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Rayleigh-Taylor mixing: direct numerical simulation and ...

2017-8-10  Rayleigh-Taylor mixing, (iii) three-layer mixing and (iv) a tilted-rig Rayleigh-Taylor experiment. It is found that both approaches give similar results for the high-Reynolds number behavior. Direct numerical simulation is needed to assess the influence of finite Reynolds number. 1. Introduction Rayleigh-Taylor (RT) instability plays an ...

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Rayleigh–Taylor mixing: direct numerical simulation and ...

2016-12-6  Rayleigh–Taylor mixing: direct numerical simulation and implicit large eddy simulation David L Youngs University of Strathclyde, Glasgow G1 1XJ, United Kingdom E-mail: [email protected] Received 6 December 2016, revised 19 April 2017 Accepted for publication 15 May 2017 Published 22 June 2017 Abstract

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Rayleigh–Taylor mixing: direct numerical simulation and ...

2017-6-22  The choice of the most suitable numerical methods for 3D simulation of Rayleigh–Taylor and Richtmyer–Meshkov (RM) mixing remains an area of significant uncertainty. High-order or spectral methods are often favored for DNS, in particular for the accurate calculation of fine-scale properties, and have been used in previous the RT DNS of Cabot ...

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Rayleigh-Taylor mixing: Direct numerical simulation and ...

2017-7-1  Previous research into three-dimensional numerical simulation of self-similar mixing due to Rayleigh–Taylor instability is summarized. A range of

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Rayleigh–Taylor mixing: direct numerical simulation and ...

2017-6-22  Previous research into three-dimensional numerical simulation of self-similar mixing due to Rayleigh–Taylor instability is summarized. A range of numerical approaches has been used: direct numerical simulation, implicit large eddy simulation and large eddy simulation with an explicit model for sub-grid-scale dissipation.

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Rayleigh-Taylor mixing: direct numerical simulation and ...

2017-7-1  Previous research into three-dimensional numerical simulation of self-similar mixing due to Rayleigh-Taylor instability is summarized. A range of numerical approaches has been used: direct numerical simulation, implicit large eddy simulation and large eddy simulation with an explicit model for sub-grid-scale dissipation. However, few papers have made direct

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Rayleigh-Taylor mixing: Direct numerical simulation and ...

Previous research into three-dimensional numerical simulation of self-similar mixing due to Rayleigh-Taylor instability is summarized. A range of numerical approaches has been used: direct numerical simulation, implicit large eddy simulation and large eddy simulation with an explicit model for sub-grid-scale dissipation.

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Numerical simulation of single- and multi-mode Rayleigh ...

2022-1-1  Rayleigh–Taylor mixing: Direct numerical simulation and implicit large eddy simulation Phys. Scr. , 92 ( 2017 ) , Article 074006 CrossRef View Record in Scopus Google Scholar

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Numerical simulation of Rayleigh-Bénard convection and ...

2021-2-1  Numerical simulation of Rayleigh-Bénard convection and three-phase Rayleigh-Taylor instability using a modified MPS method. ... The proposed model is then employed to simulate three-phase Rayleigh-Taylor instability and entropy generation due to natural convection heat transfer (Differentially Heated Cavity and Rayleigh-Bénard convection). ...

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Numerical simulations of Rayleigh–Taylor and Richtmyer ...

2004-7-1  Numerical simulations of Rayleigh–Taylor instability3.1. Simulation of a small single-mode perturbation. The problem is solved numerically in a parallelepiped Π=[0, 1 2 λ x]×[0, 1 2 λ y]×[0,H]. There are two layers of incompressible, nonviscous and nonheat-conducting liquids with different densities.

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Rayleigh–Taylor turbulence: self-similar analysis and ...

Rayleigh–Taylor (RT) turbulence, due to its non-stationarity and cascade to larger scales, is expected to be different. To this end we present archival data that may be useful in assessing coarse-grained numerical procedures. Those data, typically lower-order moments, that coarse-grained simulations are expected to compute are highlighted in ...

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Numerical Simulation of Rayleigh - Taylor Instability ...

2020-8-9  Numerical Simulation of Rayleigh - Taylor Instability (Air Water-liquid): Objective: Firstly get an overall idea of what is the Rayleigh-Taylor Instability is and discuss its practical CFD models. Have to do three simulations by using a grid dependency test and give an explanation about the results. Here using

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Numerical Simulations of the Rayleigh-Taylor instability

2017-5-9  Rayleigh-Taylor instability [41]. In addition to its intrinsic importance the Reyleigh-Taylor problem has become a popular test case for numerical methods intended to study multiphase or mul- timaterial problems [21, 24, 581. For further discussion of the Rayleigh--Taylor

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Numerical Simulation of Rayleigh Taylor Instability by ...

2020-2-17  Numerical Simulation of Rayleigh–Taylor Instability 2.6. Density smoothing When the particle methods are employed to simulate the multiphase flows, a major challenge is the density discontinuity in the two-phase interface, which would result in an unsmooth pressure gradient field. This is the main reason of the interface

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Numerical Simulation of Rayleigh-Taylor Instability by ...

2017-10-24  Abstract—The Rayleigh-Taylor instability problem is one of the classic hydrodynamic instability cases in natural scenarios and industrial applications. For the numerical simulation of the Rayleigh-Taylor instability problem, this paper presents a multiphase method based on the moving particle semi-implicit (MPS) method.

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[PDF] Modeling of Rayleigh-Taylor mixing using single ...

Turbulence mixing models of different degree of complexity are investigated for Rayleigh-Taylor mixing flows with reference to high-resolution implicit large eddy simulations. The models considered, in order of increasing complexity, comprise the (i) two-equation K-L, (ii) three-equation K-L-a, (iii) four-equation K-L-a-b, and (iv) Besnard-Harlow-Rauenzahn (BHR-2).

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Numerical study on the laser ablative Rayleigh–Taylor ...

2020-4-28  The laser ablative Rayleigh–Taylor instability plays an important role in the ignition of inertial refinement fusion. An accurate simulation of this process is important to control the growth of flow instability during the implosion. In this paper, taking the simulations of the hydrodynamics, the laser energy deposition and the electronic thermal conductivity into consideration, a

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Numerical simulation of droplet formation by Rayleigh ...

Numerical simulation of droplet formation by Rayleigh-Taylor instability in multiphase corium Zanella, Raphael ... as diffusion progresses, the heavier metallic phase form at the interface. Due to the Rayleigh-Taylor instability, droplets of metallic phase grow and fall into the underneath layer with a fixed frequency. The droplet formation ...

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On the role of rarefaction/compression waves in Richtmyer ...

2019-5-3  Youngs, “ Numerical simulation of mixing by Rayleigh-Taylor and Richtmyer-Meshkov instabilities,” Laser Part. ... Youngs, “ Rayleigh–Taylor mixing: Direct numerical simulation and implicit large eddy simulation,” Phys. Scr. 92, 074006 (2017). https: ...

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Review of theoretical modelling approaches of Rayleigh ...

2010-4-13  Youngs D (2017) Rayleigh–Taylor mixing: direct numerical simulation and implicit large eddy simulation, Physica Scripta, 10.1088/1402-4896/aa732b, 92:7, (074006), Online publication date: 1-Jul-2017.

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Numerical Simulation of Rayleigh - Taylor Instability ...

2020-8-9  Numerical Simulation of Rayleigh - Taylor Instability (Air Water-liquid): Objective: Firstly get an overall idea of what is the Rayleigh-Taylor Instability is and discuss its practical CFD models. Have to do three simulations by using a grid dependency test and give an explanation about the results. Here using

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Direct Numerical Simulations of Rayleigh-Taylor ...

2012-6-13  Direct Numerical Simulations of Rayleigh-Taylor Instability with 0.04 ≤ A ≤ 0.9 Daniel Livescu, Tie Wei, CCS-2 We have concluded our high-resolution, high-Reynolds-number Direct Numerical Simulations (DNS) of the Rayleigh-Taylor instability (RTI) on the 0.5-petaflop/s, 150-k compute cores BG/L Dawn supercomputer at LLNL.

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Numerical Simulations of the Rayleigh-Taylor instability

2017-5-9  Rayleigh-Taylor instability [41]. In addition to its intrinsic importance the Reyleigh-Taylor problem has become a popular test case for numerical methods intended to study multiphase or mul- timaterial problems [21, 24, 581. For further discussion of the Rayleigh--Taylor

Get Price

Numerical Simulation of Rayleigh Taylor Instability by ...

2020-2-17  Numerical Simulation of Rayleigh–Taylor Instability 2.6. Density smoothing When the particle methods are employed to simulate the multiphase flows, a major challenge is the density discontinuity in the two-phase interface, which would result in an unsmooth pressure gradient field. This is the main reason of the interface

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Three-dimensional Numerical Simulations of Rayleigh

2012-7-10  dimensional numerical simulation of a Rayleigh-Taylor unstable carbon flame, following its evolution through the transition to turbulence. A low Mach number hydrodynamics method is used, freeing us from the harsh timestep restrictions imposed by sound waves. We fully resolve the thermal structure of the flame

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Numerical Simulation of Rayleigh-Taylor Instability by ...

2017-10-24  Abstract—The Rayleigh-Taylor instability problem is one of the classic hydrodynamic instability cases in natural scenarios and industrial applications. For the numerical simulation of the Rayleigh-Taylor instability problem, this paper presents a multiphase method based on the moving particle semi-implicit (MPS) method.

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Application of MILES to Rayleigh-Taylor and Richtmyer ...

2021-3-16  Rayleigh–Taylor mixing: direct numerical simulation and implicit large eddy simulation 22 June 2017 Physica Scripta, Vol. 92, No. 7 Impact of Computational Domain Size in Simulations of Homogeneous Decaying Turbulence and Mixing Layers

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Numerical study on the laser ablative Rayleigh–Taylor ...

2020-4-28  The laser ablative Rayleigh–Taylor instability plays an important role in the ignition of inertial refinement fusion. An accurate simulation of this process is important to control the growth of flow instability during the implosion. In this paper, taking the simulations of the hydrodynamics, the laser energy deposition and the electronic thermal conductivity into consideration, a

Get Price

Numerical simulation of droplet formation by Rayleigh ...

Numerical simulation of droplet formation by Rayleigh-Taylor instability in multiphase corium Zanella, Raphael ... as diffusion progresses, the heavier metallic phase form at the interface. Due to the Rayleigh-Taylor instability, droplets of metallic phase grow and fall into the underneath layer with a fixed frequency. The droplet formation ...

Get Price

Vortex model and simulations for Rayleigh-Taylor and ...

2004-3-30  The vortex method is applied to simulations of Rayleigh-Taylor (RT) and Richtmyer-Meshkov (RM) instabilities. The numerical results from the vortex method agree well with analytic solutions and other numerical results. The bubble velocity in the RT instability converges to a constant limit, and in the RM instability, the bubble and spike have decaying growth rates,

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