Journal of Japan Society of Fluid Mechanics

Online ISSN : 2185-4912
Print ISSN : 0286-3154
ISSN-L : 0286-3154

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Volume 20, Issue 5

Displaying 1-9 of 9 articles from this issue

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[title in Japanese]

[in Japanese], [in Japanese]

2001 Volume 20 Issue 5 Pages 341-342
Published: October 25, 2001
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.20.341

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Fluid Motion in Natural Ecosystems

[in Japanese], [in Japanese]

2001 Volume 20 Issue 5 Pages 345
Published: October 25, 2001
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.20.345

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Fluid dynamics in Lake Ogawara related to the propagation of Corbicula Japonica

Tadaharu ISHIKAWA

2001 Volume 20 Issue 5 Pages 346-353
Published: October 25, 2001
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.20.346

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Numerical Simulation of Ecosystem in an Inner Bay

Masahiro TANAKA

2001 Volume 20 Issue 5 Pages 354-364
Published: October 25, 2001
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.20.354

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Flows Related to Morphology and Ecology of Horseshoe Crab

Satoquo SEINO

2001 Volume 20 Issue 5 Pages 365-374
Published: October 25, 2001
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.20.365

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Environmental Hydraulics on Coral Reefs

Kazuo NADAOKA

2001 Volume 20 Issue 5 Pages 375-383
Published: October 25, 2001
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.20.375

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Energy and CO₂ exchanges and the air flow in vegetation

Yoshinobu HARAZONO

2001 Volume 20 Issue 5 Pages 384-395
Published: October 25, 2001
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.20.384

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Linear and Nonlinear Resonant Oscillations of Inviscid Ideal Gas between Two Coaxial Cylinders

Eru KURIHARA, Yoshinori INOUE, Takeru YANO

2001 Volume 20 Issue 5 Pages 396-405
Published: October 25, 2001
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.20.396

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Resonant radial oscillations of an inviscid ideal gas between two coaxial infinite cylinders are studied, which are excited by sinusoidal pulsation of the outer cylinder. For the linear problem, the exact solution can readily be obtained, representing the standing wave and the resonant oscillations. The numerical result of the nonlinear problem shows that there are the periodical amplitude and phase modulations for the resonant wave. The wave amplitude reaches O (M^1/3), where M (<< 1) is the acoustic Mach number, and the period of the modulation varies proportionately with M^-2/3. The wave having the stronger nonlinearity has an asymmetric waveform with respect to the time axis. In the framework of the present analysis shock waves do not emanate.

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An Investigation on the Flow Around an Egg, a Golf Ball and a Sphere Pulled up by Impinging Water Stream

1 st Report, Critical Flow Rate

Tamotsu IGARASHI

2001 Volume 20 Issue 5 Pages 406-414
Published: October 25, 2001
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.20.406

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Let a faucet pour onto an egg sinking in a glass of water. For flow rates above some critical value, the egg will rise as if it were attracted to the falling water. Apparently nothing more than a description has been published on this demonstration. In this paper, this phenomenon was observed and the critical flow rate for an egg, a golf ball and a sphere were measured. The dominating factors on the critical flow rate for the bodies are the reference diameter, value and specific gravity of the egg, d, V and σ, the diameter and depth of the vessel, D and H, the density and kinematic viscosity of fluid, ρ and ν, and the acceleration of gravity, g. From the vector dimensional analysis, the critical flow rate is given by q_c/dν=C(D/d)^k (H/d)^m [(σ-1)Vg/ν²]ⁿ, for an egg, a golf ball and a Sphere. The constant C and the exponents k, m and n were obtained experimentally.

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