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 42 for “"pressure coefficient"”.
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Experimental study of earth pressures on retaining structures
… and field experimental studies of earth pressures exerted on retaining structures and laboratory studies of the at-rest earth pressure coefficient are summarized. The current methods used to evaluate the earth pressures due to compaction are reviewed. The design features of a new …
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Flowfield measurements in the vortex wake of a missile at high angle of attack in turbulence
… of this thesis is to experimentally validate the pressure measurement system for flowfield variables with elevated levels of turbulence; to determine the location and intensity of the asymmetric vortices in the wake of the VLSAM model at a raised level of freestream turbulence; and to display the …
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Tip leakage flow in a linear turbine cascade
… based on the axial chord of 4.5 x 10⁵. Static pressure measurements were made on the blades and on the endwall with particular attention given to the tip gap. Also, flow visualizations on the endwall and on the suction surface of the middle blade were performed. From the pressure measurements, …
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Wind flow characteristics and their effects on low-rise buildings
… are studied in terms of flow characteristics and pressure-generating mechanisms. Major fmdings contribute to understanding the mechanisms of pressure generation and the roles of turbulence and other properties of the incident wind in loading effects. Much of the debate on wind-tunnel simulation …
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Flowfield study of a close-coupled canard configuration
A nulling five-hole pressure probe was used to complete a flowfield survey behind a close-coupled canard and wing model set a 32 degrees angle of attack. The canard and wing were both low-aspect-ratio, highly swept, delta platforms with rounded leading edges. The model was set at to condition of …
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Large Eddy Simulation and Wavelet Analysis of the Flow Field around a Surface Mounted Prism
… resulting in secondary separation and severe pressure fluctuations. Moreover, the interaction of the large-scale vortices with the multiplicity of turbulence scales in the incoming wind exacerbates their unsteady motion and hence significantly affects the pressure fluctuations spectra …
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3D Aerodynamic Optimization of NREL VI Wind Turbine Blade for Increased Power Output and Visualization of Flow Characteristics
… above is well captured by the boundary layer and pressure coefficient plots agree well with the transition location.</p>
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Assessment of Formulations for Numerical Solutions of Low Speed, Unsteady, Turbulent Flows over Bluff Bodies
… used for comparison: aerodynamic forces, mean pressure coefficient, Strouhal number, mean velocity magnitude and turbulence intensity. The main results can be summarized as follows. First, the predictions are more sensitive to the turbulence model choice than to the choice of algorithm. The …
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Experimental and Numerical Investigations of the Aerodynamics of Flexible Inflatable Wings
… were taken in the form of Pitot and static pressure measurements in the wake of the wing, force and moment measurements at the base of the mount, and tension measurements at the tether attachment locations. This provides a data set for validating static aeroelastic modeling approaches for …
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Effective CFD Integration into Product Development and Validation of Wind Tunnel Data for Transonic Launch Vehicle
… fluid dynamics in predicting the steady-state pressure coefficient of a launch vehicle under transonic conditions. The results from the computational fluid dynamics simulations are then compared to experimental data from NASA Technical Memorandum X-778. The results indicate a process to …
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Investigation of Pin Fin Cooling Channels for Applications in Gas Turbines
… produce superior matching of heat transfer coefficients to experimental data. Comparisons have also shown that depending on Reynolds number, the RK-E and QRK-E models match pressure coefficient data the closest. An investigation of a biomimicry pin channel created using the undulations …
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Development of designer-relevant Lattice-Boltzmann Wind Field Model for urban canyons and their neighborhoods
… CFD tools for both wind velocity and pressure fields. To further enhance the computational efficiency, proper settings of inlet wind profile and optimal modeling domain size are investigated for the LBWFM. And the relative wind pressure coefficient calculated out of the model is then …
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An experimental study of exit flow patterns in a multistage compressor in rotating stall
High-response pressure measurements of a high-speed, 10- stage, axial-flow compressor operating in rotating stall are analyzed. Procedures used to digitize analog voltages and calibrate pressure transducers are presented. From total and static pressures measured at the exit of the test compressor, …
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Performance monitoring and numerical modelling of a deep circular excavation
… wall thickness and the at rest lateral earth pressure coefficient in the Chalk. The results showed that the wall thickness has a minor influence on its deflection and hence thinner walls might be feasible for future shafts. The at rest lateral earth pressure coefficient of the Chalk appeared …
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Correlation between Unsteady Loading and Tip Gap Flow Occurring in a Linear Cascade with Simulated Stator-Rotor Interaction
… and the tip blade loading were made using static pressure taps. The tip loading shows that the minimum suction surface pressure coefficient increases in magnitude linearly up to a tip clearance of 7.9% chord. Unsteady pressure was measured on the pressure and suction surfaces at the tip of two …
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Sensitivity of Steel Purlins to Changes in Application of Wind Loads
… used to model a realistic wind load scenario. Pressure coefficient data recorded in the database was applied statically to individual purlins in a typical design for the size of buildings studied. These results were then compared to those obtained using the wind design provisions in ASCE 7-16 …
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Wind pressure coefficients for gable roofs of intermediate slopes
… of Civil Engineers. Local and area-averaged roof pressure coefficients have been obtained from the wind tunnel measurements. Extreme value analysis has been performed to establish the peak pressure coefficient values. This thesis presents a comparative study based on the experimental data, which …
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Laminar, steady and unsteady flow over inclined plates in two and three dimensions
… for the Finite Element Method with the pressure determined by a penalty approach. The influence of grid resolution, boundary conditions and size of the domain was studied. The true nature of the flow for different Reynolds numbers was also examined through steady and unsteady simulations …
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The development of reynolds averaged navier stokes solver for a two dimensional compressible flow problem
… the experimental result in terms of distribution pressure coefficient along the airfoil surfaces at different angles of attacks and Mach numbers. The comparison result over these two airfoil models had found that the developed RANS solver was able to produce the results closed to the experimental …
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Hydrodynamic lubrication and coating of wire using a polymer melt during drawing process.
… the polymer feed into a viscous melt and the pressure required is generated by a hydrodynamic action produced by the motion of the wire. On the basis of experimental evidence, it is apparent that deformation commences before the wire reaches the die, in the Christopherson tube itself, with the …
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