Numerical realization for analysis of real flows by integrating computation and measurement
Numerical realization for analysis of real flows by integrating computation and measurement
复制标题
计算与测量相结合的实际流量分析的数值实现
DOI：
10.1002/fld.829
复制
发表时间：
2005
影响因子：
1.8
通讯作者：
A. Shirai
中科院分区：
文献类型：
--
作者：
T. Hayase;Keisuke Nisugi;A. Shirai
在本文中，我们处理的数值实现，这是一个数值分析方法，再现真实的流动，通过集成数值模拟和测量。由于缺乏实验测量方法和计算中精确的边界条件或初始条件，真实的三维非定常流场信息的测量和计算比较困难。基于观测器理论，通过数值仿真、实验测量以及从两种方法的输出信号到仿真的反馈回路相结合来实现数值实现。本文重点讨论了与普通模拟相比，不适当的模型或网格分辨率不足如何影响数值实现的性能。对于方柱后存在卡门涡街的基本流场，采用三种网格分辨率的数值实现和普通模拟方法进行了二维分析。通过与实验结果的比较，证明了实验测量的反馈显著减小了由于网格分辨率不足而引起的误差，有效减小了由于模型假设二维性不合适而引起的误差。版权所有© 2004年约翰威利父子有限公司。
In this paper, we deal with a numerical realization, which is a numerical analysis methodology to reproduce real flows by integrating numerical simulation and measurement. It is difficult to measure or calculate field information of real three‐dimensional unsteady flows due to the lack of an experimental field measurement method, as well as of a way to specify the exact boundary or initial conditions in computation. Based on the observer theory, numerical realization is achieved by a combination of numerical simulation, experimental measurement, and a feedback loop to the simulation from the output signals of both methods. The present paper focuses on the problem of how an inappropriate model or insufficient grid resolution influences the performance of the numerical realization in comparison with ordinary simulation. For a fundamental flow with the Karman vortex street behind a square cylinder, two‐dimensional analysis is performed by means of numerical realization and ordinary simulation with three grid resolutions. Comparison of the results with those of the experiment proved that the feedback of the experimental measurement significantly reduces the error due to insufficient grid resolution and effectively reduces the error due to inappropriate model assuming two‐dimensionality. Copyright © 2004 John Wiley & Sons, Ltd.