000014799 001__ 14799
000014799 005__ 20161115100202.0
000014799 04107 $$aeng
000014799 046__ $$k2016-08-21
000014799 100__ $$aBuckley, Marc
000014799 24500 $$aStructure of the airflow above surface gravity waves

000014799 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000014799 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000014799 506__ $$arestricted
000014799 520__ $$2eng$$aThe exchanges of momentum and scalars between the atmosphere and the oceans are influenced by the small-scale dynamics at the wavy air-sea interface. We present 2D PIV measurements of the kinematics in the airflow as low as 100 ,am above the water surface for different wind-wave conditions (wave ages Op /usr between 1.4 and 66.7). Laboratory data were obtained at University of Delaware’s (42-m long) wind-wave-current facility, using a multi-camera multi-laser setup that combines PIV with laser induced fluorescence. Field PIV measurements are also reported. We observe coherent turbulent structures in the airflow, including ejections of low velocity fluid away from the surface and downward sweeps of higher velocity fluid. Wave-phase-resolved quadrant analysis suggests that these events are modulated by the waves. Airflow separation occurs past young wave crests (Op/114* < 3.7), producing intense phase-locked turbulence. When Op /usr = 6.5, the mean wave-coherent airflow is qualitatively consistent with linear critical layer theory.

000014799 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000014799 653__ $$a

000014799 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000014799 720__ $$aBuckley, Marc
000014799 8560_ $$ffischerc@itam.cas.cz
000014799 8564_ $$s215626$$uhttps://invenio.itam.cas.cz/record/14799/files/TS.FM16-4.05.pdf$$yOriginal version of the author's contribution as presented on CD,  page 1626, code TS.FM16-4.05
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000014799 962__ $$r13812
000014799 980__ $$aPAPER