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Exact Coherent Structures and Non-Universality in the Direct Cascade in Two-Dimensional Turbulence
Exact Coherent Structures and Non-Universality in the Direct Cascade in Two-Dimensional Turbulence
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105554
- ISBN
- 9798265401762
- DDC
- 551.55
- 서명/저자
- Exact Coherent Structures and Non-Universality in the Direct Cascade in Two-Dimensional Turbulence
- 발행사항
- [Sl] : Georgia Institute of Technology, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 125 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Grigoriev, Roman.
- 학위논문주기
- Thesis (Ph.D.)--Georgia Institute of Technology, 2024.
- 초록/해제
- 요약Turbulence is the most important problem in physics and applied mathematics, with applications ranging from astrophysics, to engineering, to plumbing, and more. Turbulent flows are often characterized by the presence of various cascades, which transport various quantities across length scales. This dissertation focuses on turbulence confined in two-dimensions, which has two cascades: an inverse (energy) cascade that moves energy towards increasingly larger scales, and a direct (enstrophy) cascade that moves the enstrophy towards smaller scales.The energy cascade leads to the formation of large-scale vortices, which often take up the largest length allowed by the domain. The first part of this dissertation flows focuses on the dynamics of these large scale vortices, where we find that these vortices behave for substantial time intervals like specific solutions of the Euler equation. These solutions are in many ways analogous to recurrent solutions of the Navier-Stokes equation which are often referred to as exact coherent structures. On the other hand, these solutions have a number of properties which distinguish them from their Navier-Stokes counterparts, such as the fact that they exist in continuous, multiparameter families.At the same time, the classical theory of the direct cascade by Kraichnan, Leith, and Batchelor fails to predict the proper scaling of the enstrophy spectrum found in numerical simulations and experiments. This discrepancy is often attributed to the presence of largecoherent vortices. We will provide a physically interpretable mechanism for the direct cascade that recovers KLB predictions in the absence of large-scale vortices, but leads to deviations in their presence. Finally, we return directly to the large-scale dynamics we explain in the first section, and investigate exactly how properties of the large-scale flow affect the scaling of the enstrophy spectrum.
- 일반주제명
- Hurricanes
- 일반주제명
- Viscosity
- 일반주제명
- Ocean currents
- 일반주제명
- Vortices
- 일반주제명
- Orbits
- 일반주제명
- Navier-Stokes equations
- 일반주제명
- Fractals
- 일반주제명
- Energy
- 일반주제명
- Reynolds number
- 일반주제명
- Fluid mechanics
- 일반주제명
- Mathematics
- 일반주제명
- Meteorology
- 일반주제명
- Physical oceanography
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
■007cr#unu||||||||
■020 ▼a9798265401762
■035 ▼a(MiAaPQ)AAI32315841
■035 ▼a(MiAaPQ)GeorgiaTech75183
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551.55
■1001 ▼aZhigunov, Dmitriy.
■24510▼aExact Coherent Structures and Non-Universality in the Direct Cascade in Two-Dimensional Turbulence
■260 ▼a[Sl]▼bGeorgia Institute of Technology▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a125 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Grigoriev, Roman.
■5021 ▼aThesis (Ph.D.)--Georgia Institute of Technology, 2024.
■520 ▼aTurbulence is the most important problem in physics and applied mathematics, with applications ranging from astrophysics, to engineering, to plumbing, and more. Turbulent flows are often characterized by the presence of various cascades, which transport various quantities across length scales. This dissertation focuses on turbulence confined in two-dimensions, which has two cascades: an inverse (energy) cascade that moves energy towards increasingly larger scales, and a direct (enstrophy) cascade that moves the enstrophy towards smaller scales.The energy cascade leads to the formation of large-scale vortices, which often take up the largest length allowed by the domain. The first part of this dissertation flows focuses on the dynamics of these large scale vortices, where we find that these vortices behave for substantial time intervals like specific solutions of the Euler equation. These solutions are in many ways analogous to recurrent solutions of the Navier-Stokes equation which are often referred to as exact coherent structures. On the other hand, these solutions have a number of properties which distinguish them from their Navier-Stokes counterparts, such as the fact that they exist in continuous, multiparameter families.At the same time, the classical theory of the direct cascade by Kraichnan, Leith, and Batchelor fails to predict the proper scaling of the enstrophy spectrum found in numerical simulations and experiments. This discrepancy is often attributed to the presence of largecoherent vortices. We will provide a physically interpretable mechanism for the direct cascade that recovers KLB predictions in the absence of large-scale vortices, but leads to deviations in their presence. Finally, we return directly to the large-scale dynamics we explain in the first section, and investigate exactly how properties of the large-scale flow affect the scaling of the enstrophy spectrum.
■590 ▼aSchool code: 0078.
■650 4▼aHurricanes
■650 4▼aViscosity
■650 4▼aOcean currents
■650 4▼aVortices
■650 4▼aOrbits
■650 4▼aNavier-Stokes equations
■650 4▼aFractals
■650 4▼aEnergy
■650 4▼aReynolds number
■650 4▼aFluid mechanics
■650 4▼aMathematics
■650 4▼aMeteorology
■650 4▼aPhysical oceanography
■690 ▼a0791
■690 ▼a0204
■690 ▼a0405
■690 ▼a0557
■690 ▼a0415
■71020▼aGeorgia Institute of Technology.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0078
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360602▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


