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 3

Displaying 1-14 of 14 articles from this issue

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Development of Nonhydrostatic Atmospheric General Circulation Model using an Icosahedral Grid

Hirofumi TOMITA

2006 Volume 25 Issue 3 Pages 181-186
Published: June 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.181

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Short-wavelength stability analysis of thin vortex rings

Yuji HATTORI

2006 Volume 25 Issue 3 Pages 187-190
Published: June 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.187

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Development of Micro Bubble Generator and its Technological Establishment

Hirofumi OHNARI

2006 Volume 25 Issue 3 Pages 191-195
Published: June 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.191

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[title in Japanese]

[in Japanese], [in Japanese]

2006 Volume 25 Issue 3 Pages 197
Published: June 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.197

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Numerical and Experimental Elucidation of the Drag Reduction Mechanism by Microbubbles

Takafumi KAWAMURA

2006 Volume 25 Issue 3 Pages 199-208
Published: June 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.199

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Experimental study on Skin Frictional Drag Reduction by Microbubbles

Hisanobu KAWASHIMA, Yoshiaki KODAMA

2006 Volume 25 Issue 3 Pages 209-217
Published: June 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.209

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Active Control of Combustion-Driven Oscillations by Secondary Fuel Injection

Shigeru TACHIBANA, Laurent ZIMMER, Yoji KUROSAWA, Kazuo SUZUKI

2006 Volume 25 Issue 3 Pages 219-227
Published: June 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.219

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Combustion Control by Forced Pulsating Mixture Supply and Detection of Symptoms of Combustion Oscillation

Fumiteru AKAMATSU, Young-Joon YANG, Masashi KATSUK

2006 Volume 25 Issue 3 Pages 229-238
Published: June 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.229

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Wet Chemical Etching by Oblique stagnation-point flows

Fumihiro SUGINO, Takeshi MIYAZAKI

2006 Volume 25 Issue 3 Pages 239-246
Published: June 25, 2006
Released on J-STAGE: May 24, 2011

DOIhttps://doi.org/10.11426/nagare1982.25.239

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Wet chemical etching (WCE) is used for making shadow masks that have many microscopic holes in a steel sheet. The etching rate is limited by removal of the dissolution products from the vicinity of the active surface. In this paper, we investigate the fluid mechanical aspects and the mass transport phenomena in WCE by an oblique stagnation flow. The flow pattern and the distribution of Sh_x change according to the angle of incidence and the relative location of the stagnation-point to the hole center. Compared with the limiting cases of vertical and horizontal stagnation flows, Sh_x along the active surface becomes small in general. The quasi-stationary shape evolution is investigated and an intermediate behavior is observed compared with the two limiting cases.

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Characteristics of Numerical Error on Overset Grid

Takeshi SUGIMURA, Keiko TAKAHASHI, Hitoshi SAKAGAMI

2006 Volume 25 Issue 3 Pages 247-256
Published: June 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.247

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Charasterics of numerical error on overset grid systems are studied. We showed that wave dispersion relation in an overset region is important in order to compute advection equations with less numrical errors. We presented that CIP scheme are one of the most useful schemes to represent wave propagation with high accuracy on overset grid systems.

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Measurement of Aerodynamic Forces Exerted on a Hard Baseball

Tetsuya TANIGUCHI, Takeshi MIYAZAKI, Tetsuya SHIMIZU, Ryutaro HIMENO

2006 Volume 25 Issue 3 Pages 257-264
Published: June 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.257

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Using a high-speed video camera, we have recorded the trajectory and the rotation of a hard baseball and a sphere thrown by real pitchers and pitching machines. We measured the drag and lift coefficients by analyzing the video images. We altered pitching machines on the market in order to throw a ‘gyro-ball’, whose rotational axis lies almost i n the translational direction. The drag coefficient of a gyro-ball decreases with the Reynolds number (Re) and attains its minimum at Re = 1.8 × 10⁵, while the drag coefficient of a straight ball is independent of Re in the range 1 × 10⁵ < Re < 2 × 10⁵. The drag coefficient of a sphere is larger than that of a hard baseball for straight- and gyro-pitches, indicating that seams on the ball surface have substantial influence on the flow field.

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6. Vortex Ring

Yasuhide FUKUMOTO

2006 Volume 25 Issue 3 Pages 265-280
Published: June 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.265

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Feedback Control of Turbulent Wall Shear Flow

Chapt. 1 Development of hot wire and laser Doppler anemometer

Masanobu MAEDA

2006 Volume 25 Issue 3 Pages 281-291
Published: June 25, 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.281

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Erratum to : Feedback Control of Wall Turbulence Using MEMS Devices

2006 Volume 25 Issue 3 Pages 298
Published: 2006
Released on J-STAGE: October 22, 2010

DOIhttps://doi.org/10.11426/nagare1982.25.298

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