REYNOLDS NUMBER DEPENDENCE AND INVARIANT ASSUMPTION IN TURBULENT BOUNDARY LAYER

Nakamura, Ikuo; Miyachi, Kei; Kushida, Takehiro; Tsuji, Yoshiyuki

Turbulence and Shear Flow Phenomena -1 First International Symposium

ISBN 打印: 1-56700-135-1

REYNOLDS NUMBER DEPENDENCE AND INVARIANT ASSUMPTION IN TURBULENT BOUNDARY LAYER

Ikuo Nakamura Department of Mechanical Engineering, Meijyo University, Tempaku-ku, Nagoya City, Aichi, Japan, 464-8502

Kei Miyachi Department of Energy Engineering and Science, Nagoya University Chikusa-ku Furo-cho, Nagoya City, Aichi, Japan, 464-8603

Takehiro Kushida Department of Mechanical Engineering, Nagoya University, Chikusa-ku, Furo-cho, Nagoya, 464-8603, JAPAN

Yoshiyuki Tsuji KTH Mechanics, Royal Institute of Technology, 100 44 Stockholm, Sweden; Department of Energy Science and Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8503, Japan

Abstract

The logarithmic velocity region is considered in zero-pressure-gradient turbulent boundary layers. We propose a new definition of log-law region with using the probability profiles of stream wise velocity fluctuation. The measure called Kullback Leibler divergence is applied to distinguishing the probability profiles. The ratio of boundary layer thickness, δ, and the upper end of logarithmic region, δ_L, is investigated, and also the Reynolds number dependence of pdf profile is mentioned.

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