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 151 for “"flow structure"”.
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The flow structure of interacting barchan dunes
… the effects of interacting barchan dunes on the flow structure. The barchan dune models were based upon an idealized contour map, the shape and dimensions of which were based upon previous empirical studies of dune morphology. The experimental setup comprised two, co-axially aligned barchan dune …
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Flow structure of an asymmetric large river confluence
The focus of this study is on flow structure and confluence morphodynamics at a large river confluence with an asymmetrical planform. Five sets of field measurements of three-dimensional velocity components and bed topography at the confluence of the Wabash River and Embarras River along the …
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Heterogeneous flow structure and gas-solid transport of riser
… mechanisms of gas-solid transport and riser flow, investigate heterogeneous flow structures of gas-solid transport and their formation mechanism of the in riser flows, both in axial and radial directions. It provides sound interpretation for the experimental observation and valuable …
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Blade passage flow structure effects on axial compressor rotating stall inception
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1996.
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The flow structure under mixed convection in a uniformly heated vertical pipe
… heat flux of the GFR strongly affects the gas flow under natural circulation. The high heat flux places the flow into a mixed convection regime, which is not yet fully understood. One of the issues of mixed convection is that the transition from laminar to turbulent flow is not clearly defined …
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SPH modeling of the vertical flow structure and turbulence in the swash
The vertical structure of swash-zone flows and turbulence, which is critical to sediment transport and flooding due to over-topping of dunes, will be examined using a Smoothed Particle Hydrodynamics model (DualSPHysics) evaluated with field observations obtained near La Jolla, CA in fall 2003. The …
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A Fixed -Mesh Flow-Structure Solver for Biological Systems With Large Solid Deformations
Currently all our simulations are two-dimensional. The order of the spatial accuracy of the method is analyzed with respect to both the Cartesian mesh spacing and the solid Lagrangian mesh element size. The method is demonstrated by a few example simulations. Finally; we discuss the generalization …
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The Role of Swirl in the Flow Structure and Response of Premixed Flames
… in the scientific community to explore complex flows that posed challenges in the past. This thesis employs this framework to focus on the influence of swirl on both the flow structure and the response of the flame subjected to acoustic perturbations. To achieve those goals a range of bluff body …
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Analysis of the flow structure and reattachment over accelerating non-slender delta-wing planforms
… interest. The collaborative investigation of flow coherent structure, suction side surface pressure, and aerodynamic forces of non-slender delta wings presented here provides critical insight for effective flow-control development, especially for non-slender delta wings at high angles of …
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Measurements of the Tip-gap Turbulent Flow Structure in a Low-speed Compressor Cascade
… from a thorough study of the tip-gap turbulent flow structure in a low-speed linear compressor cascade wind tunnel at Virginia Tech that includes a moving belt system to simulate the relative motion between the tip and the casing. The endwall pressure measurements and the surface oil flow …
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Identification of the Dominant Flow Structure in the Viscous Wall Region of a Turbulent Flow
Made available in DSpace on 2014-12-13T19:55:34Z (GMT). No. of bitstreams: 1 8009061.pdf: 6503395 bytes, checksum: 2ba3468ab8948fd0f0bd59dddc22a135 (MD5) Previous issue date: 1979
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The influence of channel-skewed bedforms on flow structure in a high-amplitude meandering channel
The interaction of flow, sediment transport, and substrate morphology (morphodynamics) leads to complex boundary configurations of ripples, dunes, and bars along alluvial rivers. The instantaneous boundary morphology heavily influences the local flow structure, especially within meander bends, and …
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Tip clearance effects on multistage axial compressor performance and flow structure for small core application
… tip clearance on embedded stage performance and flow structure for clearance-to-span ratios ranging from 1.4% to 5.6% using steady and unsteady three-dimensional viscous flow multistage computations. Embedded stage efficiency displays decreased sensitivity as rotor tip clearance increases with …
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The effect of flow structure on the combustion and heat transfer in a scramjet combustor
… ramp injector using the SPARK computer code. The flow field calculations were compared to the experimental measurements. The experimental tests demonstrated combustor performance with parallel injection comparable to that reported using normal injection. This unusually rapid parallel jet mixing …
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High-resolution spatial and temporal evolution of two-dimensional flow structure at a small stream confluence
… within rivers where interaction between incoming flows produces complex hydrodynamic conditions characterized by distinct spatial patterns of mean or turbulent flow. Despite recognition of this hydrodynamic complexity, few studies have mapped in detail spatial patterns of flow at confluences and …
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A numerical study of flow-structure interactions with application to flow past a pair of cylinders
Flow-structure interaction is a generic problem for many engineering applications, such as flow--induced oscillations of marine risers and cables. In this thesis a Direct Numerical Simulation (DNS) approach based on spectral/hp elements is employed. Structural motion implies changes on the …
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The Influence of Bank Vegetation on Flow Structure Within a Small Agricultural Stream: Implications for Channel Stability
… river banks can have significant effects on the flow, sediment transport, and ultimately channel form. Although past studies in fluvial geomorphology have largely ignored the complicated role ofinstream and bank vegetation, some recent studies have attempted to characterize flow in vegetated …
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Influence of riparian vegetation on near-bank flow structure and rates of erosion on a large meandering river
… autogenic processes such as three-dimensional flow structure, channel planform geometry, and sediment transport. These internal processes can be strongly influenced by the geotechnical properties of the channel banks and floodplains, as well as riparian and in-channel vegetation, modifying …
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Experimental investigation of the near wall flow structure of a low Reynolds number 3-D turbulent boundary layer
… (LDV) measurements and hydrogen-bubble flow-visualization techniques were used to examine the near-wall flow structure of 2-D and 3-D turbulent boundary layers (TBLs) over a range of low Reynolds numbers. The goals of this research were (1) an increased understanding of the flow physics …
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Turbulent Flow Over Rough Surfaces
… obtain a better understanding of the turbulent flow structure in repeated-rib geometry rough-walled surfaces in two size pipe systems as a function of the ratio of roughness height to spacing distance between the elements (P/K), the axial variation of the flow, and the flow rates. The variations …
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