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 222 for “"CFD simulations"”.
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Multiscale CFD simulations of entrained flow gasification
… were designed before it was practical to apply CFD models. Moreover, gasification CFD models developed over the years may have lacked accuracy or have not been tested over a wide range of operating conditions, gasifier geometries and feedstock compositions. One reason behind this shortcoming is …
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Assessment of Varying Model Representations in CFD Simulations
… representation of computational fluid dynamics (CFD) simulations in two case studies. Product and process realization in engineering design requires substantial resources (time and money) in order to test novel designs for effectiveness. In recent decades, engineering has been relying more …
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Automated feature extraction of shear layers in CFD simulations
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
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Framework for Integrated Multi-Scale CFD Simulations in Architectural Design
… design problem. Computational Fluid Dynamics (CFD) analysis is one of the approaches that have gained popularity in the testing of architectural design solutions especially for purposes of evaluating the performance of natural ventilation strategies in buildings. Natural ventilation strategies …
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Validation of CFD Simulations for Hypersonic Flow Over a Yawed Cone
… wind tunnel experiment at Cal Tech. The six simulations cases are conducted for yaw angles of 0, 8, 12, 16, 20 and 24 degrees. The unsteady Reynolds-Averaged compressible Navier-Stokes solver with Spalart-Allmaras (SA) turbulence model is employed. The upstream flow Mach number is M = 8 and …
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Mixed-fidelity CFD Simulations for Aero-engines: A Fan-intake Interaction Study
… resources. To make it possible, a mixed-fidelity CFD method based on the Immersed Boundary Method (IBM) is proposed. In this hierarchical method, geometries can be replaced by forces, i.e. the standard IBM or eIBM, whereas turbulence can be resolved by the Large Eddy Simulation. The thesis …
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CFD Simulations of an Air-Conditioned Radiological Materials Staging Room: Comparison Between COMSOL and ANSYS Codes
… steady-state computational fluid dynamics (CFD) simulations of a potential ventilated radiological-material-package staging facility to assess the surface temperatures of the packages using two CFD codes: ANSYS/Fluent finite volume and COMSOL finite element codes. The simulated facility …
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CFD Simulations of Chemical Looping Combustion in a Packed Bed and a Bubbling Bed Fuel Reactor
… of experimental studies on CLC in recent years, CFD simulations have been limited in the literature on CLC. The development and confidence in high-fidelity simulations of the CLC process is a necessary step towards facilitating the transition from laboratory-scale experiments to deployment of …
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On the integration of Computational Fluid Dynamics (CFD) simulations with Monte Carlo (MC) radiation transport analysis
… develops a coupled Computational Fluid Dynamics (CFD) and Monte Carlo (MC) Radiation Transport approach to this problem. Via particulate injections, the CFD simulation defines the spatial distribution of radioactive particulates and this distribution is then employed by the MC Radiation Transport …
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Computational fluid dynamics (CFD) simulations of temperature distribution in traditional and automated dairy buildings under changing climate
… applied validated computational fluid dynamics (CFD) modeling to develop and evaluate energy-efficient ventilation and cooling strategies across three primary dairy housing systems: cross and tunnel-ventilated free-stall barns, dairy buildings equipped with automated milking systems (AMS), and …
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Mechanisms of Particle Separation in Aerodynamic Air Cleaning
… different physical models with the assistance of CFD simulations. In CFD simulations, user defined functions were strongly recommended for calculating the particle separation efficiency.
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Experimental and Numerical Investigation of Forward and Aft Swept Stepped Planing Hulls in Calm Water and Regular Waves
… Stokes (RANS) computational fluid dynamics (CFD) simulations are used to evaluate the calm water performance, dynamic stability, and regular head wave response of two stepped hull models. Calm water experiments on two stepped hull models at varying displacement, longitudinal center of gravity …
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Design optimization of aerodynamic drag at the rear of generic passenger cars using nurbs representation
… car model. The computational fluid dynamics (CFD) simulations were performed on these geometries to obtain drag coefficients. Once the results of CFD simulations were available, a response surface model was constructed using linear regression technique. Finally, the design exploration was …
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Interaction between turbulent flow and saturated porous media
… investigated using computational fluid dynamics (CFD) simulations, flow visualisation experiments and laser Doppler velocimetry (LDV) measurements.
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Pressure losses at bends and junctions
A series of computational fluid dynamics (CFD) simulations and experiments were performed to study the flow in bends and junctions, to determine whether the CFD simulations could yield accurate pressure loss data for input into a one-dimensional engine simulation code. The experiments were carried …
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Numerical Simulation of Viscous Flow: A Study of Molecular Dynamics and Computational Fluid Dynamics
… dynamics (MD) and computational fluid dynamics (CFD) allowresearchers to study fluid dynamics from two very different standpoints. From a microscopic standpoint, molecular dynamics uses Newton's second law of motion to simulate the interatomic behavior of individual atoms, using statistical …
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Experimental and Numerical Investigations of the Thermal Environment in Air-cooled Data Centers
… evaluate Reynolds Averaged Navier-Stokes (RANS) CFD as a tool to accurately predict the temperature distribution in air-cooled data centers with the aid of high quality test data. A data center research laboratory (RL) was constructed and heavily instrumented to measure power, flow rates, …
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Wind- and thermal-driven air flows and the buoyancy and advection effects on air exchange within urban environments
… buoyancy effects, computational fluid dynamics (CFD) simulations are performed. The aspect ratio (H/L, H height of the buildings and L the width between the buildings) is varied. The results show that the air flow within urban areas can be considered to be purely buoyancy driven when the B …
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Transcatheter Mitral Valve Replacement: Structural and Hemodynamic Analysis
… Magna mitral valve and finite element (FE) simulations were conducted to obtain the stress distribution on both valves. Moreover, to visualize the flow field within the left heart, steady-state computational fluid dynamics (CFD) simulations were run. The FE simulations demonstrated that in a …
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Investigating the Effect of an Upstream Spheroid on Tandem Hydrofoils
… unsteady Reynolds Averaged Navier-Stokes CFD simulations used to investigate the influence of an upstream prolate spheroid body on tandem pitching hydrofoils. The model is validated by performing separate CFD simulations on the body and pitching hydrofoils and comparing results to existing …
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