Large Eddy Simulation of a Turbulent Flow in a T-Junction
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چکیده
1. Introduction The problem of thermal fatigue is frequently encountered in the pipes where two flows with different temperatures mix together. The T-junction is one of the typical components with a considerable potential of thermal fatigue (Chapuliot et al. 2005; Hu & Kazimi 2006; Lee et al. 2009) and is used in many thermohydraulic systems such as combustion engines, turbines, exhaust systems, reheat systems and so on. The T-junction configuration consists of two pipe systems intersected perpendicularly, and they are called main and branch pipes. In nuclear thermo-hydraulic society, this T-junction configuration has received much interest because the two freestreams with a higher and lower temperatures mix and then induce thermal fatigue generated by the temperature change in the wall, which is known as the main source of the structural damage of T-junction. However, the issues related to this problem remain unresolved because the flow in the T-junction is a completely three-dimensional turbulent flow in that the interaction between the main and the branch flows creates the complex turbulent structure including the wide distribution types of eddies. In the present study, a numerical simulation is performed to investigate the phenomenon related to the turbulent flow and heat transfer in a T-junction. It is well known from literature that the problem cannot be accurately predicted by RANS-or URANS-based simulation approaches (Peniguel 1998).
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تاریخ انتشار 2012