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 10 of 10 for “"Rayleigh-Bénard Convection"”.
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Active Transport in Chaotic Rayleigh-Bénard Convection
… by a spatiotemporally chaotic state of Rayleigh-Be?nard convection. A nonlinear Fischer-Kolmogorov-Petrovskii-Piskunov reaction is selected to study the transport within these flows. A highly efficient, parallel spectral element approach is employed to solve the Boussinesq and the …
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Quantifying Spatio-Temporal Chaos in Rayleigh Bénard Convection
In this project Rayleigh Bénard convection (RBC) in a cylindrical domain with experimentally realistic boundaries was investigated numerically. The results were obtained using large-scale parallel calculations. The flow field was determined as well as its linearized solutions in order to obtain …
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The Complex Spatiotemporal Dynamics of a Shallow Fluid Layer
… below to yield the chaotic dynamics of thermal convection rolls (Rayleigh–Bénard convection). Second is a free-surface fluid layer placed on a shaker to yield nonlinear surface waves (Faraday waves). In both cases the full governing partial differential equations are solved using parallel …
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A spectral method determination of the first critical Rayleigh number for a low-Prandtl number crystal melt in a cylindrical container
The onset of laminar Rayleigh-Bénard convection is investigated for a low-Prandtl number liquid metal in a cylindrical container. All surfaces are considered to be solid and no-slip. Two cases are considered for the thermal boundary conditions at the side wall: conducting and insulated surfaces. A …
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Gaining New Insights into Spatiotemporal Chaos with Numerics
… model, the Swift-Hohenberg equation, and Rayleigh-Bénard convection. The Lorenz-96 model is a continuous in time and discrete in space phenomenological model that captures important features of atmosphere dynamics. We computed the fractal dimension as a function of system size and external …
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Front Propagation and Feedback in Convective Flow Fields
… with feedback and pattern forming fronts in Rayleigh-Bénard convection. The velocity and geometry of fronts are quantified for fronts traveling through straight parallel convection rolls, spatiotemporally chaotic rolls, and weakly turbulent rolls. The front velocity is found to be dependent …
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Multiphase Flow Dynamics in Confined Domains—A DNS Study of Bubbly, Thermal and Riblet-Induced Turbulence
… configurations—liquid–liquid emulsions in Rayleigh–Bénard convection, buoyancy-driven bubbly flows in vertical channels, and channel flows over riblet-structured walls—this work advances the physical understanding of multi-physics interactions across a broad spectrum of thermofluid systems …
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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
… algorithm is validated against two test cases: Rayleigh-Bénard convection and Poiseuille-Bénard flow. Finally, design issues in rotating ribbed ducts are considered. The fully developed assumption is discussed with regard to the developing flow region, and controlling the recirculation zone in …
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Spatiotemporal Chaos in Large Systems Driven Far-From-Equilibrium: Connecting Theory with Experiment
… well developed theories exist for chaos in time. Rayleigh-B'enard convection is a paradigmatic example of spatiotemporal chaos that is also experimentally accessible. Discoveries uncovered using numerics can often be compared with experiments which can provide new physical insights. Lyapunov …
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Vizualizace proudění kryogenního helia metodou laserově indukované fluorescence
… kryogenního helia při experimentálním studiu Rayleighovy-Bénardovy konvekce, které probíhá v Ústavu přístrojové techniky (ÚPT) v Brně v laboratořích Skupiny kryogeniky a supravodivosti. Jako trasovací částice jsou uvažovány metastabilní molekuly He2*, které jsou vytvořeny ionizací helia pulzem …