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Higher-order Approximation Manifolds for More Efficient Nonlinear Projection-based Model Order Reduction
Higher-order Approximation Manifolds for More Efficient Nonlinear Projection-based Model O...
Higher-order Approximation Manifolds for More Efficient Nonlinear Projection-based Model Order Reduction

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자료유형  
 학위논문 서양
최종처리일시  
20250211151404
ISBN  
9798382235219
DDC  
519
저자명  
Joshua Lamar Barnett.
서명/저자  
Higher-order Approximation Manifolds for More Efficient Nonlinear Projection-based Model Order Reduction
발행사항  
[Sl] : Stanford University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
146 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-11, Section: B.
주기사항  
Advisor: Charbel Farhat.
학위논문주기  
Thesis (Ph.D.)--Stanford University, 2024.
초록/해제  
요약Solving large-scale parameterized dynamical systems, which may be obtained through, for example, the discretization of partial differential equations, is foundationally important to many fields, including engineering. Oftentimes, these high-dimensional models are expensive to evaluate due, in part, to their large size; this expense may be exacerbated by repeated evaluations in a large-dimensional parameter space. Projection-based model order reduction is a framework that allows us to solve these high-dimensional models at a much lower cost in terms of computational resources. This is accomplished by collecting prior solutions associated with different parameter values obtained by exercising the high-dimensional model and forming a lower-dimensional subspace. Using this subspace, we can compute a new solution associated with an unsampled parameter value at (ideally) a much lower cost. This computational efficiency has significant implications for applications in simulation-driven design, optimal control, and uncertainty quantification, among others, all of which would be impractical, if not impossible, for truly large-scale problems without resorting to some form of surrogate modeling. In practice, however, projection-based reduced order models sometimes struggle to achieve this level of performance in problems that exhibit the well-known Kolmogorov barrier as is often encountered in first-order hyperbolic partial differential equations, e.g., Navier-Stokes equations. This dissertation presents dimension reduction techniques, the problem of the Kolmogorov barrier, why it remains a challenge for model reduction today, and discusses methods to solve it. Among these methods are two novel approaches presented in this dissertation: a data-driven quadratic approximation manifold as well as an arbitrarily nonlinear approximation manifold using artificial neural networks. With no sacrifice in accuracy, both achieve an order of magnitude improvement in wall clock time compared to the current state-of-the-art in projection-based model order reduction for industrial-grade flow problems.
일반주제명  
Applied mathematics
일반주제명  
Mechanical engineering
키워드  
Partial differential equations
키워드  
Projection-based model
키워드  
Model reduction
키워드  
Artificial neural networks
기타저자  
Stanford University.
기본자료저록  
Dissertations Abstracts International. 85-11B.
전자적 위치 및 접속  
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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a519
■1001  ▼aJoshua  Lamar  Barnett.
■24510▼aHigher-order  Approximation  Manifolds  for  More  Efficient  Nonlinear  Projection-based  Model  Order  Reduction
■260    ▼a[Sl]▼bStanford  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a146  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-11,  Section:  B.
■500    ▼aAdvisor:  Charbel  Farhat.
■5021  ▼aThesis  (Ph.D.)--Stanford  University,  2024.
■520    ▼aSolving  large-scale  parameterized  dynamical  systems,  which  may  be  obtained  through,  for  example,  the  discretization  of  partial  differential  equations,  is  foundationally  important  to  many  fields,  including  engineering.  Oftentimes,  these  high-dimensional  models  are  expensive  to  evaluate  due,  in  part,  to  their  large  size;  this  expense  may  be  exacerbated  by  repeated  evaluations  in  a  large-dimensional  parameter  space.  Projection-based  model  order  reduction  is  a  framework  that  allows  us  to  solve  these  high-dimensional  models  at  a  much  lower  cost  in  terms  of  computational  resources.  This  is  accomplished  by  collecting  prior  solutions  associated  with  different  parameter  values  obtained  by  exercising  the  high-dimensional  model  and  forming  a  lower-dimensional  subspace.  Using  this  subspace,  we  can  compute  a  new  solution  associated  with  an  unsampled  parameter  value  at  (ideally)  a  much  lower  cost.  This  computational  efficiency  has  significant  implications  for  applications  in  simulation-driven  design,  optimal  control,  and  uncertainty  quantification,  among  others,  all  of  which  would  be  impractical,  if  not  impossible,  for  truly  large-scale  problems  without  resorting  to  some  form  of  surrogate  modeling.  In  practice,  however,  projection-based  reduced  order  models  sometimes  struggle  to  achieve  this  level  of  performance  in  problems  that  exhibit  the  well-known  Kolmogorov  barrier  as  is  often  encountered  in  first-order  hyperbolic  partial  differential  equations,  e.g.,  Navier-Stokes  equations.  This  dissertation  presents  dimension  reduction  techniques,  the  problem  of  the  Kolmogorov  barrier,  why  it  remains  a  challenge  for  model  reduction  today,  and  discusses  methods  to  solve  it.  Among  these  methods  are  two  novel  approaches  presented  in  this  dissertation:  a  data-driven  quadratic  approximation  manifold  as  well  as  an  arbitrarily  nonlinear  approximation  manifold  using  artificial  neural  networks.  With  no  sacrifice  in  accuracy,  both  achieve  an  order  of  magnitude  improvement  in  wall  clock  time  compared  to  the  current  state-of-the-art  in  projection-based  model  order  reduction  for  industrial-grade  flow  problems.
■590    ▼aSchool  code:  0212.
■650  4▼aApplied  mathematics
■650  4▼aMechanical  engineering
■653    ▼aPartial  differential  equations
■653    ▼aProjection-based  model
■653    ▼aModel  reduction  
■653    ▼aArtificial  neural  networks
■690    ▼a0548
■690    ▼a0364
■71020▼aStanford  University.
■7730  ▼tDissertations  Abstracts  International▼g85-11B.
■790    ▼a0212
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161498▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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