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 17 of 17 for “"Moving Wall"”.
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MOVING WALL JET FLOW NEAR CHANNEL EXIT AT MODERATE REYNOLDS NUMBER
… emerging from a channel and flowing along one moving plate, while the other plate is stationary, is examined theoretically in this study. In this case, the equations of motion are reduced by expanding the flow field about the basic Couette flow. Inertia is assumed to be large enough, allowing …
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Numerical Simulation of Plasma-Based Actuator Vortex Control of a Turbulent Cylinder Wake
… investigation implements a straightforward moving wall boundary condition to model the actuator's effects on the flow. Validations of the moving wall for this simulation are set forth with the understanding that the moving wall can model the plasma actuator bulk flow effects at a distance …
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Near Wall Investigation of Three Dimensional Turbulent Boundary Layers
… flows. The investigation focuses on near wall measurements in these flows. Several experimental techniques are used in the studies; however, the bulk of the investigation focuses on a three-orthogonal-velocity-component fiber-optic laser Doppler anemometer (3D-LDA) system. The control …
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Some Features of Tip Gap Flow Fields of a Linear Compressor Cascade
… and 3.3%). The experiments focus on near-wall flow field measurements for the stationary wall and moving wall, and static pressure measurement on the low end-wall for the stationary wall case. The representative flows were pressure driven, three-dimensional turbulent boundary layers in the …
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Optimization of an airfoil's performance through moving boundary control
… implementation difficulties of its application, moving wall boundary-layer control methods have mainly relied on experimental research. The moving wall concept is principally applied as a rotating cylinder protruding into the airfoil. The purpose of this thesis is to provide a computational base …
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Liquid metal brushes for homopolar devices
… in a narrow gap between a fixed surface and a moving surface, with a strong applied magnetic field and with a free surface beyond each moving end of the gap. The radial and axial velocities in the secondary flow are reduced by a strong axial or radial magnetic field. For a sufficiently strong …
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USE-LESS Building
… was explored through three elements, an existing wall that is preserved, a wet wall that houses services, and a moving wall that changes according to the user's will. This site specific approach to design, rather than program specific, enables the structure to adapt to the social and economic …
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Oscillatory Flow Mechanism for Enhanced Heat Transfer
… behind this is to induce oscillation of the end wall of one of two connected chambers of a heat exchanger which effectively will induce oscillation of the boundary layer within the connecting duct. The main idea of this thesis came from using species separation studies before 40 years ago in …
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Near Wall Behavior of Vortical Flow around the Tip of an Axial Pump Rotor Blade
… with 3.3% chord tip clearance with and without moving endwall simulation. Experimental measurements have been completed in Virginia Tech low speed linear cascade wind tunnel. A 24" access laser-Doppler velocimeter (LDV) system was developed to make simultaneous three-velocity-component …
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Modeling, analysis and numerical simulation of reactive solute transport problems in moving domains
… a cylindrical channel with compliant adsorbing walls. The solutes are dissolved in a fluid flowing through the channel. The fluid, which carries the solutes, is viscous and incompressible. The problem is modeled by a convection-diffusion adsorption-desorption equation in moving domains. First, …
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A Mathematical Analysis of Digestive Processes in a Model Stomach
… of the Dynamic Gastric Model, where gentle wall movements and gastric secretions result in the outside layer of the digesta “sloughing off”, before passing into the bottom section for further processing. By considering a simplified, local description of the flow close to the wall, we may …
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Novel Bioinspired Pumping Models for Microscale Flow Transport
… observed to be induced by the rhythmic tracheal wall contractions. These networks have been shown to mange fluid very efficiently compared to current state-of-the-art microfluidic devises. This dissertation presents two versions of a novel bioinspired pumping mechanism that is neither peristaltic …
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Microparticle Influenced Electroosmotic Flow
… in which the particles were held stationary. A moving wall model was utilized to account for the particle velocity and the wall-induced electroosmotic flow. The particle-induced electroosmotic flow was also accounted for. A range of particle velocities were imposed in order to study the flow …
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Tip Leakage Flow Downstream a Compressor Cascade with Moving End Wall
A large-scale moving end-wall system has been designed and built at the Aerospace and Ocean Engineering Department of Virginia Tech. This system forms part of a low-speed linear compressor cascade wind tunnel, where it is used to simulate the effects of the relative motion between the blade tips …
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Computational fluid dynamics as aid tool for the management of aortic wall diseases
… Moreover, the deformability of the aortic wall appears to be related to its strength: areas at elevated strain may, therefore, indicate structural weakening. Based on these understandings, this research work proposes the use of hemodynamic descriptors, derived from CFD simulations, to …
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Numerical Simulations in Electro-osmotic Flow
… in a parallel plate microchannel, induced by wall motion, has been modeled numerically. This type of flow simulates the physical driving mechanism that exists in electro-osmotically generated flow with large channel diameter-to-Debye length ratios (Z). The physics of the flow field were …
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Measurements of the Tip-gap Turbulent Flow Structure in a Low-speed 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 visualizations were made on a stationary endwall to obtain the flow features and to determine the …