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Showing 1 to 20 of 110 for “"flow physics"”.
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Unsteady flow physics of airfoil dynamic stall
… were to perform a detailed analysis of the flow evolution, with particular emphasis on the underlying physical mechanisms, and to extract the dominant scales associated with the flow perturbations, for a canonical dynamic stall process. A series of unsteady surface pressure measurements, …
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Flow physics and air interactions of magnetically driven plasma discharges
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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High Angle of Attack Forebody Flow Physics and Design Emphasizing Directional Stability
A framework 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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The Effects of Active Flow Control on High-Speed Jet Flow Physics and Noise
… of a fully turbulent, compressible jet flow within a large scale anechoic chamber. The investigations are aimed at understanding the complex nature of the jet flow field in an effort to reduce the far-field noise through active flow control and novel reduced-order modeling. The flow …
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Large Eddy Simulation of Leading Edge Film Cooling: Flow Physics, Heat Transfer, and Syngas Ash Deposition
… the outer shear layer but does not influence the flow dynamics in the turbulent boundary layer at the surface. As a result, the turbulent jet decreases adiabatic effectiveness but does not have a substantial effect on the heat transfer coefficient. At B.R.=0.4, three types of coherent structures …
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Experimental and numerical investigations of the off-design flow physics in a supersonic through-flow fan cascade
… and 4.8 x 10⁶, respectively. In addition to mean flow measurements, Reynolds normal and shear stresses were measured as functions of cascade incidence angle and streamwise location in the near-wake and the far-wake. The extremities of profiles of both the mean and turbulent wake properties were …
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Qualitative and Quantitative Study of the Flow Physics in the Vicinity of an Oscillating Plate in Viscous Fluids
… the parameters of oscillation on the resulting flow pattern and analyze their relation to the hydrodynamic forces. More specifically, we classify the flow patterns into different regimes and characterize their unique features. Such classification is based on qualitative properties of the flow. …
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Unsteady Simulations of Flow Around a Smooth Circular Cylinder at Very High Reynolds Numbers Using OpenFOAM
… improved description of incompressible turbulent flows. Wind tunnel experiments for a smooth circular cylinder at very high Reynolds numbers with an incompressible fluid are expensive. The use of Computational Fluid Dynamics, to predict flow around and behind a smooth circular cylinder, is growing …
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Computational Studies of Buffet and Fluid-Structure Interaction in Various Flow Regimes
… computational studies, and its underlying physics are not well-established. The goal of this document is to provide insight into various configurations which produce buffet and attempt to understand the flow physics at play.</p>
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Computational analysis of plasma actuation for control of shock-laden flows in scramjet isolators
… Quasi-DC (Q-DC) plasma actuators for active flow control in scramjet isolators. A computational framework was developed to model internal supersonic flows with plasma actuation. The Reynolds-averaged Navier-Stokes (RANS) equations coupled with Menter’s Shear Stress Transport (SST) turbulence …
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Numerical Study of Mixing of a Supercritical Jet in a Supercritical Environment
… campaign is conducted to better elucidate flow physics and modeling requirements of a supercritical (SC) nitrogen jet injected into a tank of quiescent SC nitrogen. The goals of this work are twofold: to inform the design of injectors and combustion chambers for use in the direct-fired …
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A Computational Approach For Investigating Unsteady Turbine Heat Transfer Due To Shock Wave Impact
… numerical approach is developed to simulate the flow physics present in a previously performed unsteady wind tunnel experiment. The windtunnel experiment included unheated and heated flows over a cascade of highly loaded turbine blades. After the flow over the blades was established, a single …
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IMPLEMENTATION AND PERFORMANCE OF WALL MODELS FOR LARGE EDDY SIMULATION OF NON-EQUILIBRIUM TURBULENT BOUNDARY LAYERS
… of high-Reynolds-number wall-bounded turbulent flows is essential for the understanding and flow control of many engineering applications such as aircraft, turbomachinery, and marine vehicles. Additionally, most practical flows exhibit nonequilibrium effects such as pressure gradient, flow …
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A numerical investigation of self-sustained cavity flow oscillations
Two-dimensional (2-D) cavity flow physics and oscillation control were investigated through solutions of the Reynolds-Averaged Navier-Stokes equations coupled with a two-equation k-? turbulence model. Effects of the leading edge modifications including compression ramps, expansion surfaces and mass …
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Numerical Simulations of Flow past a Triangular Airfoil and in a Sweeping Jet Actuator Using Different Turbulence Models
… goal of this research is to perform 2D turbulent flow simulations to predict the flow past a triangular airfoil used for a Mars air vehicle and in a sweeping jet actuator used for active flow control. Simulations are performed using the commercial CFD software ANSYS Fluent.</p> <p>The thesis …
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Boundary Layer Separation Control on a Salient Back-facing Ramp
… feasibility and the performance of the serration flow control devices on a salient edge where the laminar boundary layer separation is two-dimensional. Three geometries of serrations: a sharp delta, a double delta and a divergent delta are examined on 15° and 30° deflected, backward-facing ramps. …
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Investigating the Interaction of a Supersonic Single Expansion Ramp Nozzle and Sonic Wall Jet
… supersonic jets, have exacerbated the need for flow physics research. Supersonic flight remains the standard for military aircraft and is being rediscovered for commercial use. With the addition of multiple streams, complex nozzle geometries, and airframe integration in modern aircraft, the flow …
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Effects of temperature transients on the stall and stall recovery aerodynamics of a multi-stage axial flow compressor
… aerodynamics of a low speed multi-stage axial flow compressor has been presented. Experiments were conducted on a low speed multi-stage axial flow compression system to demonstrate how a compressor dynamically stalls or recovers from a rotating stall operating condition during an inlet …
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Numerical modelling of plasmas formed and magnetically controlled in hypersonic flows
In high enthalpy hypersonic flows, the pressures and temperatures in the shock layer can become so extreme that dissociation and ionisation reactions produce a weakly ionised plasma. Owing to its elevated electrical conductivity, the plasma can be actively manipulated via magnetohydrodynamic (MHD) …
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