| タイトル | Numerical simulation of upstream disturbance on flows around a slender body |
| 著者（英） | Tobak, Murray; Degani, David |
| 著者所属（英） | NASA Ames Research Center |
| 発行日 | 1993-07-01 |
| 言語 | eng |
| 内容記述 | Numerical solutions of the thin-layer approximation of the compressible Navier-Stokes equations have been obtained for flows around an ogive-cylinder body with and without a small fixed disturbance placed upstream of the body tip. Locating the disturbance at positions in the flow field upstream of the tip provokes the same range of behavior of the asymmetric flow that was numerically produced earlier by use of a geometrical disturbance on the body tip. Results remain consistent with the presence of a convective instability mechanism, and demonstrate the potential for a precise mapping of the body's receptivity to fixed disturbances in the flow field. Numerical solutions were also obtained for the flow-field responses to impulsive upstream disturbances to determine whether there is a growing response to an asymmetric impulsive disturbance that is consistent with presence of a convective instability mechanism. Results for surface pressure are interpreted with the aid of a mathematical model. The model suggests that the observed growth of surface pressure gradient with time and distance along a ray in response to an asymmetnc impulsive disturbance is in accord with the solution of a Ginzberg-Landau equation, with distinguishing features of the solution being consistent with the convective instability mode of behavior. |
| NASA分類 | AERODYNAMICS |
| レポートNO | 93A48150
AIAA PAPER 93-2956 |
| 権利 | Copyright |
