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Influence of the Thermal and RANS Closures on Walls Heat Transfers Computations

Abstract : This study deals with the heat transfer calculations between the internal walls of a duct and a non-isothermal turbulent flow inside this later on. The departure point for this work is the appearance of an asymmetry in the velocity fields, implying consequently a modification of the temperature profiles [1, 2]. Therefore, the fluid properties can be modified and the corresponding Reynolds numbers and associated non-dimensional distances to the wall (y+) can be significantly different from one side to another. We will first present the fluid and thermal modeling retained, using both an EB-RSM model with thermal GGDH closure and a k - e - v2/k model, i.e. two elliptic models either at order two or order one. Then, the heat transfers at the walls are computed on a 3D geometry consisting of a T\textendashjunction between a cylindrical pipe and a larger rectangular duct, whose flow are turbulent yet with different velocities. This type of devices corresponds usually to a part of a larger one involved in nuclear power plants.
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Submitted on : Tuesday, June 4, 2019 - 10:58:40 PM
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  • HAL Id : hal-02147716, version 1

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Erwin Franquet, V. Boutrouche, Sylvain Serra. Influence of the Thermal and RANS Closures on Walls Heat Transfers Computations. 30th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2017, 2017, San Diego, United States. ⟨hal-02147716⟩

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