Global ETD Search
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Showing 1 to 16 of 16 for “"Aerodynamic Flows"”.
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Verification of Statistical Turbulence Models in Aerodynamic Flows
… size, specifically for the finest meshes. The flows' mean velocity, skin friction coefficient, and turbulent variable profiles obtained with OpenFOAM are in agreement with NASA's profiles for both cases. The grid convergence studies show that the differences between OpenFOAM and NASA results …
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Unbiased Filtered Rayleigh Scattering Measurement Model for Aerodynamic Flows
… has become an attractive technique for advanced aerodynamic measurements. The appeal of FRS is that it can simultaneously quantify density, temperature, and vector velocity. Additionally, it is entirely non-intrusive to the flow since the technique leverages how laser light scatters off of …
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An adaptive variational multiscale method with discontinuous subscales for aerodynamic flows
… for accurate and efficient simulation of aerodynamic flows is output-based mesh adaptation, which optimizes a mesh to minimize the discretization error in an output of interest. The state of the art in output-based adaptation uses the discontinuous Galerkin (DG) method, which is …
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Hamiltonian Paths and Strands for Unified Grid Approach for Computing Aerodynamic Flows
A solution algorithm using Hamiltonian paths and strand grids is presented for compressible Reynolds-Averaged Navier–Stokes (RANS) formulation as a unified grid approach. The hidden line-structure is robustly identified on the general unstructured grid with mixed elements which provides a framework …
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Silicon micromachined sensors and sensor arrays for shear-stress measurements in aerodynamic flows
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Stability of Beams, Plates and Membranes due to Subsonic Aerodynamic Flows and Solar Radiation Pressure
… of beams, plates and membranes due to subsonic aerodynamic flows or solar radiation forces. Beams, plates and membranes are simple structures that may act as building blocks for more complex systems. In this dissertation we explore the stability of these simple structures so that one can predict …
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Ultraviolet (UV) Laser Implementation, Signal Model, and Measurement Sensitivities in Filtered Rayleigh Scattering for Aerodynamic Flows
… static temperature, and static density of aerodynamic flows. Development of the FRS technique has typically employed 532 nm Nd:YAG lasers coupled with the use of iodine vapor cells as the molecular filter. One method to improve the effective signal-to-noise ratio (SNR), and therefore the …
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High-order implicit large-eddy simulation for transitional aerodynamics flows
… (ILES) approach for simulating transitional aerodynamic flows. The approach consists of a hybridized Discontinuous Galerkin (DG) method for the discretization of the Navier-Stokes (NS) equations and a parallel preconditioned Newton-GMRES solver for the resulting nonlinear system of equations. …
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Domain decomposition preconditioners for higher-order discontinuous Galerkin discretizations
Aerodynamic flows involve features with a wide range of spatial and temporal scales which need to be resolved in order to accurately predict desired engineering quantities. While computational fluid dynamics (CFD) has advanced considerably in the past 30 years, the desire to perform more complex, …
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Numerical study of linearized unsteady stagnation flow
… long been recognized as an important problem in aerodynamic analysis. Boundary layer disturbances located near the stagnation line can have a significant effect on the overall properties of an airfoil. One example of current interest is the analysis of unsteady multi-phase stagnation flows for …
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Least Squares Shadowing for sensitivity analysis of large chaotic systems and fluid flows
… engineers have used these methods to optimize aerodynamic shapes and aircraft configurations, automatically adapt the computational mesh to reduce errors in Computational Fluid Dynamics (CFD) simulations, and to quantify uncertainties in these simulations. However, conventional sensitivity …
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Parametrization-independent elliptic surface grid generation
… widely used in areas such as the computation of aerodynamic flows. Elliptic grid generation is the leading structured grid generation method and creates high-quality grids for simple geometries. However, when applied to surfaces in three dimensions, problems are encountered among other things …
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An optimization framework for adaptive higher-order discretizations of partial differential equations on anisotropic simplex meshes
… of the proposed method in solving complex aerodynamic flows exhibiting a wide range of scales. Fourth, fully-unstructured space-time adaptivity is realized, and its competitiveness is assessed for wave propagation problems. Finally, the framework is applied to enable spatial error control …
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Detached Eddy Simulation of Turbulent Flow and Heat Transfer in Turbine Blade Internal Cooling Ducts
… feasible solutions of high Reynolds number flows undergoing massive separation with reliable accuracy. Since its inception, DES has been applied to a wide variety of flow fields, but mostly limited to unbounded external aerodynamic flows. This is the first study to apply and validate DES to …
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Transonic aeroelastic analysis of systems with structural nonlinearities
… behavior and performance characteristics. Aerodynamic flows at transonic Mach numbers generate nonlinear aerodynamic forces on the wing affecting the aeroelastic response of the wing. Analysis techniques accounting for these structural and aerodynamic nonlinearities, and an understanding of …
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Contributions to the Understanding of Ship Airwakes Using Advanced Flow Diagnostic Techniques
… the complex, three dimensional, unsteady aerodynamic flows produced by the superstructure of a ship, which is referred to as an airwake. This problem is relevant and important because the turbulent airwake significantly and adversely affects the ability for rotorcraft to operate safely …