Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session J44: Waves: Surface Waves III
4:35 PM–6:32 PM,
Sunday, November 19, 2023
Room: 208AB
Chair: Kianoosh Yousefi, University of Texas at Dallas
Abstract: J44.00002 : Wind-Ocean Surface Wave Interactions: Growth of Bound and Free Waves under Wind Forcing*
4:48 PM–5:01 PM
Presenter:
Clara Martín Blanco
(Princeton University)
Authors:
Clara Martín Blanco
(Princeton University)
Luc Deike
(Princeton University)
Jiarong Wu
(Princeton University)
We perform a comparative study by exploring various scenarios with different values of (ak) and (u∗/c), and carrier wavelength. We perform a space-time Fourier transform analysis, computing the wave spectrum E(k, ω). The analysis of the spectrum in space E(k) at different instances in time allows us to measure the respective growth rate β(k) for each wavenumber, while the analysis of the space-time Fourier spectrum E(k, ω) provides the angular frequency ω of each growing mode at a given k. We identify modes that are bound to the carrier wave as they grow at the same phase speed c = ω/k as the carrier wave, as well as the development of free modes traveling at a speed given by the dispersion relation of gravity-capillary waves. Results of the growth rate as a function of the wave age (u∗/c) are discussed and compared to previous results.
This comparative analysis allowed us to gain a comprehensive understanding of wind-ocean surface wave dynamics under varying conditions.
*NASA
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