Wake dynamics of a 3D curved cylinder in oblique flows

International Journal of Naval Architecture and Ocean Engineering

Narakorn Srinil¹  Soonhyun Lee²  Kwang-Jun Paik² 

[1] Corresponding author.;Department of Naval Architecture and Ocean Engineering, Inha University, Incheon, South Korea;

关键词: Vortex-Induced Vibration (VIV);    Wake;    Curved cylinder;    Wake topology;    Large Eddy Simulation (LES);    criterion;   

DOI  :  

来源: DOAJ

【 摘 要 】

Three-dimensional numerical simulations were performed to study the effects of flow direction and flow velocity on the flow regime behind a curved pipe represented by a curved circular cylinder. The cylinder is based on a previous study and consists of a quarter segment of a ring and a horizontal part at the end of the ring. The cylinder was rotated in the computational domain to examine five incident flow angles of 0–180° with 45° intervals at Reynolds numbers of 100 and 500. The detailed wake topologies represented by λ2 criterion were captured using a Large Eddy Simulation (LES). The curved cylinder leads to different flow regimes along the span, which shows the three-dimensionality of the wake field. At a Reynolds number of 100, the shedding was suppressed after flow angle of 135°, and oblique flow was observed at 90°. At a Reynolds number of 500, vortex dislocation was detected at 90° and 135°. These observations are in good agreement with the three-dimensionality of the wake field that arose due to the curved shape.

【 授权许可】

Unknown