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Showing 1 to 20 of 217 for “"Aerodynamics and Fluid Mechanics"”.
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A Computational Analysis of the Aerodynamics and Aeroacoustics of Jets with Fluid Injection
<p>A detailed numerical analysis of fluidic injection as a tool to reduce noise emission is presented here. The noise reduction strategy, developed at the Pennsylvania State University, is based on injectors that blow air into the diverging section of the nozzle to emulate the effect of interior …
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Aerodynamic Performance Enhancement of a NACA 66–206 Airfoil Using Supersonic Channel Airfoil Design
… flows over diamond shaped airfoils by Ruffin and colleagues. The effect of applying these techniques to a NACA 66-206 airfoil is presented. The design domain entails channel heights of 8-16.6% thickness-to-chord and speeds from Mach 1.5-3.0. Numerical simulations show an increase in the …
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Computational Fluid Dynamics Analysis of Inverted, Multi-Element Airfoils in Ground Effect
… amount of traction between the race car’s tires and the ground ultimately allowing the drivers to turn at faster speeds. Commonly used aerodynamic devices are a front and rear wing; the wing cross sections are defined by configurations of multiple 2D airfoils extruded across the wing’s span. This …
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The Effects of Rarefaction and Thermal Non-Equilibrium on a Blunt Body and a Bicone in Hypersonic Flow and Their Shape Optimization for Reducing Both Drag and Heat Transfer
… hypersonic flow are extremely high temperatures and heat transfer to the wall of the spacecraft. At these temperatures, the assumption of thermal equilibrium is no longer valid and the effect of rotational non-equilibrium must be included in the modeling of diatomic gas flow. This thesis employs …
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Crossflow instability and transition on a circular cone at angle of attack in a Mach-6 quiet tunnel
… Quiet Tunnel. Roughness elements with depths and diameters on the order of 500 microns were found to have a significant effect on the generation of the stationary vortices and the location of crossflow-induced transition under quiet flow. Crossflow-induced transition was measured under fully …
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Effect of Adaptive Tabs on Drag of a Square-Base Bluff Body
… of the model for the three speeds at 10, 20, and 30 m/s, with Re = 8.3e4, 1.6e5 and 2.5e5 respectively, without the tabs. Three different tests were performed to determine the effectiveness of the tabs. These tests included base pressure measurements, total drag force measurements and hotwire …
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Aeroacoustics of Supersonic Jet Interacting with Solid Surfaces and its Suppression
… interactions on the noise generation of the jet and its radiation. Numerical analysis of supersonic jet noise involved in these scenarios is investigated by employing Hybrid Large Eddy Simulation – Unsteady Reynolds Averaged Simulation approach to model turbulence.</p> <p>First, the supersonic …
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Using ANSYS Workbench Computer Environment in Turbomachinery Design Process
… focus of designing turbomachinery is to analyze and optimize the aerodynamic efficiency and structural integrity of the machine. The preferred way to perform aerodynamic and structural analysis is to connect the analyses and shorten the analysis time as much as possible. ANSYS, Inc. provides a …
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Development of a Higher-Order Navier-Stokes Solver for Transient Compressible Flows
… validation cases. Firstly, subsonic, transonic, and supersonic flows over the 2‐D bump were simulated, and the results of the code were compared to the results from Fluent. Secondly, the shock‐tube problem was chosen, and the results of the code were compared to the analytical results obtained …
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Effect of Slot Span on Wing Performance
… in the past with regards to their operation and the relation between slot geometry and wing performance. There have also been many studies on the advantages and disadvantages of tip-slotted wings and the comparison between these and full-slotted wings. Up to this point however, a study on the …
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Heat Transfer In Tightly Packed Cylinder Arrays
… between their center points in both the lateral and downstream directions. One option for battery thermal management in hybrid/electric aviation is to use cylindrical batteries packed in arrays with an applied cross flow. In the context of aviation, it is important to maximize space and weight …
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Aerodynamic Trade Study of Compound Helicopter Concepts
… profiles. For each concept, which included lift and/or propulsive compounding, a suite of aerodynamic performance models was developed using energy methods. In the case of a lift-compounded concept, an aerodynamic model representing the force interaction effects of the main rotor wake with the …
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High-Fidelity Modeling of Airfoil Interaction with Upstream Turbulence
… to upstream disturbances, this work proposes and investigates a method to generate a turbulent momentum source to be convected downstream and interact with an SD7003 airfoil in a high-fidelity numerical simulation. A perturbation velocity field is generated from a summation of Fourier …
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Preliminary Test Predictions for Scale Ram-Air Parachute Testing
… the aerodynamic coefficients of lift (𝐶𝐿) and drag (𝐶𝐷) conducted in a wind tunnel. Additionally, a CFD approach where a steady-state parachute shape defined based on experiments, photographs, and literature, is presented. The accuracy of the simulation depends considerably on the ability …
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Numerical Study in Wind Energy Extraction from Controlled Limit-Cycle Oscillations in Modified Glauert Airfoil
… of the MG airfoil to control flow separation and amplify the LCO and energy generation potential of the system. The discussed wind energy harvesting scheme could provide flexibility in allowing installations previously unsuitable to wind turbines due to geometric or low wind velocity …
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Nonlinear Control of Underactuated and Constrained Systems
… or otherwise constrained. To do so, local- and global-coordinate formulations are implemented to generate well-defined system dynamics for a multitude of scenarios. These dynamics are shown to lie on manifolds defined by mathematical restrictions, allowing for singularity-free modeling for …
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Study of Hybrid Magneto-Active Propellant Management Device for Slosh Damping
… of slosh is an ongoing research for many decades and many novel inventions in Propellant Management Devices (PMDs) such as the rigid baffles and elastomeric membranes have been implemented to counteract the free surface effect in both passive and active membrane known as Magneto-Active Propellant …
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A Computer Program for the Coupled Implementation of Meanline and Throughflow Methods to Simplify the Aerodynamic Design of Multistage Axial Compressors
… tool, named C-STAAC, combines the Meanline and Throughflow analysis capabilities of two independent compressor design codes to form one standalone system. The program greatly improves the efficiency of the Preliminary-to-Throughflow stages of compressor design by providing fully coupled …
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Turbulence Control in Wall Jets
… thought. Further, these large scales amplitude and frequency modulate the finer scales of turbulence. This offers a path to control wall turbulence by controlling the large-scales of the flow. The focus of this thesis is to establish ways to manipulate the energy of the large-scale structures in …
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Effect of Thermally Induced Deformation in a Supersonic Combustion Facility
<p>Nastran and ANSYS finite element analysis (FEA) and Wind-US computational fluid dynamics (CFD) solvers are used to simulate the effect of thermal deformation on the reacting flow developing within the University of Virginia (UVa) Supersonic Combustion Facility (SCF). A detailed …
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