Presented By: Aerospace Engineering
Defense Dissertation: Extreme Events in Turbulent Combustion
Malik Hassanaly
Malik Hassanaly
Committee:
Prof. Venkat Raman (Chair)
Prof. Krishna Garikipati (Cognate)
Prof. Karthik Duraisamy (Member)
Prof. Mirko Gamba (Member)
Presentation Info:
Date: May 2nd, 2019
Time: 1:00 PM
Location: General Motors Room, Lurie Engineering Center
The design of reliable combustors is a crucial aspect of propulsion and energy production applications: a faulty combustor could cost human lives and millions (if not billions) of dollars. In practice, it is unreasonable to expect all devices to be extensively tested for all operating conditions that they will experience. The set of possible conditions is large, and the state of the device itself can evolve during its lifetime. Yet, deviations from normal behavior, or extreme events, should be appropriately accounted for during the design and the operation of the combustor.
In this work, a theoretical approach for the prediction of extreme events is presented. A classification of failures is proposed, and predictive questions that pertain to the failures are identified. This framework guides the work done in this thesis and is tailored to pave the way of future developments that are not addressed here.
The presentation will focus on the Lyapunov analysis, as it will be argued that it is a valuable tool that can be used to characterize the dynamics of the systems of interest. The Lyapunov analysis will be extensively presented, its numerical convergence examined in the context of fluid dynamics, and will then be applied to two systems of interest for turbulent combustion: a homogeneous isotropic turbulent flow and a partially premixed turbulent flame.
Committee:
Prof. Venkat Raman (Chair)
Prof. Krishna Garikipati (Cognate)
Prof. Karthik Duraisamy (Member)
Prof. Mirko Gamba (Member)
Presentation Info:
Date: May 2nd, 2019
Time: 1:00 PM
Location: General Motors Room, Lurie Engineering Center
The design of reliable combustors is a crucial aspect of propulsion and energy production applications: a faulty combustor could cost human lives and millions (if not billions) of dollars. In practice, it is unreasonable to expect all devices to be extensively tested for all operating conditions that they will experience. The set of possible conditions is large, and the state of the device itself can evolve during its lifetime. Yet, deviations from normal behavior, or extreme events, should be appropriately accounted for during the design and the operation of the combustor.
In this work, a theoretical approach for the prediction of extreme events is presented. A classification of failures is proposed, and predictive questions that pertain to the failures are identified. This framework guides the work done in this thesis and is tailored to pave the way of future developments that are not addressed here.
The presentation will focus on the Lyapunov analysis, as it will be argued that it is a valuable tool that can be used to characterize the dynamics of the systems of interest. The Lyapunov analysis will be extensively presented, its numerical convergence examined in the context of fluid dynamics, and will then be applied to two systems of interest for turbulent combustion: a homogeneous isotropic turbulent flow and a partially premixed turbulent flame.
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