| タイトル | Numerical Simulations of Unsteady Low-Reynolds-Number Flows Over the APEX Airfoil |
| 著者（英） | Zhong, Xiao-Lin; Tatineni, Mahidhar |
| 著者所属（英） | California Univ. |
| 発行日 | 1998-01-01
1998 |
| 言語 | eng |
| 内容記述 | Laminar and transitional separation bubbles are an important feature of low-Reynolds-number flows over airfoils. The separation bubbles are unsteady and have a significant impact on the aerodynamic properties of the airfoils. In this paper unsteady low-Reynolds-number separated flows over the APEX airfoil are calculated using a Navier-Stokes solver. The numerical results show the presence of unsteady separation bubbles in the flowfield. An analysis of the numerical results shows that flowfield disturbances are amplified significantly in the separation bubble, leading to periodic vortex shedding. A linear stability analysis of the separated boundary layer is performed and the results show that the dominant wavenumber and frequency in the numerical simulations agree with the most unstable wavenumber and frequency from the linear stability analysis. The numerical results also show the growth and interaction of disturbance waves in the separation bubble. For transonic flows over the APEX airfoil, the calculations show that the presence of shocks causes significant changes in the separation location and consequently, the overall flowfield. |
| NASA分類 | Aerodynamics |
| レポートNO | AIAA Paper 98-0412 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/343788 |
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