國立虎尾科技大學 |

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

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Direct Numerical Simulations of Multiphase, Stratified, Environmental Fluid Flows./
作者:	Ouillon, Raphael .
面頁冊數:	1 online resource (270 pages)
附註:	Source: Dissertations Abstracts International, Volume: 81-09, Section: B.
Contained By:	Dissertations Abstracts International81-09B.
標題:	Ocean engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9781392529218

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

Direct Numerical Simulations of Multiphase, Stratified, Environmental Fluid Flows. - 1 online resource (270 pages)

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

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

Includes bibliographical references

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.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9781392529218Subjects--Topical Terms:

857658
Ocean engineering.
Subjects--Index Terms:

Computational fluid dynamicsIndex Terms--Genre/Form:

554714
Electronic books.

Direct Numerical Simulations of Multiphase, Stratified, Environmental Fluid Flows.
LDR:03183ntm a22004097 4500 001 1151959
005 20241125080152.5
006 m o d
007 cr mn ---uuuuu
008 250605s2019 xx obm 000 0 eng d
020 $a 9781392529218
035 $a (MiAaPQ)AAI27545298
035 $a AAI27545298
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Ouillon, Raphael . $3 1478809
245 1 0 $a Direct Numerical Simulations of Multiphase, Stratified, Environmental Fluid Flows.
264 0 $c 2019
300 $a 1 online resource (270 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
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.
504 $a Includes bibliographical references
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.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Ocean engineering. $3 857658
650 4 $a Computational physics. $3 1181955
650 4 $a Fluid mechanics. $3 555551
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
655 7 $a Electronic books. $2 local $3 554714
690 $a 0204
690 $a 0216
690 $a 0547
710 2 $a University of California, Santa Barbara. $b Mechanical Engineering. $3 1148679
710 2 $a ProQuest Information and Learning Co. $3 1178819
773 0 $t Dissertations Abstracts International $g 81-09B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27545298 $z click for full text (PQDT)