Direct numerical simulation of turbulent channel flow with spanwise alternatively distributed strips control

Ni, Weidan; Lu, Lipeng; Fang, Jian; Moulinec, Charles; Yao, Yufeng

Abstract

© 2018 World Scientific Publishing Company. The effect of spanwise alternatively distributed strips (SADS) control on turbulent flow in a plane channel has been studied by direct numerical simulations to investigate the characteristics of large-scale streamwise vortices (LSSVs) induced by small-scale active wall actuation, and their potential in suppressing flow separation. SADS control is realized by alternatively arranging out-of-phase control (OPC) and in-phase control (IPC) wall actuations on the lower channel wall surface, in the spanwise direction. It is found that the coherent structures are suppressed or enhanced alternatively by OPC or IPC, respectively, leading to the formation of a vertical shear layer, which is responsible for the LSSVs' presence. Large-scale low-speed region can also be observed above the OPC strips, which resemble large-scale low-speed streaks. LSSVs are found to be in a statistically-converged steady state and their cores are located between two neighboring OPC and IPC strips. Their motions contribute significantly to the momentum transport in the wall-normal and spanwise directions, demonstrating their potential ability to suppress flow separation.

Citation

Ni, W., Lu, L., Fang, J., Moulinec, C., & Yao, Y. (2018). Direct numerical simulation of turbulent channel flow with spanwise alternatively distributed strips control. Modern Physics Letters B, 32(12-13), 1840004. https://doi.org/10.1142/S0217984918400043

• Journal Article Type: Article
• Acceptance Date: Apr 27, 2018
• Online Publication Date: Apr 27, 2018
• Publication Date: May 10, 2018
• Deposit Date: May 9, 2018
• Publicly Available Date: Apr 27, 2019
• Journal: Modern Physics Letters B
• Print ISSN: 0217-9849
• Electronic ISSN: 1793-6640
• Publisher: World Scientific Publishing
• Peer Reviewed: Peer Reviewed
• Volume: 32
• Issue: 12-13
• Pages: 1840004
• DOI: https://doi.org/10.1142/S0217984918400043
• Keywords: SADS control, OPC/IPC, channel flow, DNS
• Public URL: https://uwe-repository.worktribe.com/output/875381
• Publisher URL: http://dx.doi.org/10.1142/S0217984918400043
• Additional Information: Additional Information : Electronic version of an article published as Ni, W., Lu, L., Fang, J., Moulinec, C. and Yao, Y. (2018) Direct numerical simulation of turbulent channel flow with spanwise alternatively distributed strips control. Modern Physics Letters B. p. 1840004. ISSN 0217-9849 © copyright World Scientific Publishing Company. http://dx.doi.org/10.1142/S0217984918400043
• Contract Date: May 9, 2018