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Showing 1 to 20 of 34 for “"Hypersonic Flows"”.
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Numerical Investigations of Magnetohydrodynamic Hypersonic Flows
… simulations of magnetohydrodynamic (MHD) hypersonic flow are presented for both laminar and turbulent flow over a cylinder and flow entering a scramjet inlet. ANSYS CFX is used to carry out calculations for steady flow at hypersonic speeds (Mach number > 5). The low magnetic Reynolds …
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THE NEWTONIAN APPROXIMATION IN DUSTY HYPERSONIC FLOWS.
Dept. of Mathematics and Statistics. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1979 .W553. Source: Dissertation Abstracts International, Volume: 40-09, Section: B, page: 4335. Thesis (Ph.D.)--University of Windsor (Canada), 1979.
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Modeling of boundary layer thermochemistry in hypersonic flows
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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High dimensional uncertainty propagation for hypersonic flows and entry propagation
… This is important for the analysis and design of hypersonic objects and vehicles, which have to operate in extreme conditions.;In this work, two approaches for a high dimensional uncertainty quantification (UQ) are developed. The first approach performs a single-fidelity non-intrusive forward UQ, …
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Reduced-order model framework for thermochemical non-equilibrium hypersonic flows
The study of vehicles traveling at hypersonic speeds is extremely complex and involves many different non-equilibrium physical phenomena occurring on many different time-scales. As a result, work focused on modeling this type of flowfield has been hindered by inaccurate physical and chemical …
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Laminar/transitional shock-wave/boundary-layer interactions (SWBLIs) in hypersonic flows
… interactions (SWBLIs) in hypersonic flow have been carried out at M? = 6.85 and M? ? 8, with unit Reynolds numbers ranging from 2.0 x 106 m- l to 7.60 x 106 m- l. This thesis deals with a simplified 2-D geometric configuration to simulate SWBLIs on vehicle surfaces or …
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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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Computation of Hypersonic Flows with Lateral Jets Using k-ω Turbulence Model
… proposed for drag and heat flux reduction in hypersonic nose cones. Numerical simulations are conducted to analyze the effectiveness of spike-lateral jet concept at re-entry altitudes. The spike attached to the hemispherical nose has two circular orifices which eject air. The freestream …
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Reduced-order modeling of non-Boltzmann thermochemistry and radiation for hypersonic flows
… non-equilibrium aerothermal environment during hypersonic flows is determined by the interaction between a multitude of disparate physical phenomena with varying characteristic time scales. The multi-physics nature of this flight regime renders the task of accurately estimating vehicular …
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Analysis of Stresses in Metal Sheathed Thermocouples in High-Temperature, Hypersonic Flows
… temperature sensing remains important for many hypersonic aerodynamics and propulsion applications. Flight test applications, in particular, demand robust and accurate sensing, making thermocouple sensors attractive. Even for these extremely well-developed sensors, the prediction of stresses …
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Modeling of non-equilibrium effects on a double wedge configuration in hypersonic flows
… are extensively used for the modeling of hypersonic flows characterized by thermal and chemical non-equilibrium phenomena. The accurate modeling of non-equilibrium effects relies on knowledge of reaction rate constants and relaxation parameters, often extrapolated outside their range of …
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Continuum breakdown assessment and state-based transport modeling for non-equilibrium hypersonic flows
… used for predicting flowfield properties during hypersonic (re)entry of space vehicles into planetary atmospheres. Commonly employed numerical approaches for simulating the thermal and chemical non-equilibrium encountered in these high speed flows are multi-temperature computational fluid …
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Application of Ab-initio Quantum Chemistry Techniques to Hypersonic Flows for Plasma Blackout Alleviation
Plasma blackout in hypersonic flows produced by weakly-ionized air plasma sheaths is a phenomenon that attenuates or completely blocks communications with vehicles flying in a high-enthalpy flow environment. The ability to mitigate this issue can be useful from various re-entry vehicles to …
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Quantification of Spalart-Allmaras Turbulence Modeling Uncertainties for Hypersonic Flows Utilizing Output-Based Grid Adaptation
… equations is quantified for steady non-reacting hypersonic flows using a coarse-grained uncertainty metric. Output-based adaptation is utilized to guarantee negligible numerical error with complex flow features, such as shock wave-boundary-layer interactions (SBLI). The adapted meshes are …
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A finite element segregated method for thermo-chemical equilibrium and nonequilibrium hypersonic flows using adapted grids
… method for the numerical simulation of 2-D hypersonic, thermo-chemical equilibrium and nonequilibrium flows, with an emphasis on resolving directional flow features, such as shocks, by an anisotropic mesh adaptation procedure. Since the flow field of such problems is chemically reacting and …
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A numerical study of hypersonic flows using the full Navier-Stokes equations with different air models
… a real gas are investigated numerically in the hypersonic flow regime.
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Three-dimensional viscous hypersonic flows over general bodies using shock-layer and parabolized Navier-Stokes equations
The three-dimensional viscous hypersonic flowfield over blunted cones at large angles of attack, including crossflow separation, has been solved using both viscous shock-layer (VSL3D) and parabolized Navier-Stokes equations (PNS). The viscous shock-layer equations have been used for the solution of …
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Evaluation of a displacement-body model for hypersonic shock-wave/boundary-layer interaction
… flow regimes, as well as for Mach numbers in the hypersonic regime. Additionally, the model provides a physical explanation for the pressure drop observed downstream of reattachment in hypersonic flows.
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