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Numerical simulation of free-surface turbulence.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Numerical simulation of free-surface turbulence./
作者:	Guo, Xin.
面頁冊數:	1 online resource (286 pages)
附註:	Source: Dissertations Abstracts International, Volume: 74-10, Section: B.
Contained By:	Dissertations Abstracts International74-10B.
標題:	Geophysical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3536517click for full text (PQDT)
ISBN:	9781267948496

Numerical simulation of free-surface turbulence.
Guo, Xin.

Numerical simulation of free-surface turbulence. - 1 online resource (286 pages)

Source: Dissertations Abstracts International, Volume: 74-10, Section: B.

Thesis (Ph.D.)--The Johns Hopkins University, 2012.

Includes bibliographical references

We investigate numerical methods for precise setup and maintenance of wave and turbulence so that a mechanistic study of wave-turbulence interaction can be performed. For the generation and suppression of specific surface waves, we develop a pressure-forcing method. For the turbulence generation in an inhomogeneous physical domain with a wavy boundary fitted grid, we extend the linear-forcing method. For the generation and maintenance of waves and turbulence during the complex wave-turbulence interaction process, we first develop an algorithm to instantaneously identify specific progressive and standing waves, based on which we then implement methods for generation, maintenance, or suppression for different wave modes. To precisely control the wave amplitude in a complex turbulence field, we further develop an energy-controlling method. Direct numerical simulation (DNS) is performed to study the interaction between a deformable free surface and the underlying homogeneous turbulent flow generated with the linear-forcing method. Two types of characteristic surface motions are identified: propagating waves and turbulence-generated surface roughness. The effects of surface blockage and vanishing shear stress on the anisotropy of the flow field are illustrated. Splat and anti-splat events, which play an essential role in energy inter-component exchange and vertical transport, are studied. DNS is performed to study the effect of progressive wave on turbulence underneath. To facilitate a mechanistic study, the wave and turbulence fields are set up precisely in the simulation with the pressure-forcing and linear-forcing methods, respectively. Cases with various moderate to large turbulence-to-wave time ratio and wave steepness are considered. Mean flow and turbulence are studied in the wave Eulerian and Lagrangian frames. In the Eulerian frame, statistics of the turbulence field illustrate the periodic distortion effect of wave on turbulence. In the Lagrangian frame, the mechanisms of the accumulative vortex titling and the net energy flux from the wave to the turbulence are studied. The accumulative effects of both the wave Lagrangian properties and the correlation between the Lagrangian fluctuations of the wave and turbulence are important. Models for various terms in the energy flux are discussed.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9781267948496Subjects--Topical Terms:

3558641
Geophysical.
Subjects--Index Terms:

Energy-controllingIndex Terms--Genre/Form:

542853
Electronic books.

Numerical simulation of free-surface turbulence.
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