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

Title: Molecular Viscosity and Diffusivity Effects in Transitional and Shock-Driven Mixing Flows

Journal Article · · Physical Review. E

Here, this paper investigates the importance of molecular viscosity and diffusivity for the prediction of transitional and shock-driven mixing flows featuring high and low Reynolds and Mach number regions. Two representative problems are computed with implicit large-eddy simulations using the inviscid Euler equations (EE) and viscous Navier-Stokes equations (NSE): the Taylor-Green vortex at Reynolds number Re = 3000 and initial Mach number Ma = 0.28, and an air- SF6 -air gas curtain subjected to two shock waves at Ma = 1.2. The primary focus is on differences between NSE and EE predictions due to viscous effects. The outcome of the paper illustrates the advantages of utilizing NSE. In contrast to the EE, where the effective viscosity decreases upon grid refinement, NSE predictions can be assessed for simulations of flows with transition to turbulence at prescribed constant Re. The NSE can achieve better agreement between solutions and reference data, and the results converge upon grid refinement. On the other hand, the EE predictions do not converge with grid refinement, and can only exhibit similarities with the NSE results at coarse grid resolutions. We also investigate the effect of viscous effects on the dynamics of the coherent and turbulent fields, as well as on the mechanisms contributing to the production and diffusion of vorticity. The results show that nominally inviscid calculations can exhibit significantly varying flow dynamics driven by changing effective resolution-dependent Reynolds number, and highlight the role of viscous processes affecting the vorticity field. These tendencies become more pronounced upon grid refinement. The discussion of the results concludes with the assessment of the computational cost of inviscid and viscous computations.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1859889
Report Number(s):
LA-UR-20-26470; TRN: US2305202
Journal Information:
Physical Review. E, Vol. 103, Issue 1; ISSN 2470-0045
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

References (73)

Modelling spherical explosions with turbulent mixing and post-detonation journal November 2012
Large Eddy Simulation of High-Reynolds-Number Free and Wall-Bounded Flows journal September 2002
T HE R ICHTMYER -M ESHKOV I NSTABILITY journal January 2002
The mixing transition in turbulent flows journal April 2000
A First Course in Turbulence January 1972
Rayleigh–Taylor and Richtmyer–Meshkov instability induced flow, turbulence, and mixing. I journal December 2017
Restoration of the contact surface in the HLL-Riemann solver journal July 1994
Effect of viscosity on Rayleigh-Taylor and Richtmyer-Meshkov instabilities journal January 1993
Rayleigh–Taylor and Richtmyer–Meshkov instability induced flow, turbulence, and mixing. II journal December 2017
TURBULENCE IN ASTROPHYSICS: Stars journal January 1998
Riemann Solvers and Numerical Methods for Fluid Dynamics book January 2009
Spontaneous Singularity in Three-Dimensional Inviscid, Incompressible Flow journal March 1980
Estimating the effective Reynolds number in implicit large-eddy simulation journal January 2014
Vorticity intensification and transition to turbulence in three-dimensional euler equations journal July 1992
Numerical Simulation of Hypersonic Shock-Induced Combustion Ramjets journal November 1998
Evolution of vortex-surface fields in viscous Taylor–Green and Kida–Pelz flows journal October 2011
On the identification of a vortex journal February 1995
Towards the Ultimate Conservative Difference Scheme journal August 1997
Unification and extension of the similarity scaling criteria and mixing transition for studying astrophysics using high energy density laboratory experiments or numerical simulations journal August 2007
Two-equation and multi-fluid turbulence models for Rayleigh–Taylor mixing journal December 2015
A procedure for the estimation of the numerical uncertainty of CFD calculations based on grid refinement studies journal April 2014
The mechanics of an organized wave in turbulent shear flow journal April 1970
Richtmyer–Meshkov instability growth: experiment, simulation and theory journal June 1999
Initial conditions and modeling for simulations of shock driven turbulent material mixing journal June 2017
An improved reconstruction method for compressible flows with low Mach number features journal May 2008
Turbulent Convection in Stellar Interiors. I. Hydrodynamic Simulation journal September 2007
The effects of plasma diffusion and viscosity on turbulent instability growth journal September 2014
Classical transport equations for burning gas-metal plasmas journal September 2014
Two classes of Richtmyer-Meshkov instabilities: A detailed statistical look journal April 2013
The influence of initial conditions on turbulent mixing due to Richtmyer–Meshkov instability journal May 2010
Effect of the numerical discretization scheme in Shock-Driven turbulent mixing simulations journal April 2020
Direct simulation of three-dimensional turbulence in the Taylor–Green vortex journal October 1991
The RAGE radiation-hydrodynamic code journal October 2008
Vortex dynamics and entrainment in rectangular free jets journal June 2001
Plasma transport in an Eulerian AMR code journal April 2017
Coarse grained simulation of convectively driven turbulent mixing, transition, and turbulence decay journal June 2020
Inhibition of turbulence in inertial-confinement-fusion hot spots by viscous dissipation journal May 2014
Variable-density mixing in turbulent jets with coflow journal July 2017
Three-dimensional simulation strategy to determine the effects of turbulent mixing on inertial-confinement-fusion capsule performance journal May 2014
Characteristic-Based Schemes for the Euler Equations journal January 1986
Three-dimensional delayed-detonation models with nucleosynthesis for Type Ia supernovae journal December 2012
Effects of operator splitting and low Mach-number correction in turbulent mixing transition simulations journal July 2019
Small-scale structure of the Taylor–Green vortex journal May 1983
Simulation of transition and turbulence decay in the Taylor–Green vortex journal January 2007
Simultaneous particle-image velocimetry–planar laser-induced fluorescence measurements of Richtmyer–Meshkov instability growth in a gas curtain with and without reshock journal December 2008
Verification and Validation exercises for the flow around the KVLCC2 tanker at model and full-scale Reynolds numbers journal January 2017
Singularities of the Euler equation and hydrodynamic stability journal June 1993
On the dynamics of multi-dimensional detonation journal February 1996
On blow-up of solution for Euler equations journal March 2001
Vortex Reconnection journal January 1994
Potential singularity mechanism for the Euler equations journal December 2016
High Explosive Detonation–Confiner Interactions journal January 2018
Multiple-time-scale modeling of turbulent flows in one-point closures journal January 1987
XLVI. Hydrokinetic solutions and observations journal November 1871
Numerical simulation of Richtmyer–Meshkov instabilities in shocked gas curtains journal January 2011
Optimization of hypersonic aircraft using genetic algorithms journal September 2014
Enthalpy diffusion in multicomponent flows journal May 2009
Self‐induced vortex ring dynamics in subsonic rectangular jets journal October 1995
Role of Initial Conditions in Establishing Asymptotic Flow Behavior journal March 2004
The Piecewise Parabolic Method (PPM) for gas-dynamical simulations journal April 1984
Instability of the interface of two gases accelerated by a shock wave journal January 1972
Challenges in Scale-Resolving Simulations of turbulent wake flows with coherent structures journal June 2018
The instability of liquid surfaces when accelerated in a direction perpendicular to their planes. I journal March 1950
Numerical Convergence Study of Nearly Incompressible, Inviscid Taylor–Green Vortex Flow journal July 2005
Application of second-moment closure to statistically steady flows of practical interest journal October 2019
XLIII. On discontinuous movements of fluids journal November 1868
3D isotropic turbulence at very high Reynolds numbers: EDQNM study journal January 2000
Taylor instability in shock acceleration of compressible fluids journal May 1960
Large-eddy simulation and multiscale modelling of a Richtmyer–Meshkov instability with reshock journal June 2006
Simulations of Richtmyer–Meshkov instabilities in planar shock-tube experiments journal March 2011
Effects of initial condition spectral content on shock-driven turbulent mixing journal July 2015
Angular dependence and growth of vorticity in the three-dimensional Euler equations journal April 1997
Investigation of the Character of the Equilibrium of an Incompressible Heavy Fluid of Variable Density journal November 1882