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Simultaneous measurement of fluctuating velocity and pressure in the near wake of a circular cylinder

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Abstract

Simultaneous measurement of fluctuating velocity and pressure by a static-pressure probe and a hot-wire probe was performed in the near wake of a circular cylinder, in order to strengthen reliability of the measurement technique. Effect of geometry of the static-pressure probe was systematically investigated, and validity of the measurement results was addressed by quantitative comparison with reference data by a large-eddy simulation. Interference between the probes was found to mainly depend on the diameter of the pressure probe and only weakly on the length. A certain time lag between the velocity and pressure signals was detected in the experiment, and the measurement results of velocity–pressure correlation \(\overline{up}\) and \(\overline{vp}\) obtained with the correction of the time lag were in good agreement with the computational results. It was also found that the measurement of \(\overline{vp}\) is extremely sensitive to a small time lag between the velocity and pressure signals, while that of \(\overline{up}\) is not.

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Acknowledgments

The authors are very grateful to Prof. Kuniaki Toyoda of Hokkaido Institute of Technology for his shrewd advices. We are also grateful to Assoc. Prof. Koji Fukagata of Keio University, Japan, for invaluable discussions. A part of this research was financially supported through Grant-in-Aid for Research Fellow (No. 23-3769) of Japan Society for the Promotion of Science (JSPS) and Global COE program of Center for Education and Research of Symbiotic, Safe and Secure System Design.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama-shi, Kanagawa, 223-8522, Japan

    Takuya Kawata & Shinnosuke Obi

  2. Department of Mechanical and Aerospace Engineering, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, 152-8550, Japan

    Yoshitsugu Naka

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  1. Takuya Kawata
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  2. Yoshitsugu Naka
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  3. Shinnosuke Obi
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Correspondence to Takuya Kawata.

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Kawata, T., Naka, Y. & Obi, S. Simultaneous measurement of fluctuating velocity and pressure in the near wake of a circular cylinder. Exp Fluids 55, 1731 (2014). https://doi.org/10.1007/s00348-014-1731-7

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  • DOI: https://doi.org/10.1007/s00348-014-1731-7

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