Pressure fluctuations on the scour surface before prismatic pier

Voskoboinick, V. and Voskoboinick, A. and Areshkovych, O. and Voskoboinyk, O. (2016) Pressure fluctuations on the scour surface before prismatic pier. In: ICSE 2016 (8th International Conference on Scour and Erosion), 12-15 September 2016, Oxford, UK.

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Abstract

The results of experimental research of the wall-pressure fluctuation field acting on the scour surface upstream of the prismatic pier model are presented. Experiments were carried out in the hydraulic flume with an open water surface and sandy bed. The spatial and temporal characteristics of the field of pseudosound the wall-pressure fluctuation were determined on the equilibrium scour surface upstream of the prismatic pier model, as well as the sources of their generation. Two quasistable large-scale horseshoe vortex formations occurred inside the scour hole in front of the bluff body. The first of them were generated in the separation of the boundary layer with the front edge of the scour hole and it formed the upper slope of the scour. A second smaller horseshoe formation were formed by the interaction of the shear layer beyond the scour hole and the down flow along the front surface of the prismatic model and it formed the lower slope of the scour. The highest intensity and level of spectral components of the wall-pressure fluctuation occurred inside the scour hole upstream of the prismatic pier model.

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