2 0 0 0 OA 流体素子内3次元流れの数値実験
- 著者
- 堂田 周治郎 逢坂 一正 ドウタ シュウジロウ オオサカ カズマサ Shujiro Dohta Kazumasa Ohsaka
- 雑誌
- 岡山理科大学紀要. A, 自然科学
- 巻号頁・発行日
- vol.17, pp.57-74, 1981
In this paper, by means of the numerical experiment, the laminar jet behaviour in an attachment fluidic device with small aspect ratio is investigated. The numerical solution for the three-dimensional, imcompressible, unsteady and viscid flow is calculated by solving the primitive Navier-Stokes equations by use of the predictor-corrector method. The results obtained can be summarized as follows : 1. In the case of smaller aspect ratio, the numerical solution can be obtained to the extent of the higher Reynolds Number. 2. Near the bounding plates more fluid flows into the separation bubble than that at midplane and then this flows toward midplane, and finally is entrained by the main flow. 3. The flow along the side wall, also, enters the bubble near the bounding plates. This results in a longer attachment distance near the bounding plates.
1 0 0 0 OA 流体素子内3次元流れの数値実験 : 噴流の挙動に及ぼすノズルの影響
- 著者
- 堂田 周治郎 逢坂 一正 立石 佳男 ドウタ シュウジロウ オオサカ カズマサ タテイシ ヨシオ Shujiro Dohta Kazumasa Ohsaka Yoshio Tateishi
- 雑誌
- 岡山理科大学紀要. A, 自然科学
- 巻号頁・発行日
- vol.19, pp.131-146, 1983
The purpose of this study is to investigate the effects of the nozzle shape on the jet behaviour by means of the numerical experiment. The calculation was carried out for the three types of the fluidic devices that have different length of the nozzle throat. The flow was regarded as unsteady, three-dimensional, incompressible, viscous and laminar flow, and the primitive Navier-Stokes equations was calculated by use of predictor-corrector method. The obtained results are summerized as follows : 1. For a small aspect ratio, the jet attaches strongly when the length of the nozzle throat is shortened. On the other hand, for a large aspect ratio, it can be considered that there is no effect of the length of the nozzle throat. 2. The flow shows the symmetrical behaviour with respect to the nozzle, that is, in the upper stream, there exists a fluid flow from the midplane to the bottom bounding wall, and in the downstream, there exists a fluid flow from the bottom wall to the midplane. 3. When the length of the nozzle throat becomes shorter, the jet behaves in the similar manner to the case of higher Reynolds Number. This is closely related to the velocity distribution at the nozzle exit.