Experimental study of Rayleigh–Taylor instability with a complex initial perturbation

2009 ◽  
Vol 21 (3) ◽  
pp. 034103 ◽  
Author(s):  
D. H. Olson ◽  
J. W. Jacobs
Keyword(s):  
Experimental Study ◽  
Initial Perturbation ◽  
Taylor Instability ◽  
Rayleigh Taylor Instability

An experimental study of the Rayleigh-Taylor instability critical wave length

1992 ◽  
Vol 1 (2) ◽  
pp. 130-134
Author(s):  
Xujing Kong ◽  
Youchun Wang ◽  
Shufei Zhang ◽  
Hongkun Xu
Keyword(s):  
Experimental Study ◽  
Wave Length ◽  
Taylor Instability ◽  
Rayleigh Taylor Instability

scholarly journals The effects of forced small-wavelength, finite-bandwidth initial perturbations and miscibility on the turbulent Rayleigh–Taylor instability

2015 ◽  
Vol 787 ◽  
pp. 50-83 ◽  
Author(s):  
M. S. Roberts ◽  
J. W. Jacobs
Keyword(s):  
High Speed ◽  
Initial Perturbation ◽  
Mixing Layer ◽  
Experimental Studies ◽  
Growth Parameter ◽  
Video Camera ◽  
Taylor Instability ◽  
Layer Width ◽  
High Speed Video Camera ◽  
Rayleigh Taylor Instability

Rayleigh–Taylor instability experiments are performed using both immiscible and miscible incompressible liquid combinations having a relatively large Atwood number of $A\equiv ({\it\rho}_{2}-{\it\rho}_{1})/({\it\rho}_{2}+{\it\rho}_{1})=0.48$. The liquid-filled tank is attached to a test sled that is accelerated downwards along a vertical rail system using a system of weights and pulleys producing approximately $1g$ net acceleration. The tank is backlit and images are digitally recorded using a high-speed video camera. The experiments are either initiated with forced initial perturbations or are left unforced. The forced experiments have an initial perturbation imposed by vertically oscillating the liquid-filled tank to produce Faraday waves at the interface. The unforced experiments rely on random interfacial fluctuations, resulting from background noise, to seed the instability. The main focus of this study is to determine the effects of forced initial perturbations and the effects of miscibility on the growth parameter, ${\it\alpha}$. Measurements of the mixing-layer width, $h$, are acquired, from which ${\it\alpha}$ is determined. It is found that initial perturbations of the form used in this study do not affect measured ${\it\alpha}$ values. However, miscibility is observed to strongly affect ${\it\alpha}$, resulting in a factor of two reduction in its value, a finding not previously observed in past experiments. In addition, all measured ${\it\alpha}$ values are found to be smaller than those obtained in previous experimental studies.

Experimental Study of Rayleigh–Taylor Instability in a Shock Tube Accompanying Cavity Formation

2001 ◽  
Vol 40 (Part 1, No. 11) ◽  
pp. 6668-6674 ◽  
Author(s):  
Xiao-Liang Wang ◽  
Motoyuki Itoh ◽  
Hong-Hui Shi ◽  
Masami Kishimoto
Keyword(s):  
Experimental Study ◽  
Shock Tube ◽  
Taylor Instability ◽  
Cavity Formation ◽  
Rayleigh Taylor Instability

scholarly journals Rayleigh–Taylor turbulent mixing evolution under a shock influence

2000 ◽  
Vol 18 (2) ◽  
pp. 155-161 ◽  
Author(s):  
Yu.A. KUCHERENKO ◽  
A.P. PYLAEV ◽  
V.D. MURZAKOV ◽  
V.N. POPOV ◽  
V.E. SAVEL'EV ◽  
...  
Keyword(s):  
Experimental Study ◽  
Solid Surface ◽  
Turbulent Mixing ◽  
Initial Perturbation ◽  
Density Ratio ◽  
Internal Working ◽  
Metal Plates ◽  
Impulse Duration ◽  
Rayleigh Taylor Instability ◽  
The Impact

At the installation SOM, the experimental study of the impulse acceleration influence on the behavior of the turbulized layer obtained as a result of Rayleigh–Taylor instability (RTI) action on the system of two different density liquids with the density ratio n = 3, has been performed. After application of impulse acceleration the systems were moving according to inertia, and by using the light method the coordinates of penetration of the heavier liquid into the lighter one and vice versa were determined. The liquids studied were placed inside the ampoule that had internal working sizes (54 × 64 × 120) mm3. There were initial accidental perturbations like a rough solid surface at the interface and the width of the initial perturbation zone was L0 = 2.3 mm. The moving ampoule blow against metal plates created the impulse acceleration. The relative impulse acceleration was δg/g11 = 22.2–66.6 where g11 is the ampoule acceleration before the impact, the impulse duration was varied from 0.27 ms to 0.096 ms. The results concerned with the turbulized layer extension after the impulse acceleration action were obtained.

Experimental Study of Rayleigh-Taylor Instability in Plasma

1962 ◽  
Vol 5 (9) ◽  
pp. 1048 ◽  
Author(s):  
H. Dickinson ◽  
W. H. Bostick ◽  
J. N. DiMarco ◽  
S. Koslov
Keyword(s):  
Experimental Study ◽  
Taylor Instability ◽  
Rayleigh Taylor Instability

Simulation of the Tilted Rig Experiment

2012 ◽  
Author(s):  
Bertrand Rollin ◽  
Malcolm J. Andrews
Keyword(s):  
Initial Perturbation ◽  
Mixing Layer ◽  
Variable Density ◽  
Taylor Instability ◽  
Two Dimensional ◽  
Two Fluids ◽  
Eddy Simulation ◽  
Type Variable ◽  
Rayleigh Taylor Instability ◽  
Variable Density Turbulence

The tilted rig experiment is a derivative of the rocket rig experiment designed to study mixing of fluids by the Rayleigh-Taylor instability. In the latter experiment, a tank containing two fluids of different densities is accelerated downwards between two parallel guide rods by a rocket motor. Misalignment between density and pressure gradients trigger the instability leading turbulence and mixing of the fluids. In the tilted rig experiment, the rocket rig is inclined by few degrees off the vertical before firing, creating a slanted initial perturbation interface. The purpose of the tilted rig experiment was to help with calibration of mixing models, as it is a unique two-dimensional Rayleigh-Taylor instability flow. We reproduce conditions similar to this experiment using a Monotone Integrated Large Eddy Simulation (MILES) technique, and for the first time look at statistics of turbulence quantities that appears in “RANS-type” variable density turbulence model. Our statistics show that for the most part, the turbulence quantities in this two-dimensional Rayleigh-Taylor instability configuration behave in a similar fashion as in the planar Rayleigh-Taylor instability configuration when looking in a direction perpendicular to the mixing layer centerline.

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