skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Variable-density buoyancy-driven turbulence with asymmetric initial density distribution

Abstract

The effects of different initial density distributions on the evolution of buoyancy-driven homogeneous variable-density turbulence (HVDT) at low (0.05) and high (0.75) Atwood numbers are studied by using high-resolution direct numerical simulations. HVDT aims to mimic the acceleration-driven Rayleigh–Taylor and shock-driven Richtmyer–Meshkov instabilities and reveals new physics that arise from variable-density effects on the turbulent mixing. Here, the initial amounts of pure light and pure heavy flows are altered primarily to mimic the variable-density turbulence at the different locations of the Rayleigh–Taylor and Richtmyer–Meshkov instabilities’ mixing layers where the amounts of the mixing fluids are not equal. It is found that for the low Atwood number cases, the asymmetric initial density distribution has limited effects on both global and local flow evolution for HVDT. However, at high Atwood number, both global flow evolution and the local flow structures are strongly affected by the initial composition ratio. The flow composed of more light fluid reaches higher turbulent levels and the local statistics reach their fully-developed behavior earlier in the time evolution. In contrast, during the late time decay, where most of the flow is well-mixed, all parameters become independent of the initial composition ratio for both low and high Atwood numbermore » cases.« less

Authors:
 [1]; ORCiD logo [2];  [3]
  1. Lehigh Univ., Bethlehem, PA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Lehigh Univ., Bethlehem, PA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
OSTI Identifier:
1603996
Alternate Identifier(s):
OSTI ID: 1762558
Report Number(s):
LA-UR-19-27261
Journal ID: ISSN 0167-2789
Grant/Contract Number:  
89233218CNA000001; NA0003195; 1453056
Resource Type:
Accepted Manuscript
Journal Name:
Physica. D, Nonlinear Phenomena
Additional Journal Information:
Journal Volume: 406; Journal Issue: C; Journal ID: ISSN 0167-2789
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; Variable-density; Turbulence; HVDT; Direct numerical simulations

Citation Formats

Aslangil, Denis, Livescu, Daniel, and Banerjee, Arindam. Variable-density buoyancy-driven turbulence with asymmetric initial density distribution. United States: N. p., 2020. Web. https://doi.org/10.1016/j.physd.2020.132444.
Aslangil, Denis, Livescu, Daniel, & Banerjee, Arindam. Variable-density buoyancy-driven turbulence with asymmetric initial density distribution. United States. https://doi.org/10.1016/j.physd.2020.132444
Aslangil, Denis, Livescu, Daniel, and Banerjee, Arindam. Sat . "Variable-density buoyancy-driven turbulence with asymmetric initial density distribution". United States. https://doi.org/10.1016/j.physd.2020.132444. https://www.osti.gov/servlets/purl/1603996.
@article{osti_1603996,
title = {Variable-density buoyancy-driven turbulence with asymmetric initial density distribution},
author = {Aslangil, Denis and Livescu, Daniel and Banerjee, Arindam},
abstractNote = {The effects of different initial density distributions on the evolution of buoyancy-driven homogeneous variable-density turbulence (HVDT) at low (0.05) and high (0.75) Atwood numbers are studied by using high-resolution direct numerical simulations. HVDT aims to mimic the acceleration-driven Rayleigh–Taylor and shock-driven Richtmyer–Meshkov instabilities and reveals new physics that arise from variable-density effects on the turbulent mixing. Here, the initial amounts of pure light and pure heavy flows are altered primarily to mimic the variable-density turbulence at the different locations of the Rayleigh–Taylor and Richtmyer–Meshkov instabilities’ mixing layers where the amounts of the mixing fluids are not equal. It is found that for the low Atwood number cases, the asymmetric initial density distribution has limited effects on both global and local flow evolution for HVDT. However, at high Atwood number, both global flow evolution and the local flow structures are strongly affected by the initial composition ratio. The flow composed of more light fluid reaches higher turbulent levels and the local statistics reach their fully-developed behavior earlier in the time evolution. In contrast, during the late time decay, where most of the flow is well-mixed, all parameters become independent of the initial composition ratio for both low and high Atwood number cases.},
doi = {10.1016/j.physd.2020.132444},
journal = {Physica. D, Nonlinear Phenomena},
number = C,
volume = 406,
place = {United States},
year = {2020},
month = {2}
}

Journal Article:

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Homogeneous buoyancy-generated turbulence
journal, February 1992

  • Batchelor, G. K.; Canuto, V. M.; Chasnov, J. R.
  • Journal of Fluid Mechanics, Vol. 235, Issue -1
  • DOI: 10.1017/S0022112092001149

Buoyancy-driven variable-density turbulence
journal, October 2007


Variable-density mixing in buoyancy-driven turbulence
journal, May 2008


Effects of Atwood and Reynolds numbers on the evolution of buoyancy-driven homogeneous variable-density turbulence
journal, May 2020

  • Aslangil, Denis; Livescu, Daniel; Banerjee, Arindam
  • Journal of Fluid Mechanics, Vol. 895
  • DOI: 10.1017/jfm.2020.268

On the origin of low- and middler-latitude ionospheric turbulence
journal, January 2004


The Salinity, Temperature, and delta 18O of the Glacial Deep Ocean
journal, November 2002


Vertical Mixing, Energy, and the General Circulation of the Oceans
journal, January 2004


The X-ray, Optical and Radio Properties of Young Supernova Remnants
journal, May 1975


The Hydrodynamic Behavior of Supernovae Explosions
journal, January 1966

  • Colgate, Stirling A.; White, Richard H.
  • The Astrophysical Journal, Vol. 143
  • DOI: 10.1086/148549

Model-free simulations of turbulent reactive flows
journal, January 1989


Large-scale structure and entrainment in the supersonic mixing layer
journal, February 1995


Compressibility effects in modelling turbulent high speed mixing layers
journal, February 1997


Principles of inertial confinement fusion - physics of implosion and the concept of inertial fusion energy
journal, September 1996


Laser driven inertial fusion energy: present and prospective
journal, February 2004


Turbulence with Large Thermal and Compositional Density Variations
journal, January 2020


Rayleigh-Taylor instability with complex acceleration history
journal, October 2007


The Rayleigh-Taylor Instability driven by an accel-decel-accel profile
journal, November 2013

  • Ramaprabhu, P.; Karkhanis, V.; Lawrie, A. G. W.
  • Physics of Fluids, Vol. 25, Issue 11
  • DOI: 10.1063/1.4829765

Numerical investigation of initial condition effects on Rayleigh-Taylor instability with acceleration reversals
journal, November 2016


Detailed measurements of a statistically steady Rayleigh–Taylor mixing layer from small to high Atwood numbers
journal, August 2010

  • Banerjee, Arindam; Kraft, Wayne N.; Andrews, Malcolm J.
  • Journal of Fluid Mechanics, Vol. 659
  • DOI: 10.1017/S0022112010002351

Numerical simulations of two-fluid turbulent mixing at large density ratios and applications to the Rayleigh–Taylor instability
journal, November 2013

  • Livescu, D.
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 371, Issue 2003
  • DOI: 10.1098/rsta.2012.0185

Transition stages of Rayleigh–Taylor instability between miscible fluids
journal, September 2001


Development and validation of a turbulent-mix model for variable-density and compressible flows
journal, October 2010


Application of a second-moment closure model to mixing processes involving multicomponent miscible fluids
journal, January 2011


Evolution of the density self-correlation in developing Richtmyer–Meshkov turbulence
journal, October 2013

  • Tomkins, C. D.; Balakumar, B. J.; Orlicz, G.
  • Journal of Fluid Mechanics, Vol. 735
  • DOI: 10.1017/jfm.2013.430

A Two-length Scale Turbulence Model for Single-phase Multi-fluid Mixing
journal, September 2015

  • Schwarzkopf, J. D.; Livescu, D.; Baltzer, J. R.
  • Flow, Turbulence and Combustion, Vol. 96, Issue 1
  • DOI: 10.1007/s10494-015-9643-z

Two-point spectral model for variable-density homogeneous turbulence
journal, December 2018


Passive-scalar wake behind a line source in grid turbulence
journal, August 2000


Reaction analogy based forcing for incompressible scalar turbulence
journal, September 2018


Scalar Dissipation Rate Modeling and its Validation
journal, February 2009

  • Kolla, H.; Rogerson, J. W.; Chakraborty, N.
  • Combustion Science and Technology, Vol. 181, Issue 3
  • DOI: 10.1080/00102200802612419

On the alignment of strain, vorticity and scalar gradient in turbulent, buoyant, nonpremixed flames
journal, September 1998

  • Boratav, O. N.; Elghobashi, S. E.; Zhong, R.
  • Physics of Fluids, Vol. 10, Issue 9
  • DOI: 10.1063/1.869747