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titleSimulation of separation using coarse grid
Other Title粗い格子による剥離流の数値計算
Author(jpn)桑原 邦郎; 南本 和秀; Bethancourt, Angel; 小紫 誠子
Author(eng)Kuwahara, Kunio; Minamimoto, Kazuhide; Bethancourt, Angel; Komurasaki, Satoko
Author Affiliation(jpn)計算流体力学研究所; 計算流体力学研究所; 計算流体力学研究所; 日本大学 理工学部 数学科
Author Affiliation(eng)Institute of Computational Fluid Dynamics; Institute of Computational Fluid Dynamics; Institute of Computational Fluid Dynamics; Nihon University Department of Mathematics, College of Science and Technology
Issue Date2007-12-28
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication title境界層遷移の解明と制御研究会講演論文集 第39回
Proceedings of the 39th JAXA Workshops on Investigation and Control of Boundary-Layer Transition
Start page5
End page8
Publication date2007-12-28
AbstractThis paper introduces a computational technique to compensate for the added numerical diffusion that is generated when uniform Cartesian coordinates are used to describe the flow around bluff bodies. Because of the staircase-like representation of the surface object, it was found that the added surface 'roughness' causes larger than expected separation region for some test cases (flow around a sphere, and flow around a cylindrical body). In order to control the velocity profile in the boundary layer, a new parameter blvr (boundary layer velocity ratio) is defined, and it is used to set the negative value of the viscosity along the surface. Extensive visualizations of flow past bluff bodies are performed using the present technique. Numerical solutions of the governing Navier-Stokes equations are carried out in a uniform Cartesian coordinates using a multi-directional finite difference scheme with a third-order upwinding. No explicit turbulence model is incorporated into the model, and the dependence of the solution on the blvr parameter is investigated.
DescriptionJAXA Special Publication
Keywordsboundary layer transition; separated flow; boundary layer separation; computerized simulation; Cartesian coordinate; bluff body; velocity distribution; surface roughness effect; numerical flow visualization; three dimensional flow; 境界層遷移; 剥離流; 境界層剥離; 計算機シミュレーション; 直交座標; 截頭体; 速度分布; 粗面効果; 計算流動可視化; 3次元流
Document TypeConference Paper
JAXA Category特別資料
Report NoJAXA-SP-07-009

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