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A Predictive Wall Model for Laminar-Turbulent Transition for Large-Eddy Simulation in External Aerodynamics
A Predictive Wall Model for Laminar-Turbulent Transition for Large-Eddy Simulation in External Aerodynamics
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105608
- ISBN
- 9798265426918
- DDC
- 600
- 서명/저자
- A Predictive Wall Model for Laminar-Turbulent Transition for Large-Eddy Simulation in External Aerodynamics
- 발행사항
- [Sl] : Stanford University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 132 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-05, Section: B.
- 주기사항
- Advisor: Moin, Parviz.
- 학위논문주기
- Thesis (Ph.D.)--Stanford University, 2025.
- 초록/해제
- 요약Modeling of laminar-turbulent transition remains one of the key challenges in the numerical simulation of boundary layers, especially at coarse grid resolutions. Transition to turbulence strongly affects practical concerns such as wall-shear stress distribution and surface heat transfer. For wall-modeled large-eddy simulations (WMLES) specifically, the thin laminar region can require 10-100 times more grid points than the turbulent region to properly capture the amplification of disturbances preceding breakdown to turbulence. We propose to use the nonlinear parabolized stability equations (NLPSE) in conjunction with WMLES to simulate transitional flows affordably and accurately.In the first part of the study, we develop the Falkner-Skan wall model (FSWM) for the simulation of laminar flow fields on coarse grids. The model is verified for laminar stagnation flow, a pressure gradient boundary layer flow, and flow over a NACA0012 airfoil. The FSWM is used in precursor simulations of transitional flows to generate accurate base flow states for nonlinear parabolized stability analysis. The NLPSE are used to predict the location of transition and subsequently supply a spatially and temporally varying inflow condition for the WMLES. This approach is demonstrated for zero pressure gradient flat plate H-type, K-type, and oblique transition scenarios. Accurate simulations are performed with 95\\% fewer mesh control volumes compared to high fidelity direct numerical simulations and wall-resolved large eddy simulations. An examination of the modeled velocity fields shows that realistic turbulent structures are formed in the PSE simulation and advected downstream into the subsequent WMLES.In the second part of this study, we extend the approach with the PSE-Sponge method, wherein a sponge-type forcing in the LES equations is used to drive the solution towards the more accurate PSE solution, directly within the simulation. The goal of this novel approach is to make it less cumbersome to model transitional flows over complex geometries. The method is verified on the same flat plate transition scenarios from the previous section. Sensitivity of the method to the newly introduced sponge parameter is discussed, as well as sensitivity to the quantity of modes interpolated from the PSE solution to the LES mesh. Finally, this method is applied to simulating transition on a natural laminar flow NLF(01)-0416 airfoil. It is found that the PSE-Sponge method is able to accurately simulate this flow where existing LES methodology fails.
- 일반주제명
- Friction
- 일반주제명
- Vortices
- 일반주제명
- Boundary conditions
- 일반주제명
- Shear stress
- 일반주제명
- Mathematics
- 기타저자
- Stanford University.
- 기본자료저록
- Dissertations Abstracts International. 87-05B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105608
■006m o d
■007cr#unu||||||||
■020 ▼a9798265426918
■035 ▼a(MiAaPQ)AAI32316365
■035 ▼a(MiAaPQ)Stanfordbd389bw5340
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a600
■1001 ▼aGonzalez, Carlos A.
■24512▼aA Predictive Wall Model for Laminar-Turbulent Transition for Large-Eddy Simulation in External Aerodynamics
■260 ▼a[Sl]▼bStanford University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a132 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-05, Section: B.
■500 ▼aAdvisor: Moin, Parviz.
■5021 ▼aThesis (Ph.D.)--Stanford University, 2025.
■520 ▼aModeling of laminar-turbulent transition remains one of the key challenges in the numerical simulation of boundary layers, especially at coarse grid resolutions. Transition to turbulence strongly affects practical concerns such as wall-shear stress distribution and surface heat transfer. For wall-modeled large-eddy simulations (WMLES) specifically, the thin laminar region can require 10-100 times more grid points than the turbulent region to properly capture the amplification of disturbances preceding breakdown to turbulence. We propose to use the nonlinear parabolized stability equations (NLPSE) in conjunction with WMLES to simulate transitional flows affordably and accurately.In the first part of the study, we develop the Falkner-Skan wall model (FSWM) for the simulation of laminar flow fields on coarse grids. The model is verified for laminar stagnation flow, a pressure gradient boundary layer flow, and flow over a NACA0012 airfoil. The FSWM is used in precursor simulations of transitional flows to generate accurate base flow states for nonlinear parabolized stability analysis. The NLPSE are used to predict the location of transition and subsequently supply a spatially and temporally varying inflow condition for the WMLES. This approach is demonstrated for zero pressure gradient flat plate H-type, K-type, and oblique transition scenarios. Accurate simulations are performed with 95\\% fewer mesh control volumes compared to high fidelity direct numerical simulations and wall-resolved large eddy simulations. An examination of the modeled velocity fields shows that realistic turbulent structures are formed in the PSE simulation and advected downstream into the subsequent WMLES.In the second part of this study, we extend the approach with the PSE-Sponge method, wherein a sponge-type forcing in the LES equations is used to drive the solution towards the more accurate PSE solution, directly within the simulation. The goal of this novel approach is to make it less cumbersome to model transitional flows over complex geometries. The method is verified on the same flat plate transition scenarios from the previous section. Sensitivity of the method to the newly introduced sponge parameter is discussed, as well as sensitivity to the quantity of modes interpolated from the PSE solution to the LES mesh. Finally, this method is applied to simulating transition on a natural laminar flow NLF(01)-0416 airfoil. It is found that the PSE-Sponge method is able to accurately simulate this flow where existing LES methodology fails.
■590 ▼aSchool code: 0212.
■650 4▼aFriction
■650 4▼aVortices
■650 4▼aBoundary conditions
■650 4▼aShear stress
■650 4▼aMathematics
■690 ▼a0405
■71020▼aStanford University.
■7730 ▼tDissertations Abstracts International▼g87-05B.
■790 ▼a0212
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360704▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
