VORTEX STRIPPING AND THE EROSION OF COHERENT STRUCTURES IN 2-DIMENSIONAL FLOWS

被引:111
作者
MARIOTTI, A [1 ]
LEGRAS, B [1 ]
DRITSCHEL, DG [1 ]
机构
[1] UNIV CAMBRIDGE, DEPT APPL MATH & THEORET PHYS, CAMBRIDGE CB3 9EW, ENGLAND
关键词
D O I
10.1063/1.868385
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
This paper studies the erosion of a monotonically distributed vortex by the joint action of inviscid stripping, induced by an externally imposed adverse shear, and viscous diffusion, either in the form of Newtonian viscosity or hyperviscosity. It is shown that vortex erosion is greatly amplified by the presence of diffusion; abrupt vortex breakup or gradual quasi-equilibrium evolution depend crucially on the strain to peak vorticity ratio and on the Reynolds number. Peculiar, unexpected effects are observed when hyperviscosity is used in place of Newtonian viscosity. © 1994 American Institute of Physics.
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页码:3954 / 3962
页数:9
相关论文
共 13 条
[1]   CONTOUR DYNAMICS AND CONTOUR SURGERY - NUMERICAL ALGORITHMS FOR EXTENDED, HIGH-RESOLUTION MODELING OF VORTEX DYNAMICS IN TWO-DIMENSIONAL, INVISCID, INCOMPRESSIBLE FLOWS [J].
DRITSCHEL, DG .
COMPUTER PHYSICS REPORTS, 1989, 10 (03) :77-146
[2]   MODELING OCEANIC AND ATMOSPHERIC VORTICES [J].
DRITSCHEL, DG ;
LEGRAS, B .
PHYSICS TODAY, 1993, 46 (03) :44-51
[3]  
DRITSCHEL DG, 1989, MATH ASPECTS VORTEX, P107
[4]   MOTION OF AN ELLIPTIC VORTEX IN A UNIFORM SHEAR-FLOW [J].
KIDA, S .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1981, 50 (10) :3517-3520
[5]   A COMPARISON OF THE CONTOUR SURGERY AND PSEUDOSPECTRAL METHODS [J].
LEGRAS, B ;
DRITSCHEL, DG .
JOURNAL OF COMPUTATIONAL PHYSICS, 1993, 104 (02) :287-302
[6]   THE ELLIPTIC MODEL OF 2-DIMENSIONAL VORTEX DYNAMICS .1. THE BASIC STATE [J].
LEGRAS, B ;
DRITSCHEL, DG .
PHYSICS OF FLUIDS A-FLUID DYNAMICS, 1991, 3 (05) :845-854
[7]   VORTEX STRIPPING AND THE GENERATION OF HIGH VORTICITY GRADIENTS IN 2-DIMENSIONAL FLOWS [J].
LEGRAS, B ;
DRITSCHEL, D .
APPLIED SCIENTIFIC RESEARCH, 1993, 51 (1-2) :445-455
[8]   THE VORTICES OF 2-DIMENSIONAL TURBULENCE [J].
MCWILLIAMS, JC .
JOURNAL OF FLUID MECHANICS, 1990, 219 :361-385
[9]   AXISYMMETRIZATION AND VORTICITY-GRADIENT INTENSIFICATION OF AN ISOLATED TWO-DIMENSIONAL VORTEX THROUGH FILAMENTATION [J].
MELANDER, MV ;
MCWILLIAMS, JC ;
ZABUSKY, NJ .
JOURNAL OF FLUID MECHANICS, 1987, 178 :137-159
[10]  
MOORE DW, 1971, AIRCRAFT WAKE TURBUL