RAL Seminar Series - Small-scale wind-wave coupling in gale-force winds: models and experiments

Speaker:       Yuliya Troitskaya, Institute of Applied Physics RAS, Nizhny Novgorod, Russia, and Nizhny Novgorod State University, Nizhny Novgorod, Russia

Date:            Tuesday, February 18, 2014

Time:            3:30pm

Place:            FL 2 - 1022


This  talk  presents  our  recent  results  of comprehensive study of air-sea  interaction  under  severe  wind conditions. An experimental campaign  aimed  at  investigation of the mechanism of anomalously low aerodynamic   roughness  of  sea surface  under  hurricanes  recently observed  in  field  and laboratory experiments was carried out in the high-speed  wind wave  flume of the Institute of Applied Physics RAS. The experiments included simultaneous measurements of air flow velocity by contact and remote methods and 3D wind wave spectra. The tendency to saturation of the surface drag was observed for wind speeds exceeding 25 m/s, accompanied by the saturation of wind-wave slopes. For interpretation of the experiment, a quasi-linear theory of wind-wave coupling was developed. Verification of the model by numerical (DNS) and physical laboratory experiments is described. In the last part of the talk application of the model in field conditions is described. Parameterization of the surface drag coefficient based on calculations within the quasi-linear model for the model wind-wave spectra is suggested.

About the presenter
Yuliya Troitskaya

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Start date and time: 
Tuesday, February 18, 2014 - 3:30pm