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Dimensional Reduction of Adaptively Refined Nonlinear Computational Models
Dimensional Reduction of Adaptively Refined Nonlinear Computational Models
Dimensional Reduction of Adaptively Refined Nonlinear Computational Models

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152746
ISBN  
9798342113557
DDC  
530
저자명  
Little, Clayton.
서명/저자  
Dimensional Reduction of Adaptively Refined Nonlinear Computational Models
발행사항  
[Sl] : Stanford University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
134 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-04, Section: A.
주기사항  
Advisor: Farhat, Charbel.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2024.
초록/해제  
요약Adaptive mesh refinement (AMR) is fairly practiced in the context of high-dimensional, mesh-based computational models. However, it is preliminary in the context of low-dimensional, generalized-coordinate-based computational models such as projection-based reduced-order models (PROMs). This dissertation presents a complete framework for projection-based model order reduction (PMOR) of nonlinear problems in the presence of AMR that builds on elements from existing methods and augments them with critical new contributions. In particular, it proposes two algorithms for computing an inner product between spatially-adapted solution snapshots for the purpose of clustering and PMOR. The first algorithm is a semi-analytical pseudo-meshless inner product which builds on existing methods, and the second algorithm is a novel approximate method which maximizes computational efficiency. The proposed framework exploits hyperreduction---specifically, the energy-conserving sampling and weighting hyperreduction (ECSW) method---to deliver for nonlinear and/or parametric problems the desired computational gains. Most importantly, it exploits piecewise-affine approximation of the solution manifold to make the most of the notion of a supermesh, while achieving computational tractability. The performance of the proposed framework for PMOR in the presence of AMR is assessed for computational fluid dynamics (CFD) applications utilizing AMR. Its significance is demonstrated by the reported accuracies and gains in computational efficiency.
일반주제명  
Vortices
일반주제명  
Fluid-structure interaction
일반주제명  
Mathematical models
일반주제명  
Fluid dynamics
일반주제명  
Symmetry
일반주제명  
Decomposition
일반주제명  
Mechanics
일반주제명  
Dynamical systems
일반주제명  
Design optimization
일반주제명  
Physics
일반주제명  
Partial differential equations
일반주제명  
Viscosity
일반주제명  
Turbulence models
일반주제명  
Digital twins
일반주제명  
Neural networks
일반주제명  
Reynolds number
일반주제명  
Computer engineering
일반주제명  
Design
일반주제명  
Fluid mechanics
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 86-04A.
전자적 위치 및 접속  
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MARC

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■035    ▼a(MiAaPQ)Stanfordnd246sx8551
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aLittle,  Clayton.
■24510▼aDimensional  Reduction  of  Adaptively  Refined  Nonlinear  Computational  Models
■260    ▼a[Sl]▼bStanford  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a134  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-04,  Section:  A.
■500    ▼aAdvisor:  Farhat,  Charbel.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2024.
■520    ▼aAdaptive  mesh  refinement  (AMR)  is  fairly  practiced  in  the  context  of  high-dimensional,  mesh-based  computational  models.  However,  it  is  preliminary  in  the  context  of  low-dimensional,  generalized-coordinate-based  computational  models  such  as  projection-based  reduced-order  models  (PROMs).  This  dissertation  presents  a  complete  framework  for  projection-based  model  order  reduction  (PMOR)  of  nonlinear  problems  in  the  presence  of  AMR  that  builds  on  elements  from  existing  methods  and  augments  them  with  critical  new  contributions.  In  particular,  it  proposes  two  algorithms  for  computing  an  inner  product  between  spatially-adapted  solution  snapshots  for  the  purpose  of  clustering  and  PMOR.  The  first  algorithm  is  a  semi-analytical  pseudo-meshless  inner  product  which  builds  on  existing  methods,  and  the  second  algorithm  is  a  novel  approximate  method  which  maximizes  computational  efficiency.  The  proposed  framework  exploits  hyperreduction---specifically,  the  energy-conserving  sampling  and  weighting  hyperreduction  (ECSW)  method---to  deliver  for  nonlinear  and/or  parametric  problems  the  desired  computational  gains.  Most  importantly,  it  exploits  piecewise-affine  approximation  of  the  solution  manifold  to  make  the  most  of  the  notion  of  a  supermesh,  while  achieving  computational  tractability.  The  performance  of  the  proposed  framework  for  PMOR  in  the  presence  of  AMR  is  assessed  for  computational  fluid  dynamics  (CFD)  applications  utilizing  AMR.  Its  significance  is  demonstrated  by  the  reported  accuracies  and  gains  in  computational  efficiency.
■590    ▼aSchool  code:  0212.
■650  4▼aVortices
■650  4▼aFluid-structure  interaction
■650  4▼aMathematical  models
■650  4▼aFluid  dynamics
■650  4▼aSymmetry
■650  4▼aDecomposition
■650  4▼aMechanics
■650  4▼aDynamical  systems
■650  4▼aDesign  optimization
■650  4▼aPhysics
■650  4▼aPartial  differential  equations
■650  4▼aViscosity
■650  4▼aTurbulence  models
■650  4▼aDigital  twins
■650  4▼aNeural  networks
■650  4▼aReynolds  number
■650  4▼aComputer  engineering
■650  4▼aDesign
■650  4▼aFluid  mechanics
■690    ▼a0346
■690    ▼a0605
■690    ▼a0800
■690    ▼a0464
■690    ▼a0389
■690    ▼a0204
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g86-04A.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163732▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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