Vortical structure and turbulence control in rotating fluids

旋转流体中的涡流结构和湍流控制

• 批准号: 08650080
• 负责人: YANASE Shinichiro
• 金额: $ 1.41万
• 依托单位: Okayama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650080/
• 关键词: turbulence; control; uniform rotation; Coriolis force; vortical structure; cyclonic vortex; vortex layer; shear flow; 渦層; コリオリカ; 剪断流; 回転系; 乱流制御; 曲がり管; 旋回流; 管抵抗; ベンド; 二次流

First the results obtained by the head investigator are described. Three papers have been published. Two of them are on the bifurcation phenomena in the flow through a curved duct, where the competitive effect of the Coriolis force and the centrifugal force associated with the duct curvature is studied. It is found that when these effect are balanced, the flow flux is maximum. The other is on the vortical structure in the rotating fluids. In DNS without mean shear flow, it is found that the resonant interaction plays an important role in the two-dimensionalization process of turbulence. In the simulations with mean shear flow, it is found that a coherent structure develops when the background absolute vorticity is zero. Next the results obtained by the sub-investigator are described, By the experimental investigation of turbulent curved pipe flow, it is found that the injection of swirling flow at the inlet of the pipe reduces the drag appreciably, which will contribute industrial application.

首先描述了首席研究员获得的结果。发表了三篇论文。其中两个是在通过一个弯曲的管道，在那里的科里奥利力和离心力与管道曲率的竞争效应的影响进行了研究的流动中的分叉现象。结果表明，当这些影响平衡时，流量最大。二是旋转流体中的旋涡结构。在无平均剪切流的DNS中，发现共振相互作用在湍流的二维化过程中起着重要的作用。在平均切变流的模拟中，发现当背景绝对涡度为零时，出现了一个相干结构。通过对湍流弯管流动的实验研究，发现在弯管入口处注入旋流可以明显地减小阻力，这将有助于工业应用。

项目成果

M.Tanaka,S.Yanase,S.Kida & G.Kawahara: "Vortical structures in rotating uniformly sheared turbulence" Flow,Turbulence and Combustion. (1999)

田中先生、柳濑先生、木田先生

T.Takami,S.Yanase,Y.Maruyama & Y.Araki: "Drag reduction of turbulent flows in a curved pipe due to the swirling constability" The Fourth KSME-JSME Fluid Engineering Proceedings. 665-668 (1998)

T.Takami,S.Yanase,Y.Maruyama

M.Tanaka, S.Yanase, S.Kida, G.Kawahara: "Vortical structures in rotating uniformly sheared turbulence" Flow, Turbulence and Combustion. (1999)

M.Tanaka、S.Yanase、S.Kida、G.Kawahara：“旋转均匀剪切湍流中的涡流结构”流动、湍流和燃烧。

K.Yamamoto, S.Yanase, M.M.Alan: "Flow through a rotating curved duct with square cross-section" J.Phys.Soc.Japan. Vol.68(4). (1999)

K.Yamamoto、S.Yanase、M.M.Alan：“流过具有方形横截面的旋转弯曲管道”J.Phys.Soc.Japan。

K.Yamamoto, S.Yanase & M.M.Alam: "Axially invariant laminar flow in a helical duct of square cross-section" Indian J.pure appl.Math.30 (3). (1999)

山本 K、柳濑 S