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Numerical Modeling for Mesh-independent Simulations of Spray Atomization
Numerical Modeling for Mesh-independent Simulations of Spray Atomization
Numerical Modeling for Mesh-independent Simulations of Spray Atomization

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211150947
ISBN  
9798382839851
DDC  
620
저자명  
Han, Austin.
서명/저자  
Numerical Modeling for Mesh-independent Simulations of Spray Atomization
발행사항  
[Sl] : Cornell University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
154 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Desjardins, Olivier.
학위논문주기  
Thesis (Ph.D.)--Cornell University, 2024.
초록/해제  
요약Multiphase flows involving fluid-fluid interfaces with surface tension underlie many processes of scientific and industrial importance. A major challenge associated with the numerical modeling of these flows comes from their multi-scale behavior, where coexisting drops, bubbles, and films can vary in size by several orders of magnitude, requiring computationally prohibitive mesh resolutions. Furthermore, current methods for representing fluid interfaces rely on mesh-size-dependent numerical errors to perform topology changes, such as breakup and coalescence. This dissertation presents various numerical methods to drastically increase the accuracy of large-scale interfacial flow simulations performed with relatively coarse mesh resolutions and presents several models to account for subgrid-scale interfacial physics. Focus will be directed towards applications in spray atomization, where a large liquid structure fragments into many smaller droplets.First, the accurate calculation of surface tension forces is addressed through advances in methods for the estimation of interfacial curvature. To decouple the breakup of liquid films from the underlying mesh size, a novel two-plane method for the representation of subgrid-thickness films is then discussed. Next, a modeling framework is proposed to predict the formation of small droplets from the breakup of these liquid films, including their diameters and initial velocities. Finally, the proposed framework is validated with a canonical drop breakup problem, where the models produce drop sizes and velocities in quantitative agreement with experimental results. The proposed methods will facilitate the efficient subgrid-scale modeling of spray formation for engineering applications.
일반주제명  
Fluid mechanics
일반주제명  
Computational physics
일반주제명  
Mechanical engineering
키워드  
Atomization
키워드  
Interface reconstruction
키워드  
Multiphase flow
키워드  
Numerical methods
키워드  
Subgrid-scale modeling
키워드  
Volume of fluid
기타저자  
Cornell University Mechanical Engineering
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798382839851
■035    ▼a(MiAaPQ)AAI30992578
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a620
■1001  ▼aHan,  Austin.▼0(orcid)0000-0001-7186-4023
■24510▼aNumerical  Modeling  for  Mesh-independent  Simulations  of  Spray  Atomization
■260    ▼a[Sl]▼bCornell  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a154  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Desjardins,  Olivier.
■5021  ▼aThesis  (Ph.D.)--Cornell  University,  2024.
■520    ▼aMultiphase  flows  involving  fluid-fluid  interfaces  with  surface  tension  underlie  many  processes  of  scientific  and  industrial  importance.  A  major  challenge  associated  with  the  numerical  modeling  of  these  flows  comes  from  their  multi-scale  behavior,  where  coexisting  drops,  bubbles,  and  films  can  vary  in  size  by  several  orders  of  magnitude,  requiring  computationally  prohibitive  mesh  resolutions.  Furthermore,  current  methods  for  representing  fluid  interfaces  rely  on  mesh-size-dependent  numerical  errors  to  perform  topology  changes,  such  as  breakup  and  coalescence.  This  dissertation  presents  various  numerical  methods  to  drastically  increase  the  accuracy  of  large-scale  interfacial  flow  simulations  performed  with  relatively  coarse  mesh  resolutions  and  presents  several  models  to  account  for  subgrid-scale  interfacial  physics.  Focus  will  be  directed  towards  applications  in  spray  atomization,  where  a  large  liquid  structure  fragments  into  many  smaller  droplets.First,  the  accurate  calculation  of  surface  tension  forces  is  addressed  through  advances  in  methods  for  the  estimation  of  interfacial  curvature.  To  decouple  the  breakup  of  liquid  films  from  the  underlying  mesh  size,  a  novel  two-plane  method  for  the  representation  of  subgrid-thickness  films  is  then  discussed.  Next,  a  modeling  framework  is  proposed  to  predict  the  formation  of  small  droplets  from  the  breakup  of  these  liquid  films,  including  their  diameters  and  initial  velocities.  Finally,  the  proposed  framework  is  validated  with  a  canonical  drop  breakup  problem,  where  the  models  produce  drop  sizes  and  velocities  in  quantitative  agreement  with  experimental  results.  The  proposed  methods  will  facilitate  the  efficient  subgrid-scale  modeling  of  spray  formation  for  engineering  applications.
■590    ▼aSchool  code:  0058.
■650  4▼aFluid  mechanics
■650  4▼aComputational  physics
■650  4▼aMechanical  engineering
■653    ▼aAtomization
■653    ▼aInterface  reconstruction
■653    ▼aMultiphase  flow
■653    ▼aNumerical  methods
■653    ▼aSubgrid-scale  modeling
■653    ▼aVolume  of  fluid
■690    ▼a0204
■690    ▼a0216
■690    ▼a0548
■71020▼aCornell  University▼bMechanical  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0058
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17160269▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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