Generalized thick strip modelling for vortex-induced vibration of long flexible cylinders

被引:42
作者
Bao, Y. [1 ,2 ]
Palacios, R. [2 ]
Graham, M. [2 ]
Sherwin, S. [2 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, Dept Civil Engn, 800 Dongchuan Rd, Shanghai, Peoples R China
[2] Imperial Coll London, Dept Aeronaut, South Kensington Campus, London, England
基金
英国工程与自然科学研究理事会;
关键词
Fourier spectral/hp element method; Vortex-induced vibration; Flexible cylinder; Thick" strip modelling; SPECTRAL VANISHING VISCOSITY; NUMERICAL SIMULATIONS; FORCE DISTRIBUTION; FLOW; WAKE; VIV; SUBJECT; CONVERGENCE; ALGORITHM; MASS;
D O I
10.1016/j.jcp.2016.05.062
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
We propose a generalized strip modelling method that is computationally efficient for the VIV prediction of long flexible cylinders in three-dimensional incompressible flow. In order to overcome the shortcomings of conventional strip-theory-based 2D models, the fluid domain is divided into "thick" strips, which are sufficiently thick to locally resolve the small scale turbulence effects and three dimensionality of the flow around the cylinder. An attractive feature of the model is that we independently construct a three-dimensional scale resolving model for individual strips, which have local spanwise scale along the cylinder's axial direction and are only coupled through the structural model of the cylinder. Therefore, this approach is able to cover the full spectrum for fully resolved 3D modelling to 2D strip theory. The connection between these strips is achieved through the calculation of a tensioned beam equation, which is used to represent the dynamics of the flexible body. In the limit, however, a single "thick" strip would fill the full 3D domain. A parallel Fourier spectral/hp element method is employed to solve the 3D flow dynamics in the strip-domain, and then the VIV response prediction is achieved through the strip-structure interactions. Numerical tests on both laminar and turbulent flows as well as the comparison against the fully resolved DNS are presented to demonstrate the applicability of this approach. (C) 2016 Published by Elsevier Inc.
引用
收藏
页码:1079 / 1097
页数:19
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