Sound Generation by Head-On Collision of Two Vortex Rings

1979 ◽  
pp. 123-129 ◽  
Author(s):  
T. Kambe ◽  
T. Murakami
Keyword(s):  
Vortex Rings ◽  
Sound Generation

Sound Generation in Oblique Collision of Two Vortex Rings

1998 ◽  
Vol 67 (7) ◽  
pp. 2306-2314 ◽  
Author(s):  
Katsuya Ishii ◽  
Shizuko Adachi ◽  
Tsutomu Kambe
Keyword(s):  
Vortex Rings ◽  
Sound Generation ◽  
Oblique Collision

THE INTERACTION OF PERTURBED VORTEX RINGS AND ITS SOUND GENERATION. PART II

1999 ◽  
Vol 228 (3) ◽  
pp. 511-541 ◽  
Author(s):  
N.W.M KO ◽  
R.C.K LEUNG ◽  
C.C.K TANG
Keyword(s):  
Vortex Rings ◽  
Sound Generation

Sound generation by head-on and oblique collisions of two vortex rings

2008 ◽  
Vol 20 (5) ◽  
pp. 056102 ◽  
Author(s):  
Yoshitaka Nakashima
Keyword(s):  
Vortex Rings ◽  
Sound Generation

Why Do Vortices Generate Sound?

1995 ◽  
Vol 117 (B) ◽  
pp. 252-260 ◽  
Author(s):  
Alan Powell
Keyword(s):  
Mach Number ◽  
Incompressible Flow ◽  
Vortex Rings ◽  
Inviscid Fluid ◽  
Fluid Density ◽  
Sound Generation ◽  
Simple Argument ◽  
Low Mach Number ◽  
Vortex Sound ◽  
Moving Vortex

Emphasizing physical pictures with a minimum of analysis, an introductory account is presented as to how vortices generate sound. Based on the observation that a vortex ring induces the same hydrodynamic (incompressible) flow as does a dipole sheet of the same shape, simple physical arguments for sound generation by vorticity are presented, first in terms of moving vortex rings of fixed strength and then of fixed rings of variable strength. These lead to the formal results of the theory of vortex sound, with the source expressed in terms of the vortex force ρ(u∧ ζ) and of the form introduced by Mo¨hring in terms of the vortex moment (y∧ ζ′), (ρ is the constant fluid density, u the flow velocity, ζ = ∇ ∧u the vorticity and y is the flow coordinate). The simple “Contiguous Method” of finding the contiguous acoustic field surrounding an acoustically compact hydrodynamic (incompressible) field is also discussed. Some very simple vortex flows illustrate the various ideas. These are all for acoustically compact, low Mach number flows of an inviscid fluid, except that a simple argument for the effect of viscous dissipation is given and its relevance to the “dilatation” of a vortex is mentioned.

Sound generation by the leapfrogging between two coaxial vortex rings

2002 ◽  
Vol 14 (9) ◽  
pp. 3361-3364 ◽  
Author(s):  
Osamu Inoue
Keyword(s):  
Vortex Rings ◽  
Sound Generation

THE INTERACTION OF PERTURBED VORTEX RINGS AND ITS SOUND GENERATION

1997 ◽  
Vol 202 (1) ◽  
pp. 1-27 ◽  
Author(s):  
R.C.K. Leung ◽  
N.W.M. Ko
Keyword(s):  
Vortex Rings ◽  
Sound Generation

Why Do Vortices Generate Sound?

1995 ◽  
Vol 117 (B) ◽  
pp. 252-260 ◽  
Author(s):  
Alan Powell
Keyword(s):  
Mach Number ◽  
Incompressible Flow ◽  
Vortex Rings ◽  
Inviscid Fluid ◽  
Fluid Density ◽  
Sound Generation ◽  
Simple Argument ◽  
Low Mach Number ◽  
Vortex Sound ◽  
Moving Vortex

Emphasizing physical pictures with a minimum of analysis, an introductory account is presented as to how vortices generate sound. Based on the observation that a vortex ring induces the same hydrodynamic (incompressible) flow as does a dipole sheet of the same shape, simple physical arguments for sound generation by vorticity are presented, first in terms of moving vortex rings of fixed strength and then of fixed rings of variable strength. These lead to the formal results of the theory of vortex sound, with the source expressed in terms of the vortex force ρ(u∧ ζ) and of the form introduced by Mo¨hring in terms of the vortex moment (y∧ ζ′), (ρ is the constant fluid density, u the flow velocity, ζ = ∇ ∧u the vorticity and y is the flow coordinate). The simple “Contiguous Method” of finding the contiguous acoustic field surrounding an acoustically compact hydrodynamic (incompressible) field is also discussed. Some very simple vortex flows illustrate the various ideas. These are all for acoustically compact, low Mach number flows of an inviscid fluid, except that a simple argument for the effect of viscous dissipation is given and its relevance to the “dilatation” of a vortex is mentioned.

Two interacting vortex ring pairs and their sound generation

AIAA Journal ◽  
2000 ◽  
Vol 38 ◽  
pp. 79-86 ◽  
Author(s):  
N. W. M. Ko ◽  
R. C. K. Leung ◽  
K. Lam
Keyword(s):  
Vortex Ring ◽  
Sound Generation
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