EXPERIMENTAL INVESTIGATION OF TURBULENCE NEAR CYLINDERS

Torkild Carstens, Soren Peter Kjeldsen, Ola Gjorsvik

Abstract


Model tests with locally generated turbulence near horizontal and vertical cylinders are reported. Turbulence is measured with newly developed ultra-sonic probes, and spectral density functions and auto-correlation functions are given. Tests are carried out in uniform currents, in sinusoidal waves, and in combinations of current and waves. Results are given for a viscous laminar boundary layer corresponding to a very fine sediment, and for a turbulent boundary layer corresponding to a hydraulically rough bottom. In Norway recent scour research, initiated by the North Sea oil operations, has been guided in three directions: 1) Scour around big gravity structures 2) Distribution of pore pressures in the ground under wave loads. 3) Local scour near unburied pipelines.

Keywords


turbulence; turbulence near cylinders; experimental investigation

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