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Volume 17, Issue 1
Displaying 1-8 of 8 articles from this issue
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[in Japanese], [in Japanese]1998 Volume 17 Issue 1 Pages 1-2
Published: February 28, 1998
Released on J-STAGE: March 07, 2011
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[in Japanese]1998 Volume 17 Issue 1 Pages 6
Published: February 28, 1998
Released on J-STAGE: March 07, 2011
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[in Japanese]1998 Volume 17 Issue 1 Pages 7-12
Published: February 28, 1998
Released on J-STAGE: March 07, 2011
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[in Japanese]1998 Volume 17 Issue 1 Pages 13-17
Published: February 28, 1998
Released on J-STAGE: March 07, 2011
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[in Japanese]1998 Volume 17 Issue 1 Pages 18-21
Published: February 28, 1998
Released on J-STAGE: March 07, 2011
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Moon-su KWAK, Hitoshi NISHIMURA1998 Volume 17 Issue 1 Pages 22-27
Published: February 28, 1998
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSThe Green-function method provides a powerful tool for analyzing diffraction and multiple reflection of waves. In applying this method to coastal wave analysis, however, the accuracy has been often reduced because of irrational open-boundary conditions imposed. This paper presents the most rigorous formulation of continuation conditions, and validity as well as significance of the revised method is demonstrated through trial computation of wave diffraction around a breakwater gap.View full abstractDownload PDF (2088K) -
Shin-ichi OIDE, Iwao HOSOKAWA, Kiyoshi YAMAMOTO1998 Volume 17 Issue 1 Pages 28-44
Published: February 28, 1998
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSDirect numerical simulation (DNS) of decaying isotropic turbulence with a passive scalar, say temperature, has been done on 5123 grids of the Numerical Wind Tunnel at National Aerospace Laboratory. The fields of vorticity and temperature gradient are visualized to clarify the process of formation of their local structures such as “worms” and sheets. We show that the circulation around a worm is close to that around a Burgers vortex even though the former is very far from the latter in detailed structure. The self-similar structures of energy dissipation and scalar dissipation in our DNS are visualized for intuitive understanding. It is found that the multifractal structure of energy dissipation is almost invariant in the process of decay. The joint multifractal of energy and scalar dissipations is established on the DNS basis.View full abstractDownload PDF (15621K) -
Takanori UCHIDA, Yuji OHYA1998 Volume 17 Issue 1 Pages 45-56
Published: February 28, 1998
Released on J-STAGE: March 07, 2011
JOURNAL FREE ACCESSStably stratified flows past a two-dimensional hill in a channel of finite depth are analyzed numerically by using a newly-developed multi-directional finite-difference method at a Reynolds number of 2000 based on the freestream velocity U and the obstacle's height h. Attention is focused on unsteady characteristics of the flow around the hill for the cases of 1<K (=NH/πU) 2 (strong stratification) where N and H are the buoyancy frequency and the domain depth. The numerical results clarify that the periodical change in the flow around the hill, which leads to a persistent Cd oscillation, is caused by the detaching of the upstream advancing columnar disturbance with mode n=1. Furthermore, it is shown that the unsteadiness in the flow is strongly affected by the Reynolds number, the blockage ratio H/h and the body shape.View full abstractDownload PDF (2350K)
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