A Twolength Scale Turbulence Model for Singlephase Multifluid Mixing
A twolength scale, second moment turbulence model (Reynolds averaged NavierStokes, RANS) is proposed to capture a wide variety of singlephase flows, spanning from incompressible flows with single fluids and mixtures of different density fluids (variable density flows) to flows over shock waves. The twolength scale model was developed to address an inconsistency present in the singlelength scale models, e.g. the inability to match both variable density homogeneous RayleighTaylor turbulence and RayleighTaylor induced turbulence, as well as the inability to match both homogeneous shear and free shear flows. The twolength scale model focuses on separating the decay and transport length scales, as the two physical processes are generally different in inhomogeneous turbulence. This allows reasonable comparisons with statistics and spreading rates over such a wide range of turbulent flows using a common set of model coefficients. The specific canonical flows considered for calibrating the model include homogeneous shear, singlephase incompressible shear driven turbulence, variable density homogeneous RayleighTaylor turbulence, RayleighTaylor induced turbulence, and shocked isotropic turbulence. The second moment model shows to compare reasonably well with direct numerical simulations (DNS), experiments, and theory in most cases. The model was then applied to variable density shear layer and shock tube data and showsmore »
 Authors:

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 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Publication Date:
 Report Number(s):
 LAUR1427431
Journal ID: ISSN 13866184; PII: 9643
 Grant/Contract Number:
 AC5206NA25396
 Type:
 Accepted Manuscript
 Journal Name:
 Flow, Turbulence and Combustion
 Additional Journal Information:
 Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 13866184
 Publisher:
 European Research Community on Flow, Turbulence and Combustion (ERCOFTAC)
 Research Org:
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Sponsoring Org:
 USDOE
 Country of Publication:
 United States
 Language:
 English
 Subject:
 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 04 OIL SHALES AND TAR SANDS; 24 POWER TRANSMISSION AND DISTRIBUTION; Turbulence; mixing; variable density; Reynolds stress; closure model; shear flow; RayleighTaylor; RichtmyerMeshkov; direct numerical simulation; shocks; Favre average; compressible flows; density fl
 OSTI Identifier:
 1239104
Schwarzkopf, J. D., Livescu, D., Baltzer, J. R., Gore, R. A., and Ristorcelli, J. R.. A Twolength Scale Turbulence Model for Singlephase Multifluid Mixing. United States: N. p.,
Web. doi:10.1007/s104940159643z.
Schwarzkopf, J. D., Livescu, D., Baltzer, J. R., Gore, R. A., & Ristorcelli, J. R.. A Twolength Scale Turbulence Model for Singlephase Multifluid Mixing. United States. doi:10.1007/s104940159643z.
Schwarzkopf, J. D., Livescu, D., Baltzer, J. R., Gore, R. A., and Ristorcelli, J. R.. 2015.
"A Twolength Scale Turbulence Model for Singlephase Multifluid Mixing". United States.
doi:10.1007/s104940159643z. https://www.osti.gov/servlets/purl/1239104.
@article{osti_1239104,
title = {A Twolength Scale Turbulence Model for Singlephase Multifluid Mixing},
author = {Schwarzkopf, J. D. and Livescu, D. and Baltzer, J. R. and Gore, R. A. and Ristorcelli, J. R.},
abstractNote = {A twolength scale, second moment turbulence model (Reynolds averaged NavierStokes, RANS) is proposed to capture a wide variety of singlephase flows, spanning from incompressible flows with single fluids and mixtures of different density fluids (variable density flows) to flows over shock waves. The twolength scale model was developed to address an inconsistency present in the singlelength scale models, e.g. the inability to match both variable density homogeneous RayleighTaylor turbulence and RayleighTaylor induced turbulence, as well as the inability to match both homogeneous shear and free shear flows. The twolength scale model focuses on separating the decay and transport length scales, as the two physical processes are generally different in inhomogeneous turbulence. This allows reasonable comparisons with statistics and spreading rates over such a wide range of turbulent flows using a common set of model coefficients. The specific canonical flows considered for calibrating the model include homogeneous shear, singlephase incompressible shear driven turbulence, variable density homogeneous RayleighTaylor turbulence, RayleighTaylor induced turbulence, and shocked isotropic turbulence. The second moment model shows to compare reasonably well with direct numerical simulations (DNS), experiments, and theory in most cases. The model was then applied to variable density shear layer and shock tube data and shows to be in reasonable agreement with DNS and experiments. Additionally, the importance of using DNS to calibrate and assess RANS type turbulence models is highlighted.},
doi = {10.1007/s104940159643z},
journal = {Flow, Turbulence and Combustion},
number = 1,
volume = 96,
place = {United States},
year = {2015},
month = {9}
}