Open AccessEXPERIMENTAL INVESTIGATION OF TURBULENCE NEAR CYLINDERS
Author(s) -
Torkild Carstens,
Søren Peter Kjeldsen,
Ola Gjorsvik
Publication year - 1974
Publication title -
proceedings of conference on coastal engineering/proceedings of ... conference on coastal engineering
Language(s) - English
Resource type - Journals
eISSN - 2156-1028
pISSN - 0589-087X
DOI - 10.9753/icce.v14.96
Subject(s) - turbulence , laminar flow , geology , boundary layer , mechanics , pipeline transport , physics , geotechnical engineering , engineering , environmental engineering
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.