Primary atomization of a liquid jet in crossflow

Rana, Sandeep; Herrmann, Marcus

doi:10.1063/1.3640022

Cited by 21 publications

(32 citation statements)

References 10 publications

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“…Also, the use of a much finer Cartesian grid can be used for the level-set equation with an unstructured grid for the flow solution [24]. The level-set and the combined level-set/VOF methods have been successfully used for direct numerical simulations of the primary atomization of a jet (see for example, [26,27]). The direct numerical simulations of jets and sheets are not discussed in details in the paper.…”

Section: The Level Set Methodmentioning

confidence: 99%

“…More recently, a nonlinear break up model in conjunction with detailed computational simulations of the atomizer internal hydrodynamics have been presented [5]. Recent advancements in direct numerical simulations [26,27] provide a promising approach. Also, the developments in the maximum entropy formulations provide another promising pathway for predicting droplet size distributions in a spray [211].…”

Section: Summary and Open Issuesmentioning

confidence: 99%

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Trends in Comprehensive Modeling of Spray Formation

Tharakan

Mukhopadhyay

Datta

et al. 2013

International Journal of Spray and Combustion Dynamics

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Comprehensive modeling of spray formation in liquid fuel injectors involves modeling of (i) internal hydrodynamics of fuel injector (ii) break up of liquid sheet leading to primary and secondary atomization and (iii) prediction of size and velocity distributions of droplets in the spray. Comprehensive models addressing all the three aspects are rare though some work has been reported that incorporate two of the three aspects. However, significant volume of literature exists on the individual modules. In the present work, progress and current trends in the individual modules have been extensively reviewed and their implications on development of comprehensive models have been discussed. The unresolved issues and future research directions are also indicated.

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Section: The Level Set Methodmentioning

confidence: 99%

Section: Summary and Open Issuesmentioning

confidence: 99%

Trends in Comprehensive Modeling of Spray Formation

Tharakan

Mukhopadhyay

Datta

et al. 2013

International Journal of Spray and Combustion Dynamics

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“…Intense interfacial Rayleigh-Taylor (RT) / Richtmyer-Meshkov (RM) mixing of the fluids ensues with time 5,6 . RTI/RMI and RT/RM mixing play an important role in a broad range of processes in nature and technology, including stellar evolution and plasma fusion, and in the fossil fuel industry [7][8][9][10][11][12][13] . In this work we study the long-standing problem of RMI with variable acceleration 14 .…”

Section: Introductionmentioning

confidence: 99%

“…RMI with variable acceleration commonly occur in fluids, plasmas, and materials [7][8][9][10][11][12][13][14] : RMI leads to the appearance of light-years-long structures in clouds of molecular hydrogen, influences the formation of hot spots in inertial confinement fusion, controls combustion processes in scramjets, and drives material transformation under impact in nano-fabrication. In these vastly different physical conditions, RM flows have similar qualitative features of their evolution.…”

Section: Introductionmentioning

confidence: 99%

On the Rayleigh-Taylor unstable dynamics of three-dimensional interfacial coherent structures with time-dependent acceleration

Hill

Abarzhi

2019

AIP Advances

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Richtmyer-Meshkov instability (RMI) plays an important role in many areas of science and engineering, from supernovae and fusion to scramjets and nano-fabrication. Classical Richtmyer-Meshkov instability is induced by a steady shock and impulsive acceleration, whereas in realistic environments the acceleration is usually variable. We focus on RMI induced by acceleration with power-law time-dependence and apply group theory to solve the long-standing problem. For early-time dynamics, we find the dependence of the growth-rate on the initial conditions and show that it is independent of the acceleration parameters. For late-time dynamics, we find a continuous family of regular asymptotic solutions, including their curvature, velocity, Fourier amplitudes, and interfacial shear, and we study their stability. For each solution, the interface dynamics is directly linked to the interfacial shear, the non-equilibrium velocity field has intense fluid motion near the interface and effectively no motion in the bulk. The quasi-invariance of the fastest stable solution suggests that nonlinear coherent dynamics in RMI is characterized by two macroscopic length-scales -the wavelength and the amplitude, in agreement with observations. The properties of a number of special solutions are outlined, these being respectively, the Atwood, Taylor, convergence, minimum-shear, and critical bubbles, among others. We also elaborate new theory benchmarks for future experiments and simulations.

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“…For the purpose of achieving reliable and high-fidelity information in the spray flow field, many researchers have been dedicated to the advanced modeling techniques with high grid resolution, such as large eddy simulation (LES) and direct numerical simulation (DNS) with level set method ( Herrmann, 2010;Shinjo and Umemura, 2010;Herrmann et al, 2011;Rana and Herrmann, 2011;Xiao et al, 2013 ), level set-volume of fluid-ghost fluid approach ( Ménard et al, 2007;Lebas et al, 2009 ), and coupled NavierStokes/ghost fluid solver ( Pai et al, 2009 ). However, it should be noted that many of the numerical works have been performed on the liquid jet in a co-flowing gas stream or liquid injection into a quiescent gas, typically for diesel applications ( Iyer and Abraham, 20 03;Khosla and Crocker, 20 04;Lin et al, 2014;Navarro-Martinez, 2014;Devassy et al, 2015 ).…”

Section: Introductionmentioning

confidence: 99%