Chiba University Graduate School
Chiba University Department of Mechanical Engineering, Faculty of Engineering
Chiba University Graduate School
Chiba University Department of Mechanical Engineering, Faculty of Engineering
出版者
航空宇宙技術研究所
出版者（英）
National Aerospace Laboratory (NAL)
雑誌名
航空宇宙技術研究所特別資料: 第11回航空機計算空気力学シンポジウム論文集
雑誌名(英)
Special Publication of National Aerospace Laboratory: Proceedings of the 11th NAL Symposium on aircraft computational aerodynamics
巻
22
ページ
163 - 168
発行年
1994-03
会議概要（会議名, 開催地, 会期, 主催者等）
航空宇宙技術研究所 10-11 Jun. 1993 東京 日本
会議概要（会議名, 開催地, 会期, 主催者等）（英）
National Aerospace Laboratory 10-11 Jun. 1993 Tokyo Japan
In the present paper a numerical study is conducted for viscous two-dimensional incompressible flow over wavy walls. The employed method is an application of the Boundary Fitted Coordinate for phi-omega method. In the phi - omega method the finite differencing of the convection terms in Navier-Stokes equations employs Kawamura and Kuwahara scheme, and the time integration is performed with M.O.L. (Method Of Lines) method. The model problem is the flow past over wavy balls. A sequential protuberance of height 2a and wavelength lambda is considered. In the numerical experiments. 2a/lambda = 0.1, 0.2, 0.4, and Reynolds numbers R(sub e) = 1000, 2000, 3000, 4000. The reason for choosing this problem is that, by suitable choice of 2a/lambda, and Reynolds number, it is possible to examine flows with different separation patterns. It is the flow past over wavy walls, with separation and reattachment points not known a priori. The flow features of particular concern, both from numerical as bell as physical viewpoints. are the adjustment of the initially fully developed flow to a spatially periodic condition and, for specific amplitudes, the occurrence of repeated separation bubbles. Such configurations are of interest in drag reduction and heat-transfer enhancement. In the application of CFD (Computational Fluid Dynamics) for walls with sequential protuberances, the effect of alternating favorable and adverse pressure gradients should be analyzed, which correspond to convex and concave surface curvatures on the ball.
波状壁に沿う流れの構造と抵抗
nalsp0022027.pdf
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