Now showing items 1971-1980 of 1985
Physics-Based Turbulence Anisotropy Closure Including Nonlocal and Nonequilibrium Effects in Turbulent Flows.
(2009)
A new physics-based anisotropy closure including nonlocal and nonequilibrium effects in turbulent flows has been obtained. The new closure is motivated by fundamental studies of the vorticity
alignment in turbulent flows, ...
Constrained Task Assignment and Scheduling on Networks of Arbitrary Topology.
(2012)
This dissertation develops a framework to address centralized and distributed constrained task assignment and task scheduling problems. This framework is used to prove properties of these problems that can be exploited, ...
An Experimental Study of the Stable and Unstable Operation of an LLP Gas Turbine Combustor.
(2008)
A study was performed to better understand the stable operation of an LPP combustor and formulate a mechanism behind the unstable operation. A unique combustor facility was developed at the University of Michigan that ...
An Experimental Investigation of Reacting and Nonreacting Coaxial Jet Mixing in a Laboratory Rocket Engine.
(2009)
Coaxial jets are commonly used as injectors in propulsion and combustion devices due to both the simplicity of their geometry and the rapid mixing they provide. In liquid rocket engines it is common to use coaxial jets in ...
Adaptive Control Based on Retrospective Cost Optimization.
(2009)
This dissertation studies adaptive control of multi-input, multi-output, linear, time-invariant, discrete-time systems that are possibly unstable and nonminimum phase. We consider both gradient-based adaptive control as ...
Optimal Information-based Classification.
(2011)
Classification is the allocation of an object to an existing category among several based on uncertain measurements. Since information is used to quantify uncertainty, it is natural to consider classification and information ...
Low-Reynolds Number Adaptive Flow Control Using Dielectric Barrier Discharge Actuator.
(2010)
Active flow control offers insight into fluid physics as well as possible improvements in flight performance for low-Reynolds number flyers – those at the chord-based Reynolds number of 105 or below – whose aerodynamic ...
The Effects of Outgassing Jets on the Rotation of a Comet Nucleus and on the Trajectory of an Orbiting Spacecraft.
(2009)
An outgassing jet model is presented in support of spacecraft navigation for future missions to comets. The outgassing jet is modelled as an emission cone while the comet nucleus is modelled as a uniform density triaxial ...
Kinetic Simulation of Rarefied and Weakly Ionized Hypersonic Flow Fields.
(2010)
When a vehicle enters the Earth's atmosphere at the very large velocities associated with Lunar and Mars return, a strong bow shock is formed in front of the vehicle. The shock heats the air to very high temperatures, ...
Reduced-Order Aerothermoelastic Analysis of Hypersonic Vehicle Structures.
(2012)
Design and simulation of hypersonic vehicles require consideration of a variety of disciplines due to the highly coupled nature of the flight regime. In order to capture all of the potential effects on vehicle dynamics, ...