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Showing 1 to 20 of 27 for “"Rayleigh-Taylor instability"”.
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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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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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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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Intense spreading of radar echoes from ionospheric plasmas
… phenomena may be explained by 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 …
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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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Numerical detection of complex singularities in two and three dimensions
… fluid 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 …
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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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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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Implementation of the phase field method with the Immersed Boundary Method for application to wave energy converters
… test cases, such as droplet in shear flow, Rayleigh Taylor instability, and the Dam Break Problem is carried out. This development is then coupled with the present Immersed Boundary Module which is used to simulate the presence of moving bodies and again verified against test cases, such 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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Extreme ultraviolet probing of laser ablation
… codes POLLUX and h2d are used to study the Rayleigh-Taylor instability in a regime relevant to inertial fusion energy and, in support of experimental effort, to test the feasibility of methods for measurement of iron opacity. Simulations of EUV radiography using the POLLUX code show how the …
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Using a bistatic Fabry-Perot interferometer system to improve the estimation of thermospheric winds
… radio waves is equatorial spread F (ESF). The Rayleigh-Taylor instability (RTI) causes the development of many types of ESF events. It has been theorized that thermospheric winds have a substantial e ect on the growth rate of the RTI, but very little data has been gathered to verify or disprove …
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Towards Coupled Nonhydrostatic-Hydrostatic Hybridizable Discontinuous Galerkin Method
… several analyses. We first showcase results on Rayleigh Taylor instability-driven striations to evaluate computational savings and accuracy compared to the standard NHS HDG and finite-volume solvers. We highlight and discuss sensitivities and performance. Finally, we explore parameters that can …
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Numerical simulation of two and three-dimensional viscous free surface flows in partially-filled containers using a surface capturing approach
… the best results. The two-dimensional, viscous Rayleigh-Taylor instability is examined next. Solutions for a density ratio of two are computed for various Reynolds numbers. Computed perturbation growth rates are shown to be in good agreement with theoretical predictions. Results for the …
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Heat Transfer and Hydrodynamics of Miscible/Immiscible Systems in Microchannel Devices
… hydrodynamics of the non-isothermal immiscible Rayleigh-Taylor instability (RTI), and immiscible slug flow based microchannels have been investigated in two sub-sections. In the first sub-section, it has been shown that thermocapillary effect can have a significant effect on the evolution of the …
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Richtmyer-Meshkov instability with reshock and particle interactions
Richtmyer-Meshkov instability (RMI) occurs when an interface of two fluids with different densities is impulsively accelerated. The main interest in RMI is to understand the growth of perturbations, and numerous theoretical models have been developed and validated against experimental/numerical …
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