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Laboratory simulations of atmospheric dynamics in the rotating fluid annulus experiments.

旋转流体环空实验中大气动力学的实验室模拟。

基本信息

批准号：
07640582
负责人：
TAJIMA Toshihiko
金额：
$ 1.47万
依托单位：
TOYAMA NATIONAL COLLEGE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640582/
关键词：
Lagrangian trajectory rotating annulus fluid experiment baroclinic wave chaos lage-scale circulation of the atmosphere atmospheric dynamics

项目摘要

In the recent ten years it has become gradualy acknowledged to be fundamentarlly importent in fluid dynamics, meteorological and oceanographical problems to investigate Lagrangian motions in fluids. Only a few such experimental studies, however, have veen so far done. In this project we have developed experimental method to observe 3-D Lagrangian trajectories in the rotating fluid annulus which is designed to produce baroclinic waves found in the large scale circulation of the atmosphere in the mid-latitud of the earth. Neutrally buoyant tracer particles are made from fluorescent matter and illuminated by ultraviolet light in the dark room to detect their position by two videocameras. There our early developed apparatus of double rotating turn-tables was used to track a tracer particle. In the first year (1995) of this project we developed the method to make tracer particles that are buoyant for a long time. Thus, we succeeded in obtaining the data of the particle trajectories for the … More total time of more than ten hours. The result has been reported at Physical Society of Japan, Meteorological Society of Japan, Fluid Dynamics Society of Japan and Visualization Society. The paper which describes these experiments will be soon published. New discovery in our experiments is a significant difference of the Lagrangian motions between the wavenumber-4 and 5 wave. This is very important in the meteorological studies because it suggest that the mechanism of the heat transport is different between the wavenumbers. Though a part of our experimental result is consistent with the result of the numerical simulation done by Sugata and Yoden, our data were insufficient for getting the reliable conclution. We realized neccesity of performing more than 10 hours tracking in one experiment. In the second year (1996) of this project we developed a system of tracking a tracer particle automatically with a personal comuter in order to make it very easy to perform long term trackings (for more than 10 hours). Furthermore we made microcapsuls of ultraviolet luminous dye as tracer particles with the cooporation of Threetech Debys Co. and tested them in experiments so that they were proved to be very suitable for tracers. We have a plan to carry out future experiments after reinvestigating the physical conditions. Less

近十年来，人们逐渐认识到流体中拉格朗日运动在流体动力学、气象学和海洋学问题中的重要性。然而，到目前为止，只有少数这样的实验研究已经完成。在本项目中，我们发展了在旋转流体环中观测三维拉格朗日轨迹的实验方法，该旋转流体环设计用于产生在地球中纬度大气大尺度环流中发现的斜压波。中性浮力示踪粒子由荧光物质制成，在暗室中用紫外线照射，通过两台摄像机检测它们的位置。在那里，我们早期开发的双旋转转盘装置被用来跟踪示踪粒子。在该项目的第一年（1995年），我们开发了制造长时间漂浮的示踪粒子的方法。因此，我们成功地获得了粒子轨迹的数据， ...更多信息总时间超过十个小时。该结果已在日本物理学会、日本气象学会、日本流体动力学学会和可视化学会发表。描述这些实验的论文将很快发表。实验中的新发现是4波和5波的拉格朗日运动有明显的差异。这在气象研究中非常重要，因为它表明波数之间的热量传输机制是不同的。虽然我们的实验结果与Sugata和Yoden的数值模拟结果有部分一致，但我们的数据不足以得出可靠的结论。我们意识到在一个实验中进行超过10小时跟踪的必要性。在该项目的第二年（1996年），我们开发了一个系统的跟踪示踪粒子自动与个人计算机，以使它很容易进行长期跟踪（超过10小时）。此外，我们还与Threetech Debys公司合作，制备了紫外发光染料微胶囊作为示踪粒子，并进行了实验测试，证明它们非常适合作为示踪剂。我们计划在重新调查物理条件后进行未来的实验。少