Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"wake dynamics"”.
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A Comprehensive Three-Dimensional Analysis of the Wake Dynamics in Complex Turning Vanes
… has been conducted to characterize the flow dynamics and periodic structures formed in the wake of complex turning vanes. The vane packs were designed by the StreamVane swirl distortion generator technology, a design system that can efficiently reproduce swirl distortion for compressor rig …
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Frequency-domain modelling of floating wind turbines
… results: linearised models of the structural dynamics, hydrodynamics, aerodynamics and control system dynamics are brought together to find the overall response of the floating wind turbine to harmonic wind and wave loading. Initially, a nonlinear flexible multibody dynamics code is developed …
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Three dimensional topology and structural differences in the turbulent wake of cantilevered square and circular cylinders protruding thin boundary layers
… geometry and the boundary layer state on the wake structures and flow topology. Detailed velocimetry results are presented in the wake of circular and square cylinders protruding a thin laminar boundary layer at a nominal Reynolds number of 10500. The results are compared to those for similar …
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Effect of self-excited acoustic perturbations on flow characteristics around rectangular cylinders with varied geometrical aspects
… and incidence angles on the dynamic lift force, wake behaviors, and the susceptibility of such geometrical aspects to self-excited acoustic resonance in rectangular cylinders inside a high-speed wind tunnel. Experimental findings demonstrate a notable shift in both acoustic pressure and dynamic …
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Supermaneuverable perching
… at inducing and exploiting post-stall aerodynamics to quickly execute maneuvers with unprecedented precision, with nowhere near the sustained propulsive power found in modern state-of-the-art aircraft. This amazing ability to manipulate the air is commonly attributed to the intricate …
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Aerodynamic and Acoustic Modeling for eVTOL Rotor Noise Prediction
… noise contributions associated with unsteady wake dynamics and blade loading fluctuations. The combined use of mid-fidelity broadband predictions and high-fidelity tonal noise results enables improved reconstruction of the total sound pressure level spectrum and enhances agreement with …
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Flying snakes: Aerodynamics of body cross-sectional shape
… to determine the lift and drag coefficients, wake dynamics, and vortex shedding characteristics. This geometry produced a maximum lift coefficient of 1.9 and maximum lift to drag ratio of 2.7, and maintained increases in lift up to 35o. Overall, this geometry demonstrated robust aerodynamic …
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Internal wave generation and its impact at the island Shelf
… Madeira has been widely studied in terms of wake dynamics, mesoscale variability, and wind–island interactions, no systematic assessment of internal wave generation had been conducted in this area of the northeastern Atlantic. This thesis addresses this major gap by combining in-situ …
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The Influence of Trailing Edge Shape and Kinematics on Bio-inspired Pitching Panels
… manner at moderate Reynolds number. The wakes behaviors and wake dynamics of these panels are explored in a time-varying and time-averaged sense using results obtained from multiple planes of stereoscopic particle image velocimetry. The time-averaged and time-varying performance …
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Lagrangian dynamics of turbulence: Applications with 3D particle tracking velocimetry
Lagrangian dynamics of turbulence allow for a distinct characterization of the motion of particles. It is particularly useful in the understanding of dispersion, mixing, and transport phenomena. Due to the complexity and difficulty in quantifying Lagrangian properties, experimental studies on …
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An Experimental Investigation of Underbody and Near Wake Aerodynamics of Heavy Goods Vehicles
… flow influences the topology of the near wake, which is also responsible for substantial drag generation. However, the underlying mechanisms of these interactions, and thus the role of the underbody flow in the development of the wake flow features, are not well understood. This thesis …
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Advanced experimental modelling of hydrodynamic and aerodynamic wakes in floating offshore wind turbines using particle image velocimetry
… of floating substructure motions on turbine aerodynamics is crucial for achieving this, as the two-way coupling between the turbine and substructure impacts aerodynamic performance. Meanwhile, these substructure motions are inherently tied to their hydrodynamics, creating a complex interplay that …
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Rotor Wakes; Formations, Interactions, and Design
… the fundamental flow physics of rotor wakes and presents a rotor design methodology that enables the creation of mission-tailored wakes for improved aero-propulsive integration. These goals are addressed through a series of experimental campaigns involving both ducted and unducted …
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On the dynamics of rigid and flexible structures under complex flows
… efforts have been placed on characterizing the dynamics of structures under a wide range of flow. However, associated phenomena under turbulence are poorly understood. Quantitative description of the non-linear, multiscale interaction between structure dynamics and flow remains as an outstanding …
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Aeroacoustics Applications to Jets and Rotors
… simulations capture the unsteady flow dynamics and acoustic propagation, revealing how microjets alter the dominant frequency modes of coherent structures. Through Spectral Proper Orthogonal Decomposition (SPOD), the study identifies the impact of actuation on the energy distribution …
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Simulating Bluff-body Flameholders: On the Use of Proper Orthogonal Decomposition for Combustion Dynamics Validation
… and flow features in the flame, shear-layer, and wake of a bluff-body-stabilized flame. A general validation process is presented which involves a comparison of experimental and computational results, beginning with single-point mean statistics and then extending to the dynamic modes of the data …