Experimental study of Rayleigh–Taylor instability: Low Atwood number liquid systems with single-mode initial perturbations

2001 ◽  
Vol 13 (5) ◽  
pp. 1263-1273 ◽  
Author(s):  
J. T. Waddell ◽  
C. E. Niederhaus ◽  
J. W. Jacobs
Keyword(s):  
Experimental Study ◽  
Single Mode ◽  
Taylor Instability ◽  
Liquid Systems ◽  
Rayleigh Taylor Instability ◽  
Atwood Number

scholarly journals Rarefaction-driven Rayleigh–Taylor instability. Part 2. Experiments and simulations in the nonlinear regime

2018 ◽  
Vol 838 ◽  
pp. 320-355 ◽  
Author(s):  
R. V. Morgan ◽  
W. H. Cabot ◽  
J. A. Greenough ◽  
J. W. Jacobs
Keyword(s):  
Rarefaction Wave ◽  
Three Dimensional ◽  
Single Mode ◽  
Taylor Instability ◽  
Nonlinear Regime ◽  
Diffuse Interface ◽  
Late Time ◽  
Two Dimensional ◽  
Rayleigh Taylor Instability ◽  
Atwood Number

Experiments and large eddy simulation (LES) were performed to study the development of the Rayleigh–Taylor instability into the saturated, nonlinear regime, produced between two gases accelerated by a rarefaction wave. Single-mode two-dimensional, and single-mode three-dimensional initial perturbations were introduced on the diffuse interface between the two gases prior to acceleration. The rarefaction wave imparts a non-constant acceleration, and a time decreasing Atwood number, $A=(\unicode[STIX]{x1D70C}_{2}-\unicode[STIX]{x1D70C}_{1})/(\unicode[STIX]{x1D70C}_{2}+\unicode[STIX]{x1D70C}_{1})$, where $\unicode[STIX]{x1D70C}_{2}$ and $\unicode[STIX]{x1D70C}_{1}$ are the densities of the heavy and light gas, respectively. Experiments and simulations are presented for initial Atwood numbers of $A=0.49$, $A=0.63$, $A=0.82$ and $A=0.94$. Nominally two-dimensional (2-D) experiments (initiated with nearly 2-D perturbations) and 2-D simulations are observed to approach an intermediate-time velocity plateau that is in disagreement with the late-time velocity obtained from the incompressible model of Goncharov (Phys. Rev. Lett., vol. 88, 2002, 134502). Reacceleration from an intermediate velocity is observed for 2-D bubbles in large wavenumber, $k=2\unicode[STIX]{x03C0}/\unicode[STIX]{x1D706}=0.247~\text{mm}^{-1}$, experiments and simulations, where $\unicode[STIX]{x1D706}$ is the wavelength of the initial perturbation. At moderate Atwood numbers, the bubble and spike velocities approach larger values than those predicted by Goncharov’s model. These late-time velocity trends are predicted well by numerical simulations using the LLNL Miranda code, and by the 2009 model of Mikaelian (Phys. Fluids., vol. 21, 2009, 024103) that extends Layzer type models to variable acceleration and density. Large Atwood number experiments show a delayed roll up, and exhibit a free-fall like behaviour. Finally, experiments initiated with three-dimensional perturbations tend to agree better with models and a simulation using the LLNL Ares code initiated with an axisymmetric rather than Cartesian symmetry.

An experimental study of small Atwood number Rayleigh-Taylor instability using the magnetic levitation of paramagnetic fluids

2012 ◽  
Vol 24 (5) ◽  
pp. 052106 ◽  
Author(s):  
Vladimer Tsiklashvili ◽  
Pedro E. Romero Colio ◽  
Oleg A. Likhachev ◽  
Jeffrey W. Jacobs
Keyword(s):  
Experimental Study ◽  
Magnetic Levitation ◽  
Taylor Instability ◽  
Rayleigh Taylor Instability ◽  
Atwood Number

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 Pure single-mode Rayleigh-Taylor instability for arbitrary Atwood numbers

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Wanhai Liu ◽  
Xiang Wang ◽  
Xingxia Liu ◽  
Changping Yu ◽  
Ming Fang ◽  
...  
Keyword(s):  
Single Mode ◽  
Taylor Instability ◽  
Rayleigh Taylor Instability
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