Convection Velocities in Turbulent Boundary Layers over Rough Surfaces

0511763 - ÚT 2020 RIV CH eng C - Conference Paper (international conference)
Jurčáková, Klára - Kellnerová, Radka
Convection Velocities in Turbulent Boundary Layers over Rough Surfaces.
Springer Proceedings in Physics. Cham: Springer, 2018 - (Manfredi, C.), s. 93-98. 226. ISBN 978-3-030-22195-9. ISSN 0930-8989.
[iTi Conference on Turbulence. Bertinoro (IT), 03.09.2018-07.09.2018]
R&D Projects: GA ČR(CZ) GA18-09539S; GA ČR(CZ) GA15-18964S
Institutional support: RVO:61388998
Keywords : wind tunnel * particle image velocimetry * spatial correlations * Taylor's hypothesis
OECD category: Fluids and plasma physics (including surface physics)

The time-resolved particle image velocimetry was used to asses the mean convection velocities of flow structures within the turbulent boundary layers above rough surfaces. The mean convection velocity was derived from the temporal-spatial correlation function. The mean convection velocities are larger than local mean velocities in the log layer and lower wake layer and vice versa in the upper wake layer. The cross-over height is higher for more rough surfaces. Larger structures are convected faster than smaller structures.
Permanent Link: http://hdl.handle.net/11104/0304529