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Numerical simulations of breaking in...

Fringer, Oliver Bartlett.

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Numerical simulations of breaking interfacial waves.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Numerical simulations of breaking interfacial waves./
作者:	Fringer, Oliver Bartlett.
面頁冊數:	194 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2102.
Contained By:	Dissertation Abstracts International64-05B.
標題:	Physical Oceanography. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3090588
ISBN:	0496383108

Numerical simulations of breaking interfacial waves.
Fringer, Oliver Bartlett.

Numerical simulations of breaking interfacial waves. - 194 p.

Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2102.

Thesis (Ph.D.)--Stanford University, 2003.

Two- and three-dimensional laboratory-scale numerical simulations are used to determine the instabilities that govern breaking interfacial waves, and to obtain an understanding of three-dimensional post-breaking dynamics and mixing. To quantify the breaking mechanism, two types of breaking are considered. The first type results from a horizontal heterogeneity, and the second results from large amplitude effects.

ISBN: 0496383108Subjects--Topical Terms:

1019163
Physical Oceanography.

Numerical simulations of breaking interfacial waves.
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245 1 0 $a Numerical simulations of breaking interfacial waves.
300 $a 194 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2102.
500 $a Adviser: Robert L. Street.
502 $a Thesis (Ph.D.)--Stanford University, 2003.
520 $a Two- and three-dimensional laboratory-scale numerical simulations are used to determine the instabilities that govern breaking interfacial waves, and to obtain an understanding of three-dimensional post-breaking dynamics and mixing. To quantify the breaking mechanism, two types of breaking are considered. The first type results from a horizontal heterogeneity, and the second results from large amplitude effects.
520 $a The breaking mechanism resulting from horizontal heterogeneity is studied under two different scenarios. In the first, waves propagate into a region of reduced buoyancy frequency, and in the second, waves break on sloped topography. In both cases, the waves encounter a region in which the wave speed is reduced. The waves break because the horizontal fluid velocity within the waves exceeds the wave speed, resulting in a convective instability.
520 $a Interfacial waves in a periodic domain are generated by imposing positive shear at the wave trough and negative shear at the wave crest. As a result of forcing this shearing distribution with a source term in the horizontal momentum equation, an interfacial wave grows in amplitude until the source term is removed. If the forcing is removed before the wave reaches a critical steepness, the result is a stable, progressive interfacial wave. The critical steepness is limited by a shear instability at the interface. Continued forcing of the interface beyond the critical steepness causes wave breaking when the horizontal fluid velocity within the wave exceeds the wave speed. Waves with thin interfaces break due to a predominant shear instability, while waves with thicker interfaces break as a result of a mixed shear-convective instability.
520 $a The initial instability governing the breaking of periodic interfacial waves is always two-dimensional. The subsequent three-dimensionality that occurs after the initial two-dimensional shear instability is dominated by longitudinal rolls which account for roughly half of the total dissipation of the wave energy. Dissipation and mixing are maximized when the interface thickness is roughly the same size as the amplitude of the wave. The maximum instantaneous mixing efficiency is found to be 0.36 +/- 0.02, which indicates convectively-driven mixing.
590 $a School code: 0212.
650 4 $a Physical Oceanography. $3 1019163
650 4 $a Physics, Fluid and Plasma. $3 1018402
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791 $a Ph.D.
792 $a 2003
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