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A nonlinear partially-averaged Navier–Stokes model with near-wall correction for separated turbulent flow

College of Water Resources and Civil Engineering, China Agricultural University, Beijing Engineering Research Centre of Safety and Energy, Saving Technology for Water Supply System, Beijing 100083, China

E-mail Address: benqing@cau.edu.cn

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Wei Yang

E-mail Address: wyang@cau.edu.cn

Corresponding author.

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Sien Li

E-mail Address: lisien@163.com

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, and

Xianbei Huang

College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, China

E-mail Address: 13811435840@163.com

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https://doi.org/10.1142/S0217984921502626Cited by:5 (Source: Crossref)

Abstract

A nonlinear Partially-Averaged Navier–Stokes model with near-wall correction is developed for separated turbulent flow simulations. The periodic hills flow is simulated to validate the new model and the results are compared with the standard $k - 𝜀$ $k - 𝜀$ model, MPANS model, MSST PNAS model, standard $k - 𝜀$ $k - 𝜀$ PANS model, and experimental/LES results. It is found that the new model shows better performance in the prediction of both mean velocity and turbulent statistics compared to the other models. From the prediction of the near-wall friction coefficient of periodic hills flow, the new model shows good resolution in the near-wall region by considering the near-wall damping function to turbulent viscosity, gradient production term, and turbulence scale correction term for the near-wall region. From the analysis of anisotropy-invariant and sub-filtered stress (SFS), it can be found that the nonlinear term is necessary for prediction accuracy improvement in turbulent flow simulation with strong separation.

Keywords:

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