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 55 for “"CFD modelling"”.
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Multiphase CFD modelling of stirred tanks
… methods using computational fluid dynamics (CFD). Among the various numerical works presented, emphasis was laid mainly on single phase systems. However, due to the various processes involving gas-liquid systems, the need for multiphase modelling of stirred tanks became increasingly …
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CFD modelling of flow distortion using OpenFOAM
… thesis presents a computational fluid dynamic (CFD) study of flow related to wind engineering. The open source CFD code OpenFOAM was applied to three cases (i) flow over an oil platform, (ii) flow over a complex terrain and (iii) flow over a met mast. In order to verify the results, experimental …
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Intelligent control system for CFD modelling software
… of emulating the human ability to control CFD simulations and provide similar benefits in terms of performance, overall reliability and result accuracy. We initially consider the rule-based approach proposed by other researchers. It is argued that heuristic search is better suited to model …
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Passive micromixers for DNA analysis using CFD modelling
… is conducted using computational fluid dynamics (CFD) approach using ANSYS Fluent and CFX Software for different geometries designed. Different geometric configuration were proposed and used: bottleneck near the inlet and along the zig zag and curved shaped rectangular zig zag geometry. Mixing …
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CFD modelling of pipe erosion under multiphase flow regimes.
… in elbows mounted in series. Results from both modelling techniques were compared. Results show that phase distribution plays a vital role in estimating erosion in complex multiphase flows. The presence of a separation distance results in a change in phase distribution before the first and …
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CFD modelling of flow-induced vibration under multiphase flow regimes.
… diameters (I.D.). An integrated high-fidelity CFD and FEA-based numerical-analytical modelling framework was applied, to predict the defining characteristics of MFIV in the pipes. The CFD simulations of thirty-five cases of slug, cap bubbly and churn turbulent flow-induced fluctuations at the …
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CFD modelling of fluid flow and contaminant transport in hydrogeological systems
… of various aspects of hydrogeological systems modelling and the use of computational techniques to predict and optimise hydrological parameter assessment, anisotropic scaling, macrodispersion and solute flux measurements under unsteady, uniform/non-uniform flow conditions. The incorporated …
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Computational Fluid Dynamics (CFD) modelling of renewable energy turbine wake interactions
… thesis presents Computational Fluid Dynamics (CFD) simulations of renewable turbines akin to those used for wind, hydro, and tidal applications. The models developed took the form of actuator discs with the solution of incompressible Reynolds-Averaged Navier-Stokes equations with the k-ω SST …
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CFD modelling and validation of a large 2-stroke marine diesel engine
… processes using Computational Fluid Dynamics (CFD). However, CFD itself needs to be validated to produce reliable results. The focus of this thesis is on the CFD validation of the large 2-stroke marine diesel engine working processes. The turbulence models and the wall functions in the CFD …
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Fully coupled CEM/CFD modelling of microwave heating in a porous medium
Computational results for the microwave heating of a porous material are presented in this paper. Coupled finite difference time domain and finite volume methods are used to solve equations that describe the electromagnetic field and heat and mass transfer in porous media. These equations are …
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Conceptual evaluation of hydrogen hybrid combustion for heavy-duty engines using CFD modelling
… combustion. Computational fluid dynamics (CFD) simulations were conducted using the commercially available software Siemens Star CCM+ with the In-Cylinder add-on and a complex chemistry combustion model. Multiple pre-chamber geometries were evaluated, focusing on parameters such as the …
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CFD modelling and investigation of two-stroke dual-fuel marine engines with high pressure gas admission
… high-pressure gas direct injection, the related CFD models were customized and developed by the use of ANSYS Fluent, and validated by employing available experimental data. Subsequently, the parametric investigation of the dual fuel injection was conducted and the recommended sets of design …
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Aerodynamics Analysis of Small Horizontal Axis Wind Turbine Blades by Using 2D and 3D CFD Modelling
… simulation through Computational Fluid Dynamics (CFD) software offers inexpensive solutions to aerodynamic blade analysis problem. In this study, two-dimensional aerofoil (i.e. DU-93 and NREL-S809) CFD models are presented using ANSYS-FLUENT software. Using the Spalart-Allmaras turbulent …
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Computational fluid dynamics (CFD) modelling of critical velocity for sand transport flow regimes in multiphase pipe bends.
… (3D) computational fluid dynamics (CFD) modelling technique for the prediction of liquid-solids multiphase flow in pipes, with special emphasis on the flow in V-inclined pipe bends. The Euler-Euler (two-fluid) multiphase modelling methodology has been adopted, and the multiphase …
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Characterisation of the autoignition delay behaviour of n-heptane in the IQT combustion bomb using CFD modelling
… discrepancy, using computational fluid dynamic (CFD) techniques to explore the physical conditions prevailing in the IQT device. Specifically, CFD was used to model fuel injection into the IQT, this allowed a more accurate description of the fuel/air ratio and temperature history of the fuel …
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Experimental Investigation and CFD Modelling of a Thermosyphon-equipped Heat Exchanger used in Low-grade Waste Heat Recovery
… flow on a second pass over the thermosyphons. CFD is also used using data from the prediction model in order to obtain a visualisation of the results.<br/><br/>The results of the analytical and CFD models were found to be in good agreement with the experimental results and a recommendation is …
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CFD Modelling of the Mixture Preparation in a Modern Gasoline Direct Injection Engine and Correlations with Experimental PN Emissions
A detailed 3D CFD analysis of a modern gasoline direct injection (GDI) engine is carried out to reveal the connections between pre-combustion mixture indicators and PN emissions. Firstly, a novel calibration methodology is introduced to accurately predict the widely used characteristics of the …
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CFD Modelling of Down-Sized GDI Engines: Fuel Injection, In-Cylinder Phenomena and Correlation to Engine-Out PN Emissions
… through the development of a comprehensive 3D-CFD in-cylinder modelling tool that enables a robust and accurate insight into the pre-combustion mechanisms potentially leading to PM formation. The results presented refer to standard gasoline fuel, but remain fully relevant to synthetic …
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Validation of a CFD Approach for Gas Turbine Internal Cooling Passage Heat Transfer Prediction
… of a validated Computational Fluid Dynamics (CFD) modelling approach for internal cooling passages in rotating turbomachinery. A CFD Modelling approach and accompanying assumptions are tuned and validated against academically available experimental results for various serpentine passages. …
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