자료유형  

 학위논문

Control Number  

0017160269

International Standard Book Number  

9798382839851

Dewey Decimal Classification Number  

620

Main Entry-Personal Name  

Han, Austin.

Publication, Distribution, etc. (Imprint  

[S.l.] : Cornell University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

154 p.

General Note  

Source: Dissertations Abstracts International, Volume: 85-12, Section: B.

General Note  

Advisor: Desjardins, Olivier.

Dissertation Note  

Thesis (Ph.D.)--Cornell University, 2024.

Summary, Etc.  

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.

Subject Added Entry-Topical Term  

Fluid mechanics.

Subject Added Entry-Topical Term  

Computational physics.

Subject Added Entry-Topical Term  

Mechanical engineering.

Index Term-Uncontrolled  

Atomization

Index Term-Uncontrolled  

Interface reconstruction

Index Term-Uncontrolled  

Multiphase flow

Index Term-Uncontrolled  

Numerical methods

Index Term-Uncontrolled  

Subgrid-scale modeling

Index Term-Uncontrolled  

Volume of fluid

Added Entry-Corporate Name  

Cornell University Mechanical Engineering

Host Item Entry  

Dissertations Abstracts International. 85-12B.

Electronic Location and Access  

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Control Number  

joongbu:654629