| タイトル | On turbulent spots in plane Poiseuille flow |
| 本文（外部サイト） | http://hdl.handle.net/2060/19920015893 |
| 著者（英） | Henningson, Dan S.; Kim, John |
| 著者所属（英） | NASA Ames Research Center |
| 発行日 | 1992-02-01 |
| 言語 | eng |
| 内容記述 | Turbulence characteristics inside a turbulent spot in plume Poiseuille flow are investigated by analyzing a data base obtained from a direct numerical simulation. The spot is found to consist of two distinct regions - a turbulent area and a wave area. The flow inside the turbulent area has a strong resemblance to that found in the fully developed turbulent channel. Suitably defined mean and rms fluctuations as well as the internal shear layer structures are found to be similar to the turbulent counterpart. In the wave area, the inflexional mean spanwise profiles cause a rapid growth of oblique waves, which break down to turbulence. The breakdown process of the oblique waves is reminiscent of the secondary instability observed during transition to turbulence in channel and boundary layer flows. Other detailed characteristics associated with the Poiseuille spot are presented and are compared with experimental results. |
| NASA分類 | FLUID MECHANICS AND HEAT TRANSFER |
| レポートNO | 92N25136
NASA-TM-102836
A-90192
NAS 1.15:102836 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/127074 |
