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 20 of 40 for “"flowfields"”.
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Wake closure conditions in plug nozzle flowfields
The aerospike, of plug, nozzle is being proposed for future space launch vehicle applications. The design of the nozzle involves complex wake structures that directly affect engine performance. In particular, the closed or open wake condition of the flow determines the dependence of the base …
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Computational Fluid Dynamics Methodologies for Simulation of Chemical Oxygen-Iodine Laser Flowfields
Simulation of chemical lasers such as the chemical oxygen-iodine laser (COIL) is of timely interest due to the recent acceleration of the airborne laser military research program and ongoing commercial development programs. As a part of these efforts, a 3-D COIL simulation model was developed based …
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Water management strategies for polymer electrolyte fuel cells (PEFCs) employing microchannel flowfields
… strategies for PEFCs employing microchannel flowfields, namely manipulation of operating conditions and modification to the design of components within the MEA. Four different gas diffusion layer (GDL) cases were tested in a single cell environment at four different cathode flowrates and …
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A computational study of the effects of viscosity on lobed mixer flowfields
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Design and analysis of internal flowfields using a two stream function formulation
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
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Computation of unsteady transonic flowfields using shock capturing and the linear perturbation Euler equations
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Numerical Solutions for Two- and Three-Dimensional Non-Reacting Flowfields in an Internal Combustion Engine
… is found to be justified for the non- reacting flowfields considered, since the results obtained from a two-dimensional calculation in the valve plane are apparently not strongly dependent on the flowfield perpendicular to the valve plane. It is found that significant flowfields do exist in all …
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An experimental investigation of unsteady separation shock wave motion in a plume-induced, separated flowfield
… plume-induced, boundary layer separated (PIBLS) flowfields has been conducted. The PIBLS flowfields were created in a blowdown-type wind tunnel designed specifically to produce PIBLS in a planar, two-stream, supersonic flow. In this unique wind tunnel, separation of the freestream boundary layer …
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High Angle of Attack Forebody Flow Physics and Design Emphasizing Directional Stability
… for understanding the fundamental physics of flowfields over forebody type shapes at low speed, high angle of attack conditions with special emphasis on sideslip has been established. Computational Fluid Dynamics (CFD) has been used to study flowfields over experimentally investigated …
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Techniques for compressible flow calculations on multi-zone grids
… order to simulate inviscid/viscous compressible flowfields about 3-D realistic aerodynamic bodies, the combined use of an implicit, upwind biased real gas scheme with 3-D fully conservative patched grid techniques is discussed. An "equivalent" gamma formulation is implemented in order to model …
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Flow Visualizations and Measurements of Turbulent Structures in Drag-Altered Axisymmetric Compressible Base Flows
… mean structure statistics of all drag-altered flowfields demonstrate that the dominant organization present upstream is significantly weakened or lost due to passage through these regions. When the base bleed rate is sufficient to inhibit the formation of the primary recirculation region, the …
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Lagrangian Parcel Volume method applied to icing surfaces to predict impact efficiency
… into the code: Large Eddy Simulations (LES). LES flowfields are needed to describe upstream unsteadiness and flow separation for complex geometries. Two geometries were studied in these LES simulations: a clean four inch diameter cylinder and a large glaze ice model (mounted on a two inch diameter …
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Aerodynamic Interactions in Vortex Tube Separator Arrays
… which likely feature significantly more complex flowfields than singular VTSs due to aerodynamic interactions between the devices. The research presented in this dissertation identifies and explains flow features unique to arrays by means of an experimental investigation downstream of various VTS …
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Airfoil response to periodic disturbances: the unsteady Kutta condition
… of both the pitching and the fixed airfoils. The flowfields in the wake and at the trailing edges of both airfoils were studied visually. The validity of the quasi-steady and an extension to an unsteady Kutta condition are examined. A new dynamic similarity parameter is proposed. An analytical …
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Local flowfield about large distributed roughness elements in a laminar boundary layer
… boundary-layer thickness. The roughness flowfields were scaled such that the roughness Reynolds number, $Re\sb{k}$, and the ratio of the roughness height to boundary-layer thickness, $k$/$\delta$, were typical of those found in initial glaze-ice accretions. For the isolated roughness …
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Three-dimensional nonequilibrium viscous shock-layer flow over the space shuttle orbiter
… have been obtained for chemically reacting flowfields over the entire windward surface of the space shuttle orbiter at high angles-of-attack. Boundary conditions studied include noncatalytic wall, finite-catalytic wall, fully-catalytic wall, and nonequilibrium slip conditions at the wall …
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An Experimental Investigation of Underbody and Near Wake Aerodynamics of Heavy Goods Vehicles
… differences are found between the mean flowfields of either model. Although the simple geometry already exhibits a weak tendency for inwards flow entrainment from the sides into the underbody, this is exacerbated for the geometrically more complex underside of the detailed model. In the …
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Unsteady propeller hydrodynamics by Dirk H. Renick.
… propulsors operating in highly contracting flowfields. Current algorithms provide valuable insight into qualitative trendlines for these modern designs. This thesis has focused on the more accurate quantitative force prediction by introducing more physical modeling into the numerical …
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