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DOI: 10.5445/KSP/1000003453
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Shallow turbulent wake flows: momentum and mass transfer due to large-scale coherent vortical structures

Carmer, Carl Friedrich von

Abstract:
Shallow turbulent wake flows are generated by large obstacles - like islands or headlands - introduced to shallow turbulent open-channel flows. Large-scale quasi two-dimensional vortices may shed off from an obstacle, and advect downstream in a vertical shear flow with predominantly small-scale turbulence induced by bottom friction. Experimental, analytical, and numerical techniques are employed in the present study to characterize the mean flow and turbulence properties of shallow wakes; mechanisms of generation and decay of large-scale vortical structures are clarified, as is their influence on momentum and mass transport in shallow wakes; the global and local stability of shallow wakes is analyzed and evidenced from experimental data. Part I of this work covers non-intrusive optical measurement techniques especially adapted to investigate shallow shear flows. Flow velocities and mass concentrations are obtained (i) point-wise with high spatiotemporal resolution using a combinded LDV-LIF system, and (ii) field-wise using near-surface PIV and depth-averaged PCA systems with a coupling by phase-resolved averaging. Improved algorithm ... mehr


Zugehörige Institution(en) am KIT Institut für Hydromechanik (IFH)
Publikationstyp Hochschulschrift
Jahr 2005
Sprache Englisch
Identifikator ISBN: 3-937300-63-5
ISSN: 1439-4111
URN: urn:nbn:de:0072-34539
KITopen ID: 1000003453
Verlag Universitätsverlag Karlsruhe, Karlsruhe
Umfang XXVI, 398 S.
Serie Dissertationsreihe am Institut für Hydromechanik der Universität Karlsruhe (TH) ; 2005,2
Abschlussart Dissertation
Fakultät Fakultät für Bauingenieur-, Geo- und Umweltwissenschaften (BGU)
Institut Institut für Hydromechanik (IFH)
Prüfungsdaten 13.04.2005
Referent/Betreuer Prof. H. Jirka
Schlagworte wake flow, shallow water, turbulence, coherent structure, vortex street, mass transport, flow measurement, LDV, LIF, PIV, PCA, light absorbtion
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