000013836 001__ 13836
000013836 005__ 20161115094002.0
000013836 04107 $$aeng
000013836 046__ $$k2016-08-21
000013836 100__ $$aChamorro, Leonardo
000013836 24500 $$aOn the turbulence dynamics over geophysical-scale topography

000013836 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000013836 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000013836 506__ $$arestricted
000013836 520__ $$2eng$$aLaboratory experiments were performed to quantify the spatial and temporal features of the turbulence over geophysical-scale topography defined by large-scale wavy walls. High-resolution and high-frame-rate particle image velocimetry in a refractive-index-matching channel was used to infer the distinctive dynamics of the flows in terms of the topography and Reynolds number. We place the attention on the cases with 2D and 3D walls, where the 2D topography is defined by a sinusoidal wave in the streamwise direction with amplitude to wavelength ratio a/λx = 0.05, while the 3D wall has an additional wave superimposed on the 2D wall in the spanwise direction with a/λy = 0.1. The flow over these walls is characterized at Reynolds numbers Re ∼ 4×103 and 4×104 , based on the bulk velocity and the channel half height. Turbulence statistics, flow decomposition via POD and LES-like and compensated spectra are used to gain insights into the topography modulation on the flow.

000013836 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013836 653__ $$a

000013836 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000013836 720__ $$aChamorro, Leonardo
000013836 8560_ $$ffischerc@itam.cas.cz
000013836 8564_ $$s77809$$uhttps://invenio.itam.cas.cz/record/13836/files/PO.FM02-1.03.69.pdf$$yOriginal version of the author's contribution as presented on CD, XMLout( page 556, code PO.FM02-1.03.69).
000013836 962__ $$r13812
000013836 980__ $$aPAPER