@techreport{oai:jaxa.repo.nii.ac.jp:00041396,
 author = {Amalia, Ema and 久保田, 弘敏 and Amalia, Ema and Kubota, Hirotoshi},
 month = {Dec},
 note = {航空宇宙技術研究所 27-29 Sept.2000 東京 日本, National Aerospace Laboratory 27-29 Sept.2000 Tokyo Japan, 3次元境界層の遷移過程を把握するためSIMPLE法を用いて片揺れ円筒周辺の数値シミュレーションを行った。先ず、既報研究で使用した速度による定常条件を評価し、次いで、非定常条件についても評価した。定常条件に対しては一般化座標で、また非定常条件に対しては円筒座標で非圧縮性ナビエ・ストークス方程式を用いた。定常条件の場合には、レイノルズ数220,000の30m/secの主流速度および半円筒型の格子サイズ200×100×60の条件を用いた。TDMA(時分割多元接続)を用いて有限差分方程式を解いた。円筒表面近傍の速度場を検討し、代表的な境界層分布を得た。非定常条件の場合の評価については、円筒型座標形内のナビエ・ストークス方程式に2次差分スキームを適用した場合には、収束結果を得なかった。座標項に対して3次風上スキーム、ならびに拡散項に対して4次中心差分スキームを適用して収束結果を得た。, The numerical simulation around a yawed circular cylinder was carried out using SIMPLE (Semi-Implicit Method for Pressure-Linked Equation) method in order to understand the transition process of three-dimensional boundary layers. First, the steady conditions with velocity used in the previous reports were evaluated, and then unsteady conditions ware also evaluated. The incompressible Navier-Stokes equation was used in generalized coordinate for steady conditions as well as in cylindrical coordinate for unsteady conditions. The conditions of free stream velocity of 30 m/sec with Reynolds number 220,000 and grid size of 200 x 100 x 60 for a half cylinder were used for case of the steady condition. TDMA (Time Division Multiple Access) was used for solving finite difference equations. Velocity field near surface of circular cylinder was investigated, and the typical profile of boundary layer was obtained. For the evaluation of the case of unsteady conditions, when the second order difference scheme was applied to Navier-Stokes equation in cylindrical coordinate form, no convergence results were obtained. The convergence results were obtained by applying the third order upwind scheme for coordinate term, and the fourth order central difference scheme for diffusive term., 資料番号: AA0028637010, レポート番号: NAL SP-48T},
 title = {Numerical simulation of boundary layers around a circular cylinder},
 year = {2000}
}