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 92 for “"Large eddy simulations"”.
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Large-Eddy Simulations of Hydrocyclones
… classification process in hydrocyclones using large-eddy simulations of turbulent multiphase flow. Two types of hydrocyclones are considered. The first is a classifying hydrocyclone, and the second is a mineral flotation hydrocyclone, also known as an air-sparged hydrocyclone (ASH). Large-eddy …
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Large Eddy Simulations of complex turbulent flows
… interests is developed using a combination of Large Eddy Simulation (LES) and Immersed Boundary Method (IBM) concepts. LES is an intermediate approach to turbulence simulation in which the onus of modeling of “universal” small scales is appropriately transferred to the resolution of …
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Large eddy simulations of bluff-body wakes on parallel computers
… research was to investigate the applicability of large-eddy simulations to predict the characteristics of turbulent wakes of bluff bodies. The problem considered concerns turbulent flow over a square cylinder placed normal to a uniform free stream. The Reynolds number selected for the simulations …
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Very large eddy simulations of spatially evolving supersonic turbulent shear layers
… compressibility for supersonic shear flows. Very Large Eddy Simulations (VLES) were performed based on the two-dimensional unsteady Euler equations without any empirical coefficients for turbulence modeling. These equations were used to study the spatially evolving mixing characteristics of …
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Analysis of Model-Free Control of Wind Farms Using Large-Eddy Simulations
… maximization have been evaluated using numerical simulations of the flow through wind farms. A model-free approach does not require a priori assumptions on the physical system, but learns on-line the system dynamics, avoiding modeling uncertainties. The control strategies are based on …
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Large-eddy simulations of recirculation zones in channel-type molten salt reactors
… Laboratory during the 1960s. Thermal-hydraulic simulations of this reactor are an important step towards validating and verifying simulation tools for other molten salt reactor designs and exploring the potential of such reactors for licensing. Modern CFD simulations of the MSRE reactor core …
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Large eddy simulations of hydrogen/methane jets in crossflows under engine-relevant conditions
… these concerns by employing high-fidelity Large Eddy Simulations (LES) with a presumed joint probability density function (PDF) model to investigate partially premixed combustion of hydrogen and hydrogen-methane blends in JICF configurations. The study focuses on three key aspects: (1) the …
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Large eddy simulations of premixed turbulent flame dynamics : combustion modeling, validation and analysis
… and active control strategies are critical to large-scale implementation. For the numerical study of such systems, large eddy simulation (LES) techniques with appropriate combustion models and reaction mechanisms are highly appropriate. These approaches balance the computational complexity and …
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Large Eddy Simulations of high Reynolds number Complex Flows with Synthetic Inlet Turbulence
The research was motivated by the desire to use Large Eddy Simulations (LES) to calculate liner heat transfer in industrial scale gas turbine combustors, which operate at high Reynolds numbers and high Swirl numbers. LES has several challenges which need to be surmounted for general application to …
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Large Eddy Simulations of Particle Dispersion and Deposition in a Turbulent Square Duct Flow
… a square duct is the focus of the second set of simulations. Ten particle response times are studied. Simulations are carried out using one-way coupling as well as select cases using two- and four-way coupling. A particle-particle collision algorithm has been developed. PDFs of deposition …
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Large eddy simulations of turbulent flows on graphics processing units: application to film-cooling flows
Computational Fluid Dynamics (CFD) simulations can be very computationally expensive, especially for Large Eddy Simulations (LES) and Direct Numerical Simulations (DNS) of turbulent flows. In LES the large, energy containing eddies are resolved by the computational mesh, but the smaller (sub-grid) …
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Wall Modeled Large-Eddy Simulations in Rotating Systems for Applications to Turbine Blade Internal Cooling
Large-Eddy Simulations (LES or wall-resolved LES, WRLES) has been used extensively in capturing the physics of anisotropic turbulent flows. However, near wall turbulent scales in the inner layer in wall bounded flows makes it unfeasible for large Reynolds numbers due to grid requirements. This …
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Idealized particle-resolved large-eddy simulations to evaluate the impact of emissions spatial heterogeneity on CCN activity
Aerosol-cloud interactions remain a large source of uncertainty in climate models due to complex, nonlinear processes that alter aerosol properties and the inability to represent the full compositional complexity of aerosol populations within large-scale modeling frameworks. The spatial resolution …
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Large Eddy Simulations of Sand Transport and Deposition in the Internal Cooling Passages of Gas Turbine Blades
… often operate under dirty conditions where large amounts of particulate matter can be ingested, especially, sand, ash and dirt. Particulate matter in different engine components can lead to degradation in performance. The objective of this dissertation is to investigate sand transport and …
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Study of dynamics of airflow and aerosol transport and deposition in human upper airways using large-eddy simulations
This study employs a large-eddy simulation (LES) strategy to investigate airflow and aerosol dynamics in the human upper airways using a truncated SimInhale configuration. Inflow conditions include three steady inhalation flow rates (14.2, 53.2, and 71 L/min), representing quasi-laminar, moderate, …
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Argon bubble transport and capture in continuous casting with an external magnetic field using GPU-based large eddy simulations
… to this important industrial process can have large economic impact. In the continuous casting of steel process, argon gas is usually injected at the slide gate or stopper rod to prevent clogging, but entrapped bubbles may cause defects in the final product. Many defects in this process are …
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Investigation of transition to turbulence at low Reynolds numbers using Implicit Large Eddy Simulations with a Discontinuous Galerkin method
… In addition to being one of the first Implicit Large Eddy Simulation studies using a high-order Discontinuous Galerkin method, unique attention is given to the boundary layer characteristics thus contributing to the understanding of low Reynolds number flows and the related separation-induced …
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Large Eddy Simulations of Flow and Heat Transfer in the Developing and 180° Bend Regions of Ribbed Gas Turbine Blade Internal Cooling Ducts with Rotation - Effect of Coriolis and Centrifugal Buoyancy Forces
… body forces further complicates the flow. Large Eddy Simulations are used to study these flows because of their ability to predict the unsteady flow effects and anisotropic turbulence more reliably than traditional RANS closure models. Calculations in a stationary duct are validated with …
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