Energy transfer from PSI‐generated M 1 subharmonic waves to high‐frequency internal waves

2022 ◽  
Author(s):  
Wei Yang ◽  
Hao Wei ◽  
Liang Zhao
Keyword(s):  
Energy Transfer ◽  
Internal Waves ◽  
High Frequency

Observed Energy Exchange between Low-Frequency Flows and Internal Waves in the Gulf of Mexico

2018 ◽  
Vol 48 (4) ◽  
pp. 995-1008 ◽  
Author(s):  
Zhao Jing ◽  
Ping Chang ◽  
S. F. DiMarco ◽  
Lixin Wu
Keyword(s):  
Energy Transfer ◽  
Gulf Of Mexico ◽  
Internal Waves ◽  
High Frequency ◽  
Energy Exchange ◽  
Low Frequency ◽  
Net Energy ◽  
Energy Transfer Rate ◽  
Capture Mechanism

AbstractA long-term mooring array deployed in the northern Gulf of Mexico is used to analyze energy exchange between internal waves and low-frequency flows. In the subthermocline (245–450 m), there is a noticeable net energy transfer from low-frequency flows, defined as having a period longer than six inertial periods, to internal waves. The magnitude of energy transfer rate depends on the Okubo–Weiss parameter of low-frequency flows. A permanent energy exchange occurs only when the Okubo–Weiss parameter is positive. The near-inertial internal waves (NIWs) make major contribution to the energy exchange owing to their energetic wave stress and relatively stronger interaction with low-frequency flows compared to the high-frequency internal waves. There is some evidence that the permanent energy exchange between low-frequency flows and NIWs is attributed to the partial realization of the wave capture mechanism. In the periods favoring the occurrence of the wave capture mechanism, the horizontal propagation direction of NIWs becomes anisotropic and exhibits evident tendency toward that predicted from the wave capture mechanism, leading to pronounced energy transfer from low-frequency flows to NIWs.

scholarly journals High-frequency internal waves near the Luzon Strait observed by underwater gliders

2013 ◽  
Vol 118 (2) ◽  
pp. 774-784 ◽  
Author(s):  
Daniel L. Rudnick ◽  
T. M. Shaun Johnston ◽  
Jeffrey T. Sherman
Keyword(s):  
Internal Waves ◽  
High Frequency ◽  
Luzon Strait ◽  
Underwater Gliders

scholarly journals The wireless energy transfer (WET) using ultra high frequency (UHF) for human body implant recharging

2018 ◽  
Vol 43 ◽  
pp. 01027
Author(s):  
Fahmy Rinanda Saputri ◽  
Sunarno ◽  
Memory Motivanisman Waruwu ◽  
Rony Wijaya
Keyword(s):  
Energy Transfer ◽  
Human Body ◽  
High Frequency ◽  
Wireless Energy Transfer ◽  
Ultra High Frequency ◽  
Size And Shape ◽  
Uhf Band

The wireless energy transfer (wet) is widely used in many fields. In particularly for medical, this technique can be implemented to an electronic human body implant recharging. The possible size and shape of the receiver antenna in the experiment before still become a problem. Using Yagi-Uda model antenna for the transmitter unit in ultra-high frequency (UHF) band, this paper refers to design a receiver antenna for implemented as a human implant recharging. The receiver antenna has successfully designed in minimal with its size and shape of the designed antenna is about 1.44 cm3.

Wavenumber transport: scattering of small-scale internal waves by large-scale wavepackets

1995 ◽  
Vol 289 ◽  
pp. 379-405 ◽  
Author(s):  
David L. Bruhwiler ◽  
Tasso J. Kaper
Keyword(s):  
Internal Waves ◽  
High Frequency ◽  
Large Scale ◽  
Wave Interaction ◽  
Initial Distribution ◽  
Small Scale ◽  
Theoretic Model ◽  
Frequency Interval ◽  
Crossing Theory ◽  
Invariance Theory

In this work, we treat the problem of small-scale, small-amplitude, internal waves interacting nonlinearly with a vigorous, large-scale, undulating shear. The amplitude of the background shear can be arbitrarily large, with a general profile, but our analysis requires that the amplitude vary on a length scale longer than the wavelength of the undulations. In order to illustrate the method, we consider the ray-theoretic model due to Broutman & Young (1986) of high-frequency oceanic internal waves that trap and detrap in a near-inertial wavepacket as a prototype problem. The near-inertial wavepacket tends to transport the high-frequency test waves from larger to smaller wavenumber, and hence to higher frequency. We identify the essential physical mechanisms of this wavenumber transport, and we quantify it. We also show that, for an initial ensemble of test waves with frequencies between the inertial and buoyancy frequencies and in which the number of test waves per frequency interval is proportional to the inverse square of the frequency, a single nonlinear wave–wave interaction fundamentally alters this initial distribution. After the interaction, the slope on a log-log plot is nearly flat, whereas initially it was -2. Our analysis captures this change in slope. The main techniques employed are classical adiabatic invariance theory and adiabatic separatrix crossing theory.

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