A numerical study of cylinders in waves and currents

被引:32
作者
Zhou, CY [1 ]
Graham, JMR [1 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Dept Aeronaut, London SW7 2BY, England
关键词
D O I
10.1006/jfls.1999.0276
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The research on combination flow of planar oscillatory flow plus an in-line steady stream is of importance to the situation of structures in waves: and current. The combination flow has not been studied extensively. There is still little information about the effect of current and about combined effect of current and waves on hydrodynamic loading of the structures. The present study investigates the combination flow around a circular cylinder using a vortex-based method incorporating vortex moving particles (discrete vortices) with a finite-difference scheme for the vorticity diffusion. The main attention is paid to the effects of a small current on in-line fluid forces and vortex patterns in the wake. Morison's equation and an equation with two drag terms are examined. The results show that the presence of a small current in an oscillatory flow can reduce the drag coefficient significantly. Morison's equation gives reasonably good predictions for the in-line forces for an oscillatory flow plus a small current. The current tends to bring the whole vortex wake downstream and tries to form the stable Karman asymmetrical form in the downstream wake. The present results show certain agreement with some previous experimental results. (C) 2000 Academic Press.
引用
收藏
页码:403 / 428
页数:26
相关论文
共 27 条
[1]  
[Anonymous], J PETROLEUM TECHNOLO
[2]   Developments in the understanding of bluff body flows [J].
Bearman, PW .
JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING, 1998, 41 (01) :103-114
[3]   FORCES ON CYLINDERS IN VISCOUS OSCILLATORY FLOW AT LOW KEULEGAN-CARPENTER NUMBERS [J].
BEARMAN, PW ;
DOWNIE, MJ ;
GRAHAM, JMR ;
OBASAJU, ED .
JOURNAL OF FLUID MECHANICS, 1985, 154 (MAY) :337-356
[4]  
BEARMAN PW, 1978, IAHR S MECH WAV IND
[5]  
CHAPLIN JR, 1992, BENCHMARKING CFD COD
[6]   Numerical study of slightly viscous flow [J].
Chorin, Alexandre Joel .
JOURNAL OF FLUID MECHANICS, 1973, 57 :785-796
[7]  
CHRISTIANSEN JP, 1973, J COMPUT PHYS, V13, P363, DOI 10.1016/0021-9991(73)90042-9
[8]   EXPERIMENTAL AND NUMERICAL STUDY OF VORTEX COUPLES IN TWO-DIMENSIONAL FLOWS [J].
COUDER, Y ;
BASDEVANT, C .
JOURNAL OF FLUID MECHANICS, 1986, 173 :225-251
[9]  
DALRYMPLE RA, 1975, P CIVIL ENG OCEANS, V3, P999
[10]  
GRAHAM JMR, 1988, NUMERICAL METHODS FL, V3, P310