Print Email Facebook Twitter Experiments on Unsteady Seperating Flow in an Open Channel Title Experiments on Unsteady Seperating Flow in an Open Channel Author Koppel, T. Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Date 1981-03-01 Abstract Experiments on unsteady separating flow past a sudden expansion in an open channel are described. To simulate tidal flow the flow rate in the approach channel varied as a half-sine with time. Different visualization techniques to obtain an insight into the behaviour of the separating vortex in time and space were used. Laser-Doppler velocimetry (LDV) was employed to measure velocities and turbulence characteristics. The data obtained from the LDV-measurements was processed on a computer using the ensemble-averaging technique. Results at different flow rates of the visualization experiments, measured mean-velocity fields, and characteristics of the turbulence - such as intensities, Reynolds stresses and turbulence energy - are shown. Some examples of velocity power-spectra and statistical distributions are presented also. The experiments also provide information about the generation of turbulence related to the separation mechanism and that owing to boundary-layer instability. Subject unsteadyseperatingflowsudden expansionopen channelexperimentsturbulencevelocity power-spectrastatistical distributioninstability To reference this document use: http://resolver.tudelft.nl/uuid:6bca6b54-b2f6-41fc-a42e-adbd173489ee Publisher TU Delft, Department of Hydraulic Engineering Source Report No. 3-81 Part of collection Institutional Repository Document type report Rights (c) TU Delft, Department of Hydraulic Engineering Files PDF Koppel1981.pdf 24.33 MB Close viewer /islandora/object/uuid:6bca6b54-b2f6-41fc-a42e-adbd173489ee/datastream/OBJ/view