Reynolds stress constrained large eddy simulation of separation flows in a U-duct

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Abstract

This paper presents Reynolds stress constrained large eddy simulation (RSC-LES) method applied to a U-duct flow. Different from traditional Reynolds-averaged Navier-Stokes/detached eddy simulation (RANS/DES) hybrid method (including DES method), the RSC-LES method solves the LES equations in the whole computation domain with the near-wall regions being constrained by a prescribed Reynolds stress. By doing so it is possible to overcome the log-law mismatch (LLM) problem in hybrid method. The RSC-LES results show better agreement with experiment result. Compared with RANS and DES, RSC-LES gives more accurate pressure coefficients and friction coefficients on the wall, because the RSC-LES method captures the separation point and reattachment point on the inner wall. The computation results show that the RSC-LES method has the potential to solve the log-law mismatch problem of RANS/DES hybrid method and predict complex phenomena of internal flow field.

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Xu, Q., & Yang, Y. (2014). Reynolds stress constrained large eddy simulation of separation flows in a U-duct. Propulsion and Power Research, 3(2), 49–58. https://doi.org/10.1016/j.jppr.2014.05.002

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