B14-063 NUMERICAL SIMULATION OF DRAG REDUCTION BY MICROELEMENTS ADDED IN A TURBULENT CHANNEL FLOW

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概要

• 論文の詳細を見る

• To investigate the mechanism of drag reduction by addition of small elements in turbulent flows of Newtonian fluid, a direct numerical simulation (DNS) of turbulent channel flow has been carried out. Three types of element model (single sphere, rigid dumbbell (two beads are connected by a rigid rod), viscoelastic dumbbell (two beads are connected by a spring and a dashpot) are used to know the essential function of the small element to reduce the drag in turbulent channel flow. The DNS results with dumbbell models show the drag reduction, while the drag increases with the single sphere model. The effects of parameters of the element on the flow features are investigated. In addition the mechanism of the stress deficit by the elements is discussed. Finally, it is shown the primary mechanism of drag reduction by a dumbbell element its to suppress the vortex stretching in the streamwise direction.

• 一般社団法人日本機械学会の論文
• 2003-11-30

著者

• Kuroda Akiyoshi

  Div. Of Mechanical Science Grad. School Of Engng. Hokkaido University

• Kuroda Akiyoshi

  Div. Of Mech. Sci. Hokkaido University

• SAIDO Shuhei

  Div. of Mechanical Science, Grad. School of Engng., Hokkaido University

• KUDO Kazuhiko

  Div. of Mechanical Science, Grad. School of Engng., Hokkaido University

• Saido Shuhei

  Div. Of Mechanical Science Grad. School Of Engng. Hokkaido University

• Kudo Kazuhiko

  Div. Of Mechanical Science Grad. School Of Engng. Hokkaido University

• Kudo Kazuhiko

  Div. Of Mech. Sci. Hokkaido University

関連論文

• B14-063 NUMERICAL SIMULATION OF DRAG REDUCTION BY MICROELEMENTS ADDED IN A TURBULENT CHANNEL FLOW
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