ORCID

0000-0002-4931-4487

Keywords

computational fluid dynamics, multiphase flow, hypersonics, coatings, microfluidics

Abstract

The Volume-of-Fluid method, an Eulerian multiphase flow model that adds a volume fraction transport equation to the CFD governing equations, is widely used for any fluid-fluid interface tracking problem. There are important aspects of multiphase flow that impact aircraft flight, especially flight in extreme environments. These extreme environments can range from wet, icy conditions to sandstorms, and volcanic debris. The problems posed by these harsh environments are only exacerbated by aircraft that tend to travel at higher Mach-numbers. The specific aims of the proposed research include application of the Volume-of-fluid method to the following aspects of aircraft flight: shock-droplet interactions, and molten CMAS infiltrating a thermal barrier coating. Passive scalars are used in novel ways to elucidate droplet breakup physics. From this, a mechanism for how instabilities form on the air-droplet interface is discovered. It is also found that non-cavitating droplet breakup becomes much less dependent on Mach number at higher Mach numbers. A cavitation model designed for underwater explosions is adapted to the shock-droplet problem, and results show that cavitation phenomena is greatly dependent on Mach number, but the adapted model overpredicts cavitation effects. 2D and 3D CFD models are developed for the CMAS infiltration problem, and those are compared to analytical models from literature, and a new proposed analytical model called the feathery pipe network model. Results show that feathery pipe network model is both computationally inexpensive, and allows parameterization of useful properties.

Completion Date

2024

Semester

Fall

Committee Chair

Kinzel, Michael

Degree

Doctor of Philosophy (Ph.D.)

College

College of Engineering and Computer Science

Department

Mechanical and Aerospace Engineering

Degree Program

Aerospace Engineering

Format

PDF

Identifier

DP0028976

Language

English

Release Date

12-15-2024

Access Status

Dissertation

Campus Location

Orlando (Main) Campus

Accessibility Status

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