On the capability of the curvilinear immersed boundary method in predicting near-wall turbulence of turbulent channel flows  

作　　者：Fei Liao Xiaolei Yang 

机构地区：[1]State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China [3]School of Engineering Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Theoretical & Applied Mechanics Letters》2021年第4期213-218,共6页力学快报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(NSFC)Basic Science Center Program for“Multiscale Problems in Nonlinear Mechanics”(No.11988102);the Strategic Priority Research Program,Chinese Academy of Sciences(CAS)(No.XDB22040104).

摘　　要：The immersed boundary method has been widely used for simulating flows over complex geometries.However,its accuracy in predicting the statistics of near-wall turbulence has not been fully tested.In this work,we evaluate the capability of the curvilinear immersed boundary(CURVIB)method in predicting near-wall velocity and pressure fluctuations in turbulent channel flows.Simulation results show that quantities including the time-averaged streamwise velocity,the rms(root-mean-square)of velocity fluctuations,the rms of vorticity fluctuations,the shear stresses,and the correlation coefficients of u'and v"computed from the CURVIB simulations are in good agreement with those from the body-fitted simulations.More importantly,it is found that the time-averaged pressure,the rms and wavenumber-frequency spectra of pressure fluctuations computed using the CURVIB method agree well with the body-fitted results.

关 键 词：Immersed boundary method Turbulent channel flow Wavenumber-frequency spectra Near-wall turbulence 

分 类 号：O357.5[理学—流体力学]