Journal of Japan Society of Fluid Mechanics

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

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Volume 25, Issue 2

Displaying 1-9 of 9 articles from this issue

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Dream of controlling turbulence, half-way of dream-I

[in Japanese], [in Japanese]

2006 Volume 25 Issue 2 Pages 93
Published: April 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.93

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Feedback Control of Wall Turbulence Using MEMS Devices

Yuji SUZUKI, Nobuhide KASAGI

2006 Volume 25 Issue 2 Pages 95-102
Published: April 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.95

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Active Control of Turbulence using Alternating Suction and Blowing Jets

Takehiko SEGAWA, Hiro YOSHIDA

2006 Volume 25 Issue 2 Pages 103-110
Published: April 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.103

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Smart Control of Flow Separation around a Wing

Akira NISHIZAWA, Shohei TAKAGI, Hiro YOSHIDA

2006 Volume 25 Issue 2 Pages 111-118
Published: April 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.111

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Flow Controlling Attempts against a Sound Generating Cavity Flow and a Transitional Boundary Layer

Yu FUKUNISHI, Yuzuru YOKOKAWA, Takeshi SAKAI, Hiroshi MAITA, Kazuya SA ...

2006 Volume 25 Issue 2 Pages 119-126
Published: April 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.119

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Mushroom Type Vortices around a Vortex

Muneshige OKUDE, Nobuyuki OKURA, Hidetoshi HAYAFUJI

2006 Volume 25 Issue 2 Pages 127-135
Published: April 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.127

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An isolated vortex was generated between the two rotors which faced each other in a small test tank. The flow patterns in the circumference of a vortex were observed by means of the flow visualization technique. The vorticity distribution in the vortex core was the same as that of a viscous vortex model. The velocity distribution around the periphery of the vortex core was indicated by V-1/rⁿ where n>1. The mushroom-type vortices which appeared around a rotating cylinder were observed in the circumference of isolated vortex. The isolated vortex collapsed and became turbulent, soon after the mushroom-type vortices appeared in the circumference of it. The mechanism of generation of the mushroom-type vortices in the circumference of the isolated vortex seemed to be similar to that of a rotating cylinder.

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Bifurcation Problem of Coherent Structures in Channel Flow

Tomoaki ITANO, Sadayoshi TOH

2006 Volume 25 Issue 2 Pages 137-144
Published: April 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.137

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A traveling-wave solution with coherent structures typical in channel flow is numerically obtained by employing Newton-Raphson method and continuation of solutions by smooth transformation homotopy. The artificial force term used in the continuation method is different from that in Waleffe (2003) [Phys. Fluids. 15 (6) 1517], while the solution seems to be finally converged to the same. By applying the method to the computational domain with a spanwise wavelength that is twice that of Waleffe's solution, we have found the subharmonic branches of the solution, that contain not a single structure but several structures with different scales.

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Feedback Control of Turbulent Wall Shear Flow

Masanobu MAEDA

2006 Volume 25 Issue 2 Pages 145-152
Published: April 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.145

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The development and improvement of measurement techniques are introduced in connection with those of electronics from 1960 through 2000. Though the choice of using conventional equipments to solve the problems on application would be reasonable, the strong needs have also required new sophisticated measurement techniques. The recent progress in electronic devices has contributed closely to that of measurement instrumentation. The story would be described mainly with the experiences of the author and episodes with his friends.

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[title in Japanese]

[in Japanese]

2006 Volume 25 Issue 2 Pages 156
Published: April 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.156

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