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Statistical properties of a d-type rough wall turbulent boundary layer : low Reynolds number effect

Memoirs of the Faculty of Engineering, Yamaguchi University Volume 44 Issue 1 Page 1-8
published_at 1993-10
KJ00000156942.pdf
[fulltext] 581 KB
Title
d形粗面境界層の統計的性質 : 低レイノルズ数の効果
Statistical properties of a d-type rough wall turbulent boundary layer : low Reynolds number effect
Creators Mochizuki Shinsuke
Creators Osaka Hideo
Source Identifiers
Statistical properties of d-type rough wall boundary layer in a transitionally and a fully rough regime have been investigated experimentally. Probability density distributions and higher-order moments of the u-and v-fluctuating velocity components were measured in the momentum thickness Reynolds number range of R_θ=700-5140. Existence of the local energy equilibrium was recognized in the inner layer at the whole Reynolds number range. Difference of the turbulent structure among smooth, d-type rough and k-type rough wall flows can be found in the profiles of turbulent energy production and dissipation near the wall. It is seen that the difference of smooth wall flow and d-type rough wall flow and also the Reynolds number dependence in the wake component of the mean velocity profile can be fairly explained in terms of the triple velocity correlations involved in the turbulent diffusion terms for the Reynolds shear stress. The effective velocity of turbulent diffusion for the turbulent energy and Reynolds shear stress fluxes were evaluated.
Languages jpn
Resource Type departmental bulletin paper
Publishers 山口大学工学部
Date Issued 1993-10
File Version Version of Record
Access Rights open access
Relations
[ISSN]0372-7661
[NCID]AN00244228
Schools 工学部