Conference Paper 3次元複雑形状周りのRANS 解析へ向けた直交格子ソルバUTCart の機能拡張

玉置, 義治  ,  今村, 太郎  ,  Tamaki, Yoshiharu  ,  Imamura, Taro

To simulate flows around complex geometries, an improvement on the Cartesian-grid-based flow solver UTCart is proposed, which enables UTCart to handle a grid with variable cell sizes on the wall. UTCart uses an immersed boundary method with a wall function for the wall boundary condition in turbulent flow simulations. The boundary condition requires a cutoff distance that is defined as the grid size assigned at the nearest wall multiplied by a constant. A large computational effort was needed to determine the cutoff distance because every cell in the computational domain must detect the nearest wall. Thus, a new method based on an advection equation to calculate the cutoff distance is developed. Using UTCart, turbulent flows around the JAXA high-lift configuration standard model are simulated. The surface features, including the small gaps between the wing and the flap, are well resolved in the generated grid that has approximately 110 million cells. In the computational results, the lift coefficients and the surface pressure coefficients show a good agreement with the experimental data, especially at the low angles of attack.
会議情報: 第49回流体力学講演会/第35回航空宇宙数値シミュレーション技術シンポジウム (2017年6月28日-30日. 国立オリンピック記念青少年総合センター), 渋谷区, 東京
形態: カラー図版あり
Meeting Information: 49th Fluid Dynamics Conference /the 35th Aerospace Numerical Simulation Symposium (June 28-30, 2017. National Olympics Memorial Youth Center), Shibuya-ku, Tokyo, Japan
Physical characteristics: Original contains color illustrations

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