Numerical Simulation of Flow Control of a Riser Attached with Axial-Rod Shrouds Using Discrete Vortex Method

Abstract

Abstract:

Abstract： In this paper, a two dimensional flow around a riser and the one attached with axial-rod shrouds were investigated using discrete vortex method (DVM) respectively. It is shown that at different shroud numbers, shrouds can suppress the drag and lift coefficients, and vortex shedding to some extent, except for the case of 4 rods number with 45° inflow. The large number of rods achieves better suppression effect. Compared with the results of 10 rods with 4 rods, it is shown that the 10-rod shroud is less sensitive to the inflow direction than the 4-rod shroud. For the 10-rod shroud, both time-averaged drag coefficient and fluctuating lift coefficient are less than those of the corresponding bare cylinder with a reduction up to about 26% and 79% respectively. DVM can be useful for the research of flow of circular cylinder and flow suppression because of its quick, simple, and reliable features.
Key words：

Key words: discrete vortex method, flow around a circular cylinder, riser, axial-rod shroud

HUANG Xilongb,WANG Jiasonga,b. Numerical Simulation of Flow Control of a Riser Attached with Axial-Rod Shrouds Using Discrete Vortex Method[J]. Journal of Shanghai Jiaotong University, 2014, 48(12): 1760-1765.

References

［1］Chorin A J. Numerical study of slightly viscous flow ［J］. Journal of Fluid Mechanics, 1973, 57(4): 785796.

［2］董婧, 宗智, 陈伟, 等. 二维圆柱绕流的离散涡法计算［J］. 中国海洋平台, 2011, 26(1):411.

DONG Jing, ZONG Zhi, CHEN Wei, et al. Numerical simulation of twodimensional flow around a cylinder based on the discrete vortex method ［J］. China Offshore Platform, 2011, 26(1):411.

［3］Yamamoto C T, Meneghini J R, Saltara F, et al. Numerical simulations of vortexinduced vibration on flexible cylinders ［J］. Journal of Fluids and Structures, 2004, 19(4): 467489.

［4］郭晓玲. 低雷诺数下圆柱结构系统的流固耦合运动数值分析［D］. 大连：大连理工大学研究生院, 2013.

［5］Kumar R A, Sohn C H, Gowda B H L. Passive control of vortexinduced vibrations: An overview［J］. Recent Patents on Mechanical Engineering, 2008, 1(1): 111.

［6］邹琳, 林玉峰. 亚临界雷诺数下波浪型圆柱绕流的数值模拟及减阻研究［J］. 水动力学研究与进展: A 辑, 2010，26 （1): 3136.

ZHOU Lin, LIN Yufeng. Numerical simulation of turbulent flow around wavy cylinders at a subcritical Reynolds number and the investigation on drag reduction ［J］. Chinese Journal of Hydrodynamics: A, 2010，26 (1): 3136.

［7］Allen D, Lee L, Henning D. Fairings vs. helical strakes for suppression of vortexinduced vibration: Technical comparisons［C］//Offshore Technology Conference(OTC). Houston, USA: OTC, 2008.

［8］宋吉宁, 吕林, 张建侨, 等. 三根附属控制杆对海洋立管涡激振动抑制作用实验研究［J］. 海洋工程, 2009, 27(3): 2329.

SONG Jilin, LV Lin, ZHANG Jianqiao, et al. Experimental investigation of suppression of vortexinduced vibration of marine risers by three control rods ［J］. The Ocean Engineering, 2009, 27(3): 2329.

［9］Zdravkovich M M. Review and classification of various aerodynamic and hydrodynamic means for s uppressing vortex shedding［J］. Journal of Wind Engineering and Industrial Aerodynamics, 1981, 7(2): 145189.

［10］Sakamoto H, Haniu H. Optimum suppression of fluid forces acting on a circular cylinder［J］. Journal of Fluids Engineering, 1994, 116(2): 221227.

［11］谷斐, 王嘉松, 赵卓茂, 等. 隔水管附属管控制流动的风洞和水洞实验研究［J］. 水动力学研究与进展: A 辑, 2012, 27(3): 293302.

GU Fei, WANG Jiasong, ZHAO Zhuomao, et al. Wind and water tunnel experiments on flow control for a circular cylinder with axialrod shrouds attached ［J］. Chinese Journal of Hydrodynamics: A, 2012, 27(3): 293302.

［12］Quartapelle L, Napolitano M. Force and moment in incompressible flows ［J］. AIAA Journal, 1983, 21(6): 911913.

［13］Saltara F, Meneghini J R, Fregonesi R A. Numerical simulation of flow around elastically mounted cylinder ［J］. International Journal of Offshore and Polar Engineering, 2003, 13(2):99104.

［14］Wieselsberger C. New data on the laws of fluid resistance［M］. USA: National Advisory Committee for Aeronautics, 1922.

［15］Itoh Y, Tamura T. Large eddy simulation of turbulent flows around bluff bodies in overlaid grid systems［J］. Journal of Wind Engineering and Industrial Aerodynamics, 2008, 96(1011): 19381946.

［16］Blevins R D. Applied fluid dynamics handbook［M］. New York: Van Nostrand Reinhold Co., 1984.

［17］Mustto A A, Bodsteint G C R. Improved vortex method for the simulation of the flow around circular cylinders［J］. AIAA, 2001: A0l31110.

［18］Roshko A. On the development of turbulent wakes from vortex streets［R］. USA: NACA,1954: Rep. 1191.

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