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Showing 1 to 20 of 50 for “"rayleigh-taylor"”.
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Rayleigh-Taylor mixing: confinement by stratification and geometry
Rayleigh-Taylor instability has been an area of active research in fluid dynamics for the last twenty years, but relatively little attention has been paid to the dynamics of problems where Rayleigh-Taylor instability plays a role, but is only one component of a more complex system. Here, …
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Stabilization of the Rayleigh-Taylor Instability With Magnetic Feedback
Made available in DSpace on 2014-12-08T22:24:45Z (GMT). No. of bitstreams: 1 7001022.pdf: 2821820 bytes, checksum: eb1554f14d3f49da61e8ab4ae7587aef (MD5) Previous issue date: 1969
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Rayleigh-Taylor-Induced electromagnetic fields in laser-produced plasmas
… to infer path-integrated field strengths. Rayleigh-Taylor (RT) growth of preimposed surface perturbations generated magnetic fields by the RT-induced Biermann battery and were measured for the first time. Good data were obtained during linear growth and when compared to ideal calculations, …
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Effect of initial conditions on the development of Rayleigh-Taylor instabilities
… is to determine if the development of a Rayleigh-Taylor (RT) mixing layer can be manipulated experimentally by altering the initial condition of the experiment. The second objective is to evaluate the performance of the Besnard, Harlow, and Rauenzahn (BHR) turbulent transport model when …
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Deceleration Stage Rayleigh-Taylor Instability Growth in Inertial Confinement Fusion Relevant Configurations
… of imploding fusion concepts have identified the Rayleigh-Taylor (RT) instability as one of the largest inhibitors to achieving fusion. Understanding the origin and development of the RT instability will allow for the development of mitigating measures to dampen the instability growth, thus …
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Reduced-dimension model for the Rayleigh-Taylor instability in a Hele-Shaw cell
… model for the density-driven hydrodynamic Rayleigh-Taylor instability. We motivate the project with experimental findings of a little-understood stabilizing effect of geometry and deviations of measured instability wavelength from theoretical predictions. We present novel methods of data …
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Rayleigh—Taylor-Instability Evolution in Colliding-Plasma-Jet Experiments with Magnetic and Viscous Stabilization
The Rayleigh—Taylor instability causes mixing in plasmas throughout the universe, from micron-scale plasmas in inertial confinement fusion implosions to parsec-scale supernova remnants. The evolution of this interchange instability in a plasma is influenced by the presence of viscosity and magnetic …
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Exploring the effects of an obstruction on the evolution of the Rayleigh-Taylor Instability
… effect of an obstruction on the evolution of the Rayleigh-Taylor instability in a confined geometry at low Atwood numbers. Laboratory experiments are the principal method of investigation, though these data are supplemented with implicit large eddy simulations (ILES). The laboratory data are …
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A study of the Rayleigh-Taylor Instability during deceleration in inertial confinement fusion relevant conditions
The Rayleigh-Taylor instability (RTI) is one of the primary hydrodynamic instabilities that acts as a disputer to achieving high yield inertial confinement fusion (ICF). The potential for RTI to grow on the interior surface of ICF capsules, caused by deceleration during the implosion, further …
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Intense spreading of radar echoes from ionospheric plasmas
… means of the E x B instability and gravitational Rayleigh-Taylor instability. A derivation of the dispersion relations for X and O mode waves transmitted from an ionosonde and an analysis of the collisional Rayleigh-Taylor instability leading to an expression for the growth rate are presented as …
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Characterisation and Measurement of Laser Produced Plasma Emission and Applications in Opacity Experiments
… to investigate the temporal evolution of the Rayleigh-Taylor instability in a laser produced plasma. A target, seeded with an initial perturbation between layers of copper and plastic exhibited Rayleigh-Taylor growth within the first 100ps of the interaction with a growth rate of 10 ± 2 ns^-1.
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Computational simulation of buoyancy-driven flows using vortex methods
… approach. Complete simulations for a variety of Rayleigh-Taylor stability problems are presented, as are preliminary results for Rayleigh-Bernard flows.
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Analysis and Modeling of Plunging Flows
… upstream of the plunge line and the turbulent Rayleigh-Taylor instability, to offer rational explanations for these two special observations.
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Turbulent convection from an area source in a confined space
… features of the dynamics of turbulent plumes, Rayleigh-Taylor convection, gravity currents and stratification processes. Initially, the dynamics of lazy plumes are investigated, \textit{i.e.} plumes formed by sources for which the Richardson number exceeds $\Gamma_0 > 1$. Particular attention …
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Numerical detection of complex singularities in two and three dimensions
… dynamics such as Kelvin-Helmholtz instability, Rayleigh-Taylor instability, and Hele-Shaw flow. In this thesis, we present a new method for the numerical analysis of complex singularities in solutions to partial differential equations. In the method, we analyze the decay of Fourier coefficients …
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Unstructured Nodal Discontinuous Galerkin Method for Convection-Diffusion Equations Applied to Neutral Fluids and Plasmas
… this DG framework. Numerical computations of Rayleigh-Taylor instability growth with experimentally relevant parameters are performed using hydrodynamic and MHD models on planar and radially converging domains. Discussions of the suppression mechanisms of Rayleigh-Taylor instabilities due to …
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Stellar and gas dynamics of interacting ring galaxies
… a proper treatment of gas dynamical processes. A Rayleigh-Taylor instability is believed to be present in the strong shock regions, which could contribute to the knotty structure observed in ring galaxies.
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The magnetospheres of accreting neutron stars
… Plasma entry when the boundary is Rayleigh-Taylor stable is examined, and, under conditions typical of bright binary X-ray sources, cusp losses and diffusion across stellar magnetic field lines are eliminated as likely ways that most of the accreting plasma might enter the …
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Shock convergence and mix dynamics in inertial confinement fusion
… propagation and of turbulent mix induced by Rayleigh-Taylor (RT) instability growth is of critical importance for ignition and high gain in inertial confinement fusion (ICF). Capsule assembly and hot-spot formation require careful timing of multiple shocks to maximize hot-spot heating while …
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Experimental Investigation of Sheared Flow Stabilization of Z-pinches
… wire array z-pinch experiments where the Rayleigh-Taylor instability was suppressed showed increased x-ray yield and power [1]; however the pressure driven MHD instabilities (sausage and kink instabilities) were still present and possibly limited the x-ray production of the pinch. Linear …
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