simulated in SC/Tetra CFD software, which successfully solves the critical problem coupling the air flow around the body with the human body internal heat transfer physics. Graphical output (including air velocities and temperatures) from SC/Tetra and JOS shows how a particular automotive HVAC system performs.