Transactions of the Visualization Society of Japan
Online ISSN : 1346-5260
ISSN-L : 1346-5252
Volume 26, Issue 1
Displaying 1-2 of 2 articles from this issue
  • Sayaka HAIDA, Akihiro TORISU, Kenichi UMEZAWA, Ryuhei YAMAGUCHI, Hiros ...
    2006 Volume 26 Issue 1 Pages 1-5
    Published: 2006
    Released on J-STAGE: January 31, 2006
    JOURNAL FREE ACCESS
    In the present paper, the flow structure within five kinds of aneurysm models at different stage in the anterior communicating artery (ACoA) has been visualized in laminar steady flow by PIV. ACoA forming circle of Willis is one of the predilection sites of the cerebral aneurysm. Since the vascular disease such as aneurysm is apt to occur at the site where the flow impinges, the flow pattern is closely related to the initiation, development, and rupture of aneurysm. The relation between flow pattern and aspect ratio AR (= depth/ neck diameter of aneurysm) which indicates the progressive process of aneurysm is studied by flow visualization from the viewpoint of hemodynamics.
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  • Masahiro NAKASHIMA, Akira RINOSHIKA, Takahide TABATA, Masashi NISHIDA, ...
    2006 Volume 26 Issue 1 Pages 6-12
    Published: 2006
    Released on J-STAGE: January 31, 2006
    JOURNAL FREE ACCESS
    The experimental investigation of the water jet flow issuing from the circular pipe with the fluttering fins is addressed. Especially, the effects of the fluttering fins on the jet diffusion were studied. The measurements of the flow visualization were performed by the system, which was composed of the dual-pulse Nd:YAG-laser, the CCD-camera and the high speed camera. By analyzing the velocity distributions obtained from PIV, the jet widths with or without the fluttering fins were compared. It has been clarified that the jet diffusion is enhanced due to the influence of the fluttering fins. Furthermore, the continuous wavelet transform and the wavelet multi-resolution analysis were respectively applied to analyzing the fluctuating velocity and the image information obtained in the section normal to the jet flow, and the flow structures were decomposed into wavelet components of various scales. It has been found that the flow structures of the jet flow with the fluttering fins are different from that without them.
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