変動流速場測定に対するフーリェ変換法に基づく画像速度場計測法

概要

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In this paper, we discuss the Fourier transform method (FTM) for particle image velocimetry. We point out that the conventional Fourier integrand may diverge for fluctuating velocity fields, and give incorrect results. We propose several improvements for FTM that suppress the divergence; these are based on spatial frequency filters, normalization or their combination. Two types of numerical simulations are carried out to examine the performance of the proposed methods. One deals with fluctuating velocity fields by adding white noise to a uniform flow; the other deals with a quasiunsteady wake past a circular cylinder given by a finite difference method. It is found that the R. M. S. error can be reduced to about 1.5 pixel by using a proposed FTM that is based on normalization and emphasis of low-frequency information.
一般社団法人日本機械学会の論文
1992-08-25