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Direct Numerical Simulations of Mult...

Ouillon, Raphael .

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Direct Numerical Simulations of Multiphase, Stratified, Environmental Fluid Flows.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Direct Numerical Simulations of Multiphase, Stratified, Environmental Fluid Flows./
作者:	Ouillon, Raphael .
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	270 p.
附註:	Source: Dissertations Abstracts International, Volume: 81-09, Section: B.
Contained By:	Dissertations Abstracts International81-09B.
標題:	Fluid mechanics. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27545298
ISBN:	9781392529218

Direct Numerical Simulations of Multiphase, Stratified, Environmental Fluid Flows.
Ouillon, Raphael .

Direct Numerical Simulations of Multiphase, Stratified, Environmental Fluid Flows. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 270 p.

Source: Dissertations Abstracts International, Volume: 81-09, Section: B.

Thesis (Ph.D.)--University of California, Santa Barbara, 2019.

Many fundamental processes in oceanic transport and limnology occur in geophysical flows that are both local in space and transient in time, and that require equally space and time-resolved methods of analysis. The importance of providing physics-based, quantitative modeling of such flows has driven the development of numerical methods for geophysical fluid dynamics for over three decades. Here, we use direct numerical simulations to investigate a range of stratified, particle-laden flows that are accurately described by the three-dimensional Navier-Stokes equations for an incompressible flow in the Boussinesq limit. We firstly investigate the propagation, transport and mixing dynamics of density-driven gravity currents moving in stratified environments. We propose new models for the intrusion of a turbidity current into a linearly stratified ambient based on three-dimensional simulations. We then describe the interaction between a gravity-current and an internal wave and characterize a phenomenological change in the long-term effect of the interaction at a critical wave height. We then quantify the role of double-diffusive processes in the Dead Sea in Summer and their role in the seasonality of salt crystallization and deposition. We also describe large-scale double-diffusive instabilities that arise in high-Prandtl sedimentary double-diffusive systems such as linearly stratified particle-laden salt water. Finally, we quantify mixing induced by a swarm of small-scale self-propelled organisms migrating in a stratified ambient fluid. We compare the relative contribution to mixing by individual swimmers within the swarm to that of the large-scale motion produced by the collective motion of the swarm.

ISBN: 9781392529218Subjects--Topical Terms:

528155
Fluid mechanics.
Subjects--Index Terms:

Computational fluid dynamics

Direct Numerical Simulations of Multiphase, Stratified, Environmental Fluid Flows.
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245 1 0 $a Direct Numerical Simulations of Multiphase, Stratified, Environmental Fluid Flows.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 270 p.
500 $a Source: Dissertations Abstracts International, Volume: 81-09, Section: B.
500 $a Advisor: Meiburg, Eckart H.
502 $a Thesis (Ph.D.)--University of California, Santa Barbara, 2019.
520 $a Many fundamental processes in oceanic transport and limnology occur in geophysical flows that are both local in space and transient in time, and that require equally space and time-resolved methods of analysis. The importance of providing physics-based, quantitative modeling of such flows has driven the development of numerical methods for geophysical fluid dynamics for over three decades. Here, we use direct numerical simulations to investigate a range of stratified, particle-laden flows that are accurately described by the three-dimensional Navier-Stokes equations for an incompressible flow in the Boussinesq limit. We firstly investigate the propagation, transport and mixing dynamics of density-driven gravity currents moving in stratified environments. We propose new models for the intrusion of a turbidity current into a linearly stratified ambient based on three-dimensional simulations. We then describe the interaction between a gravity-current and an internal wave and characterize a phenomenological change in the long-term effect of the interaction at a critical wave height. We then quantify the role of double-diffusive processes in the Dead Sea in Summer and their role in the seasonality of salt crystallization and deposition. We also describe large-scale double-diffusive instabilities that arise in high-Prandtl sedimentary double-diffusive systems such as linearly stratified particle-laden salt water. Finally, we quantify mixing induced by a swarm of small-scale self-propelled organisms migrating in a stratified ambient fluid. We compare the relative contribution to mixing by individual swimmers within the swarm to that of the large-scale motion produced by the collective motion of the swarm.
590 $a School code: 0035.
650 4 $a Fluid mechanics. $3 528155
650 4 $a Computational physics. $3 3343998
650 4 $a Ocean engineering. $3 660731
653 $a Computational fluid dynamics
653 $a Geophysical fluid dynamics
653 $a Gravity flows
653 $a Multiphase flows
653 $a Particle-laden flows
653 $a Stratified flows
690 $a 0204
690 $a 0216
690 $a 0547
710 2 $a University of California, Santa Barbara. $b Mechanical Engineering. $3 1018391
773 0 $t Dissertations Abstracts International $g 81-09B.
790 $a 0035
791 $a Ph.D.
792 $a 2019
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27545298