1054 TURBULENT STRUCTURE IN A BOUNDARY LAYERE DEVELOPED OVER THREE-DIMENSIONAL ROUGH WALLS

• Tomoya Murakami

  Graduate School of Engineering, Yamaguchi University

• Shinsuke Mochizuki

  Graduate School of Engineering, Yamaguchi University

• Takatsugu Kameda

  Dept. of Mechanical Engineering, Kinki University

抄録

Turbulent structure in a boundary layer developed over two different types of three-dimensional rough walls, namely, cavity and protrusion types have been investigated to understand effect of the geometrical feature on the turbulent statistics. Over the protrusion type of rough wall, the local skin friction coefficient is much larger than those of two-dimensional and the cavity type rough wall flows. As momentum thickness Reynolds number increases, the local skin friction coefficient tends to almost the same value over the two-dimensional and cavity type rough walls. Deficit in mean velocity profiles is the largest over the protrusion type of rough wall and takes almost the same value over the two-dimensional and cavity type rough walls. With higher-order moments of fluctuating velocity components, coherent vortical motions near the wall such as hairpin or necklace vortices are discussed to describe turbulent production and diffusion mechanisms in the near wall for the three-dimensional roughness.

収録刊行物

• Jets, wakes and separated flows : proceedings of International Conference on Jets, Wakes and Separated Flows, ICJWSF

  Jets, wakes and separated flows : proceedings of International Conference on Jets, Wakes and Separated Flows, ICJWSF 2013.4 (0), _1054-1_-_1054-6_, 2013

  一般社団法人 日本機械学会

詳細情報

• CRID: 1390001205880691200
• NII論文ID: 110009962659
• DOI: 10.1299/jsmeicjwsf.2013.4._1054-1_
• ISSN: 24242888
• Web Site: https://www.jstage.jst.go.jp/article/jsmeicjwsf/2013.4/0/2013.4__1054-1_/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可