| Title: | IRROTATIONAL, ROTATIONAL AND TURBULENT FLOWS IN BREAKING WAVES |
| DOI No: | 10.1142/9789812709554_0006 |
| Source: | COASTAL ENGINEERING 2006 (pp 62-72)
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| Author(s): | Yasunori Watanabe
School of Engineering, Hokkaido University, North 13 West 8, Sapporo, 060 8628, Japan
Ayumi Saruwatari
School of Engineering, Hokkaido University, North 13 West 8, Sapporo, 060 8628, Japan
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| Abstract: | This paper presents a reasonable method for decomposing instantaneous velocity field in breaking waves, into irrotational, rotational and turbulent velocity components. In this method, Nowgu's approach (1993) for Boussinesq type equation, applying slip bottom velocity computed in a large eddy simulation, is used for estimating the irrotational velocity in breaking waves, and the rotational velocity is obtained on the basis of Helmholtz decomposition. A transition from potential wave energy in incident waves to rotational flows within breaking-induced large-scale vortices and small-scale turbulence through a wave breaking process can be expressed using the proposing decomposition method. |
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