NDLI: Simplified Model Of The Air Flow Above Waves

Content Provider	Springer Nature Link
Author	Kudryavtsev, V. N. Makin, V. K. Meirink, J. F.
Copyright Year	2001
Abstract	A simplified model of the air flow over surface water waves propagating at arbitrary phase velocity as compared to the wind velocity is presented. The approach is based on the subdivision of the air flow into an outer (OR) and an inner (IR) region. In the OR the wave-induced motion experiences inviscid undulation, while in the IR it is strongly affected by the turbulent shear stress. The subdivision of the air flow into two regions considerably simplifies the solution of the problem. The critical height (the height where the wind speed and the wave phase velocity are equal) is for mostcases located inside the IR. Its singular behaviour is strongly suppressed byturbulence. The description of the wind velocities in the OR is based on anapproximate solution of the Rayleigh equation. The description of the IR isbased on the solution of the vorticity equation accounting for turbulentdiffusion. The local eddy-viscosity mixing length closure scheme is used toparameterize the turbulent shear stress. Exponential damping of the shearstress variation with height towards the OR is introduced. This dampingdescribes phenomenologically the basic feature of the wave boundary layer: arapid distortion of turbulence in the OR. Wave-induced velocity and shearstress profiles, and the wave growth rate, resulting from the model showreasonable agreement with those obtained by a two-dimensional numericalmodel based on a second-order closure scheme. Moreover, the velocityprofiles are in good agreement with laboratory measurements.
Starting Page	63
Ending Page	90
Page Count	28
File Format	PDF
ISSN	00068314
Journal	Boundary-Layer Meteorology
Volume Number	100
Issue Number	1
e-ISSN	15731472
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Meteorology/Climatology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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