Computational Fluid Dynamics and Experimental Study of Lock-in Phenomenon in Vortex-Induced Motions of a Cell-Truss Spar

• Published in: Shanghai jiao tong da xue xue bao Vol. 14; no. 6; pp. 757 - 762
• Main Author: 王颖 杨建民 吕海宁
• Format: Journal Article
• Language: English
• Published: Heidelberg Shanghai Jiaotong University Press 01.12.2009
• Subjects: Architecture; Computer Science; Electrical Engineering; Engineering; Life Sciences; Materials Science; 晶石; 桁架梁; 涡激; 细胞; 计算流体力学模拟; 计算流体动力学; 诱导; 锁定机制; computational fluid dynamics (CFD); model test; spar; lock in; P 751; vortex-induced motions (VIM)
• ISSN: 1007-1172; 1995-8188
• DOI: 10.1007/s12204-009-0757-0

Spar platforms could be subject to vortex-induced-motions （VIM） in certain current conditions. Lockin is a phenomenon which occurs in a range of reduced velocities in VIM. In this paper, a new concept of spar platform called cell-truss spar is studied using both computational fluid dynamics （CFD） and model test to investigate the VIM of the spar under different reduced velocities. The unique configuration of the cell-truss spar is carefully considered, and the unsteady flow around the spar is calculated and visualized in CFD simulations. A physical model with a scale ratio of 1：100 of the cell-truss spar is fabricated, and model tests are carried out in the current-generating ocean engineering basin. Many important parameters in VIM of the cell-truss spar are obtained, the occurrence of lock-in phenomenon is successfully simulated, and the mechanism and rules of lock-in are analyzed.