NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
53rd NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan
Session ID : 1D1
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OS17
Spatio-temporal measurement of flow field using ultrasonic Doppler method and its application to flow structure analysis
*Yasushi TakedaGreg King
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Abstract
Ultrasonic Doppler method, a novel measurement method of fluid flow, enables us to obtain flow field velocity information in the form of spatio-temporal dimension. As a consequence of such a development, a new analytical tool has been needed for a flow study. We use a two-dimensional Fourier Transform and a Singular System Analysis (SSA),. We show that the Ultrasonic Doppler Method enables us to obtain spatio-temporal information of velocity field of fluid flow, which might open a new scope of horizon in the experimental fluid mechanics. For analyzing such form of experimental data to make physics, orthogonal decomposition techniques are useful; especially to investigate flow structures which strongly involves spatio- temporal nature such as flow transition to turbulence.
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© 2004 Committee for Mechanics and Structure,Science Council
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