| タイトル | Numerical modeling of turbulent flow in a channel |
| 本文（外部サイト） | http://hdl.handle.net/2060/19840005121 |
| 著者（英） | Oppenheim, A. K.; Sherman, F. S.; Dai, Y. W.; Ghoniem, A. F. |
| 著者所属（英） | California Univ. |
| 発行日 | 1983-03-01 |
| 言語 | eng |
| 内容記述 | Two-dimensional incompressible turbulent flow in a channel with a backward-facing step was studied numerically by Chorin's Random Vortex Method (RVM), an algorithm capable of tracing the action of elementary turbulent eddies and their cumulative effects without imposing any restrictions upon their motions. The step occurs in one side of a channel with otherwise flat, parallel walls; its height equals 1/3, 1/4 or 1/5 the width of the channel downstream. The main objective was to investigate the behavior of the large-scale turbulent eddies in a flow and the flow characteristics in the separated shear layer, the reattached zone, and the rebuilding boundary layer after reattachment. The unsteady vorticity field and the distribution of time-averaged turbulent statistics were obtained. The effects of expansion step height and initial boundary layer state were also studied. Comparisons were made with the available experimental results. The agreement is satisfactory in the velocity profiles and in the reattachment length, and fairly good in the turbulence profiles. Also a mechanism of the development of the reattaching turbulent flow was suggested by the numerical results. |
| NASA分類 | AIRCRAFT PROPULSION AND POWER |
| レポートNO | 84N13189
DOE/NASA/0131-2
NAS 1.26:168278
NASA-CR-168278 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/160960 |
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