Journal of Japan Society of Fluid Mechanics

Three-Dimensional Distortions of a Vortex Filament with Axial Velocity

Yasuhide FUKUMOTO

1994 Volume 13 Issue 2 Pages 84-98
Published: April 28, 1994
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.13.84

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An Analysis of Highly Viscous Flow Using Imai's Complex Function Method with Application to Screen Printing

Modelizing the Phenomenon in a Highly Viscous Flow

Jun-ichi KAWABATA

1994 Volume 13 Issue 2 Pages 99-102
Published: April 28, 1994
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.13.99

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Marangoni Convection

Toshio FUNADA

1994 Volume 13 Issue 2 Pages 103-114
Published: April 28, 1994
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.13.103

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A review of the Marangoni effect and Marangoni instability to drive convection is given on the standpoint of fluid mechanics. The method of theoretical study of the Marangoni convection is explained for the cases of flat and deformable interfaces. A brief summary of analysis of linear and nonlinear surface waves is added.

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Stability of Quasi-Two-Dimensional Flows

Youichi MURAKAMI

1994 Volume 13 Issue 2 Pages 115-123
Published: April 28, 1994
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.13.115

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The stability properties of the two-dimensional flows with the bottom-friction effect are summarized in this review. On the quasi-two-dimensional (Q2D) approximation the dynamics of these flows is described by the 2D Navier-Stokes equation with the linear damping term proportional to the horizontal velocity which originates from the vertical boundary layer on the bottom. Three kinds of stability : the linear stability, the weakly nonlinear stability and the nonlinear stability by the energy method are considered. The linear critical Reynolds number and the wavenumber of the most unstable mode are virtually independent of the form of the velocity profile while the Landau coefficient is sensitive to it. Difference between both linear and nonlinear critical Reynolds numbers is relatively small when the bottom-friction is sufficiently large.

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Control of Three-Dimensional Boundary-Layer on a Rotating Disk

Yasuaki KOHAMA, Katsunori SUZUKI

1994 Volume 13 Issue 2 Pages 124-130
Published: April 28, 1994
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.13.124

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Detailed investigation in the crossflow field on a rotating disk boundary-layer have been done and complicated three-dimensional (3-D) flow structure and turbulent transition process in the crossflow instability field were greatly clarified by using both hot-wire measurement and an effective flow visualization technique. Taking into account of obtained local fine structure in the transition field, an unique suction system is manufactured, and the flow field is measured applying suction. Results showed that limited delay of the onset of transition is observed. Present suction system can be applied to more practical 3-D boundary-layer flow on swept wings and spinning bodies.

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Numerical Study of Natural Convection in a Cylindrical Cavity with a Heated Part of the Vertical Wall

Mitsuo SAKATA

1994 Volume 13 Issue 2 Pages 131-142
Published: April 28, 1994
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.13.131

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Natural convection flow in a cylindrical cavity is numerically investigated. The cavity is bounded by a vertical circular cylinder with ratio of height to radius 10, and heat source is located on the central region of the vertical wall with height equal to diameter.
In the case of a small Grashof number Gr and fixed Prandtl number Pr= 0.72, a steady-state flow is obtained with three convection cells corresponding to thermal boundary condition. The flow is changed from a steady-state to oscillatory states at the critical value of Gr which lies between about 1.2 × 10⁴ and 1.22 × 10⁴. In the range of large Gr, we can observe a periodic state, a periodic doubling state, and a periodic four-cell state with increasing Gr.

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[title in Japanese]

[in Japanese]

1994 Volume 13 Issue 2 Pages 143-147
Published: April 28, 1994
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.13.143

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[title in Japanese]

[in Japanese]

1994 Volume 13 Issue 2 Pages 148-153
Published: April 28, 1994
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.13.148

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[title in Japanese]

[in Japanese], [in Japanese]

1994 Volume 13 Issue 2 Pages 154-155
Published: April 28, 1994
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.13.154

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