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Integrated Computational and Experimental Method for Flow Problems

流动问题的综合计算与实验方法

基本信息

批准号：
10650157
负责人：
HAYASE Toshiyuki
金额：
$ 1.92万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650157/
关键词：
Experimental Fluid Dynamics Computational Fluid Dynamics Flow Observer Flow Analysis Supercomputing Turbulent Flow Feedback Control Collapsible Tube 流れ場のオブザーバ

项目摘要

Numerical analysis and experiment are common tools in flow analysis. Each of these methods, however, has own shortcomings. The result of numerical analysis inherently depends on the mathematical model and the computational grid. A consistent way of validation of numerical solutions has not been established yet. Evaluation of result is relatively easy in experiment, but it usually gives only limited information of the whole flow field. It is, therefore, desirable to establish a new analysis methodology in which the numerical and experimental methods are integrated to compensate their shortcomings.In the present research the concept of "observer" in automatic control theory is applied to flow problems. In the observer the state of the physical system in asymptotically estimated from the mathematical model to which the measurement data are fed back in real time. The SIMPLER-based numerical simulation algorithm is used as the mathematical model and the boundary condition and/or external force terms are modified based on the difference between the experimental measurement and computational result. Validity of the present flow observer was examined through numerical analysis for the turbulent flow in a square duct. Possibility in application to turbulent flow control was also studied. The fundamental grid convergence property of numerical methods, and characteristics of the collapsible tube flow system, in which the flow and the tube deformation interact, were investigated as the basic understandings of the future research.These results give fundamental information in establishing the new methodology to deal with especially complex flow problems to which conventional methods in experiment or computation do not apply effectively.

数值分析和实验是流动分析的常用工具。然而，这些方法中的每一种都有自己的缺点。数值分析的结果固有地依赖于数学模型和计算网格。一个一致的方法验证的数值解尚未建立。实验结果的评价相对容易，但往往只能给出有限的流场信息。因此，有必要建立一种新的分析方法，其中的数值和实验方法相结合，以弥补其缺点。在本研究中，自动控制理论中的“观察器”的概念被应用到流动问题。在观测器中，物理系统的状态是从数学模型中渐近估计的，测量数据是真实的实时反馈到数学模型中的。采用基于SIMPLER的数值模拟算法作为数学模型，并根据实验测量值与计算结果之间的差异对边界条件和/或外力项进行修正。通过对方管内湍流流动的数值分析，验证了该观测器的有效性。并探讨了应用于湍流控制的可能性。研究了数值方法的基本网格收敛性和流动与变形相互作用的可折叠管流动系统的特性，为建立新的方法来处理传统的实验或计算方法无法有效处理的特别复杂的流动问题提供了基础信息。