2021-10-27T20:09:16Zhttps://jaxa.repo.nii.ac.jp/?action=repository_oaipmhoai:jaxa.repo.nii.ac.jp:000064572021-03-17T09:20:15Z00009:00789:01067:0107301887:01891
遷音速フラッターシミュレーションにおける陰解法の時間刻み幅選定基準についてjpn航空機設計空力特性遷音速フラッタ遷音速飛行CFD非定常空気力学翼型振動Baldwin-Lomax乱流モデル陰解法時間刻み幅aircraft designaerodynamic characteristictransonic fluttertransonic flightCFDunsteady aerodynamicsairfoil oscillationBaldwin-Lomax turbulence modelimplicit methodtime stepping sizehttp://id.nii.ac.jp/1696/00006451/Conference PaperEffect of the time stepping size in the implicit method for the transonic flutter simulations寺島, 洋史藤井, 孝蔵Terashima, HiroshiFujii, Kozo宇宙航空研究開発機構Japan Aerospace Exploration Agency (JAXA)宇宙航空研究開発機構特別資料: 航空宇宙数値シミュレーション技術シンポジウム2004論文集 = JAXA Special Publication: Proceedings of Aerospace Numerical Simulation Symposium 2004JAXA-SP-04-0121051102005-03-25One criterion that determines time stepping size in the implicit time integration method is given for accurate and effective transonic flutter simulations. Transonic flows over two-dimensional forced oscillating airfoils with several reduced frequencies are first investigated for constructing a criterion for selecting the time stepping size, and then two and three-dimensional transonic flutter simulations are performed for evaluating the criterion. Results for the forced oscillating airfoil indicate that unsteady aerodynamic forces converge in a constant value as the time stepping size decreases and the time stepping size required the convergence of unsteady aerodynamic force depends on the reduced frequency. From these results, it turns out that 4,000 integration steps during one cycle of airfoil oscillations are enough for the estimation of the unsteady aerodynamic forces at any reduced frequency. The time stepping size is automatically decided by setting 4,000 integration steps during one cycle of airfoil oscillations. Results for two and three-dimensional transonic flutter simulations show that flutter boundaries can be accurately and effectively calculated based on the criterion.1349-113xAA11984031https://jaxa.repo.nii.ac.jp/?action=repository_action_common_download&item_id=6457&item_no=1&attribute_id=31&file_no=1資料番号: AA0048469017レポート番号: JAXA-SP-04-0122020-01-16