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Nonlinear random wave-induced drag force on a vegetation field

✍ Scribed by Dag Myrhaug; Lars Erik Holmedal; Muk Chen Ong

Publisher: Elsevier Science
Year: 2009
Tongue: English
Weight: 238 KB
Volume: 56
Category: Article
ISSN: 0378-3839
DOI: 10.1016/j.coastaleng.2008.10.009

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✦ Synopsis

This paper provides a practical method by which the drag force on a vegetation field beneath nonlinear random waves can be estimated. This is achieved by using a simple drag formula together with an empirical drag coefficient given by Mendez et al. (Mendez, F.J., Losada, I.J., Losada, M.A., 1999. Hydrodynamics induced by wind waves in a vegetation field. J. Geophys. Res. 104 (C8), 18383-18396). Effects of nonlinear waves are included by using Stokes second order wave theory where the basic harmonic motion is assumed to be a stationary Gaussian narrow-band random process. An example of calculation is also presented.

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Drag force on a circular cylinder in uns

Drag force on a circular cylinder in unseparated laminar high Reynolds number nonlinear random oscillatory flow

✍ Dag Myrhaug; Hanne T. Wist; Lars Erik Holmedal 📂 Article 📅 2003 🏛 Elsevier Science 🌐 English ⚖ 123 KB

The stochastic properties of the drag force maxima on a circular cylinder subjected to nonlinear random waves are investigated. Unseparated laminar high Reynolds number flow is considered. A simplified approach based on second order Stokes waves is presented, including the sum-frequency effect only.