The influence of nonlinear shear stress on partially averaged Navier-Stokes(PANS) method

• Published in: Journal of hydrodynamics. Series B Vol. 29; no. 3; pp. 479 - 484
• Main Author: 刘锦涛 郭鹏程 陈铁军 吴玉林
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.06.2017; Springer Singapore; Beijing Institute of Control Engineering, Beijing 100190, China%State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi'an University of Technology, Xi'an 710048, China%Department of Thermal Engineeering, Tsinghua University, Beijing 100084, China
• Subjects: circular cylinder; Engineering; Engineering Fluid Dynamics; Hydrology/Water Resources; Nonlinear PANS method; Numerical and Computational Physics; Simulation; unsolved eddy viscosity; velocity distribution; Nonlinear PANS method; unsolved eddy viscosity; velocity distribution; circular cylinder
• ISSN: 1001-6058; 1878-0342
• DOI: 10.1016/S1001-6058(16)60759-X

In most of partially averaged Navier-Stokes(PANS)methods,the Reynolds stress is solved by a linear hypothesis isotropic model.They could not capture all kinds of vortexes in tubomachineries.In this paper,a PANS model is modified from the RNG k-?turbulence model and is used to investigate the influence of the nonlinear shear stress on the simulation of the high pressure gradient flows and the large curvature flows.Comparisons are made between the result obtained by using the PANS model modified from the RNG k-?model and that obtained by using the nonlinear PANS methods.The flow past a curved rectangular duct is calculated by using the PANS methods.The obtained nonlinear shear stress agrees well with the experimental results,especially in the high pressure gradient region.The calculation results show that the nonlinear PANS methods are more reliable than the linear PANS methods for the high pressure gradient flows,the large curvature flows,and they can be used to capture complex vortexes in a turbomachinary.