Journal of Japan Society of Fluid Mechanics

[title in Japanese]

[in Japanese], [in Japanese]

1993 Volume 12 Issue 2 Pages 85-86
Published: June 30, 1993
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.12.85

JOURNAL FREE ACCESS

Download PDF (2104K)
On the equation : h⁽¹⁾_η+ah⁽¹⁾h⁽¹⁾_ξ+bh⁽¹⁾_ξξξ-ch⁽¹⁾=0 obtained at a shoaling beach

Tsunehiko KAKUTANI

1993 Volume 12 Issue 2 Pages 101-104
Published: June 30, 1993
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.12.101

JOURNAL FREE ACCESS

Download PDF (510K)
Predictability of Atmospheric Motions

The Prediction of Forecast Skill

Hitoshi MUKOHGAWA

1993 Volume 12 Issue 2 Pages 105-112
Published: June 30, 1993
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.12.105

JOURNAL FREE ACCESS

Download PDF (1103K)
Numerical Study of Compressible Two-Stream Parallel Mixing Layers

Compressibility Effects and Three-Dimensionality

Itaru HATAUE

1993 Volume 12 Issue 2 Pages 128-139
Published: June 30, 1993
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.12.128

JOURNAL FREE ACCESS

Show abstractHide abstract

Unforced compressible mixing layers between parallel two streams are studied numerically. The growth rate of the mixing layer decreases, and some statistics change, with increasing Mach number due to the so-called compressibility effect. This compressibility effects in the compressible mixing layer are discussed on the basis of the simultaneously obtained statistics. Harten type second order TVD (Total Variation Diminishing) scheme and LU-ADI efficient implicit scheme are applied in order to solve the two- and three-dimensional compressible Navier-Stokes equations without using any turbulence model.
Three-dimensional structure of the flow field of the computed supersonic mixing layer is also discussed and compared with those in other experimental and theoretical reports.

View full abstract

Download PDF (1420K)
A Study of Flows around a Rotating Square Cylinder

Shigeaki KURODA, Hideyuki OHBA

1993 Volume 12 Issue 2 Pages 140-146
Published: June 30, 1993
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.12.140

JOURNAL FREE ACCESS

Show abstractHide abstract

Flows around a rotating square cylinder are analyzed numerically and experimentally. In the numerical analysis, a moving grid system is installed, and C_D, C_L and flow patterns are analyzed for several different values of Reynolds number and rotating angular velocities. Synchronization phenomena are found between vortex shedding and the rotation of cylinder. Flow visualization is carried out and stream lines from the experimental results show good agreement with the computational results.

View full abstract

Download PDF (1319K)
Generation of Puffs in a Pipe

Kazuo MATSUUCHI, Tsutomu ADACHI

1993 Volume 12 Issue 2 Pages 147-156
Published: June 30, 1993
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.12.147

JOURNAL FREE ACCESS

Show abstractHide abstract

It is well known that a peculiar turbulent lump called a “puff” appears in a transitional pipe flow. The puff is stable and has a self-sustained mechanism. Several authors have reported on remarkable characteristics of puffs. However, the condition for the generation of puffs has hardly been studied, because it is very difficult to measure the flow properties simultaneously at different axial locations without disturbing the downstream condition. In order to know the generation, two specially designed hot wires were set upstream to measure the initial growth of the puff, and a third wire was located far downstream for detection of equilibrium puffs. Experiments were made at Reynolds numbers near 2200. In two inlet conditions of the pipe, the effect of the strength of inlet disturbances on the generation was investigated. As a result, conditions for the generation and growth of puffs were clarified.

View full abstract

Download PDF (1270K)
Linear Stability Analysis of Self-Excited Motion of Liquid-Liquid Interface with Chemical Reaction

Kimie SANNOMIYA, Ryuji TAKAKI

1993 Volume 12 Issue 2 Pages 157-168
Published: June 30, 1993
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.12.157

JOURNAL FREE ACCESS

Show abstractHide abstract

Self-excited fluid motion on the both sides of an interface of two immiscible liquids is analysed in the case where a chemical reaction is occuring on the interface and reactants are supplied through diffusion. Effects of variation of the interfacial tension coefficient, onsets of viscous flows in both fluids and surface viscosity of the interface are considered. The interface is assumed to move within its plane driven by the variation of the surface tension. The results of linear stability analysis suggest an existence of a wave length with the largest instability. Dependences of the instability on several parameters are obtained.

View full abstract

Download PDF (1472K)
Stability of Stationary Thermal Convection with Temperature-Dependent Viscosity

Osamu HIRAYAMA, Ryuji TAKAKI

1993 Volume 12 Issue 2 Pages 169-181
Published: June 30, 1993
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.12.169

JOURNAL FREE ACCESS

Show abstractHide abstract

Multi-valued stationary solutions of two-dimensional Bénard convection of a fluid with temperature-dependent viscosity were obtained in the previous papers for Rayleigh number 3000 and Prandtl number 1000 by numerical computation. In this paper stabilities of the two-valued stationary solutions are treated numerically in the presence of types of disturbances with finite amplitude. By solving the time-dependent governing equation numerically, it is found that the stability characteristics can be expressed conventionally in terms of a distance of non-steady solution from the stationary solutions.

View full abstract

Download PDF (1909K)
[title in Japanese]

[in Japanese]

1993 Volume 12 Issue 2 Pages 182-184
Published: June 30, 1993
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.12.182

JOURNAL FREE ACCESS

Download PDF (348K)
[title in Japanese]

[in Japanese], [in Japanese]

1993 Volume 12 Issue 2 Pages 187-188
Published: June 30, 1993
Released on J-STAGE: March 07, 2011

DOIhttps://doi.org/10.11426/nagare1982.12.187

JOURNAL FREE ACCESS

Download PDF (349K)

Register with J-STAGE for free!