|Table of Contents|

Click and Copy

Numerical simulation of VIV for an elastic cylinder mounted on the spring supports with low mass-ratio

Info

Title:
Numerical simulation of VIV for an elastic cylinder mounted on the spring supports with low mass-ratio
Author(s):
XU Jun-ling and ZHU Ren-qing*
Affilations:
Author(s):
-
School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Keywords:
VIV;  low mass ratio;  stream-wise and transverse motion;  two-degree-of-freedom;  vortex shedding model;  CFD
分类号:
-
DOI:
-
Abstract:
With the development of the offshore deep water oil industry many researchers are focusing on the vortex-induced vibrations (VIV) of deep risers. In the present work, Reynolds–averaged Navier–Stokes (RANS) equations were combined with the SST turbulent model to simulate the stream-wise and transverse motion of an elastically mounted cylinder with a low mass-ratio, a natural frequency ratio of and an Re number between 5 300 and 32 000. The four-order Runge–Kutta method was applied to solve the oscillating equation of the cylinder. The relationship between reduced velocity and parameters of the cylinder, including the lift coefficient, the drag coefficient, displacement and the vortex structure were then compared with recent experimental results and discussed in detail. The present numerical simulation reproduced effects have been observed in experiments, such as the lock-in phenomenon, the hysteretic phenomenon and beating behavior.

References:

[1] SARPKAYA T. A critical review of the intrinsic nature of vortex-induced vibrations[J]. Journal of Fluids and Structures, 2004, 19: 389-447.
[2] WU G A, MOE Z J. The lift force on a cylinder vibrating in a current[J]. Journal of Offshore Mechanics and Arctic Engineering, 1990, 112: 297-303.
[3] SARPKAYA T. Hydrodynamic damping flow-induced oscillations and biharmonic response[J]. Journal of Offshore Mechanics and Arctic Engineering, 1995, 117: 232-238.
[4] JAUVTIS N, WILLIAMSON C H K. Vorte-induced vibration of a cylinder with two degrees of freedom[J]. Journal of Fluids and Structures, 2003, 17: 1035-1042.
[5] JAUVTIS N, WILLIAMSON C H K. The effect of two degrees of freedom on vertex-induced vibration at low mass and damping[J]. Journal of Fluids Mechanics, 2004, 509: 23-62.
[6] SANCHIS A, Sælevik G, GRUE J. Two-degree-of-freedom vortex-induced vibrations of a spring-mounted rigid cylinder with low mass ratio[J]. Journal of Fluids and Structures. 2008, 4: 907-919.
[7] KHALAK A, WILLIAMSON C H K. Motions, forces and mode transitions in vortex-induced vibrations at low mass-damping[J]. Journal of Fluids and Structures, 1999, 13: 813-851.

Memo

Memo:
-
Last Update: 2010-05-02