PIV study of turbulent flow around a circular bridge pier using fractal scaling

Publisher:
Engineers australia
Publication Type:
Conference Proceeding
Citation:
Hydrology and water resources symposium 2012, 2012, pp. 1604 - 1609
Issue Date:
2012-01
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The flow structure around a bridge pier is complicated, particularly in the flow immediately downstream of a bridge pier. In the study reported herein, the fractal dimensions of velocity fluctuations (u, v) were investigated. Two dimensional velocity fluctuations at horizontal surface were measured using Particle Image Velocimetry (PIV). At each horizontal surface, 700 pairs of images were captured at a frequency of 15 Hz. The time interval between two frames in a pair of captured frames was 10 m seconds. The fractal dimensions were computed using a Fractal Interpolation Function (FIF) algorithm. From the results, it was found that the fractal dimensions fluctuated significantly in the streamwise and transverse flow directions in the vicinity of the pier. A symmetrical pattern of the fractal dimension was found at the rear of the bridge pier. Furthermore, it was found that the fractal dimensions of velocity fluctuations increased rapidly at vicinity of pier at downstream whereas it decreased far from the pier. Therefore, it can be concluded that the fractal dimension using FIF well describes the flow structure around bridge pier.
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