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International Society for Industrial Process Tomography

8th World Congress on Industrial Process Tomography

Tomographic Velocimetry Applied to Water Flow Past a Tall Structure Model

K. Ohmi 1, S. Tuladhar 2, J. Hao 2

1 Osaka Sangyo University, 3-1-1 Nakagaito, Daito, Osaka 574-8530, Japan

2 Graduate School of Osaka Sangyo University, 3-1-1 Nakagaito, Daito, Osaka 574-8530, Japan ohmi@ise.osaka-sandai.ac.jp

ABSTRACT

In the standard process of tomographic PIV, the 3D flow velocity is normally calculated from the particle displacement between 2 time steps, which is normally obtained by tomographic reconstruction of two time- differential instantaneous particle images recorded simultaneously by multiple cameras. In the present study, however, a single particle streak image, instead of two instantaneous images, is used to obtain the 3D velocity, in which process the effect of reconstruction noise or artifacts can be largely reduced. The inherent issues of particle streak based image velocimetry, namely the intersection of streaks and/or directional ambiguity are fixed properly in the in the present approach. The flow investigated in the study is a water cross flow past a half tall square cylinder.

Keywords Tomographic PIV, 3D velocity measurement, Particle streak, Particle path, Binary image pro- cessing, Morphology analysis, High-rise building

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