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Title: Late-time mixing and turbulent behavior in high-energy-density shear experiments at high Atwood numbers

The LANL Shear Campaign uses millimeter-scale initially solid shock tubes on the National Ignition Facility to conduct high-energy-density hydrodynamic plasma experiments, capable of reaching energy densities exceeding 100 kJ/cm 3. These shock-tube experiments have for the first time reproduced spontaneously emergent coherent structures due to shear-based fluid instabilities [i.e., Kelvin-Helmholtz (KH)], demonstrating hydrodynamic scaling over 8 orders of magnitude in time and velocity. The KH vortices, referred to as “rollers,” and the secondary instabilities, referred to as “ribs,” are used to understand the turbulent kinetic energy contained in the system. Their evolution is used to understand the transition to turbulence and that transition's dependence on initial conditions. Experimental results from these studies are well modeled by the RAGE (Radiation Adaptive Grid Eulerian) hydro-code using the Besnard-Harlow-Rauenzahn turbulent mix model. Information inferred from both the experimental data and the mix model allows us to demonstrate that the specific Turbulent Kinetic Energy (sTKE) in the layer, as calculated from the plan-view structure data, is consistent with the mixing width growth and the RAGE simulations of sTKE.
Authors:
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  1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  3. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Report Number(s):
LA-UR-18-20068
Journal ID: ISSN 1070-664X
Grant/Contract Number:
AC52-06NA25396; AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; Conference: American Physical Society Division of Plasma Physicis ; 2017-10-23 - 2017-10-27 ; Milwaukee, Wisconsin, United States; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; turbulent flows; plasma dynamics; flow instabilities; fluid flows; hydrodynamics; X-ray imaging; viscosity; medical imaging
OSTI Identifier:
1441328
Alternate Identifier(s):
OSTI ID: 1439513

Flippo, K. A., Doss, F. W., Merritt, E. C., DeVolder, B. G., Di Stefano, C. A., Bradley, P. A., Capelli, D., Cardenas, T., Desjardins, T. R., Fierro, F., Huntington, C. M., Kline, J. L., Kot, L., Kurien, S., Loomis, E. N., MacLaren, S. A., Murphy, T. J., Nagel, S. R., Perry, T. S., Randolph, R. B., Rasmus, A., and Schmidt, D. W.. Late-time mixing and turbulent behavior in high-energy-density shear experiments at high Atwood numbers. United States: N. p., Web. doi:10.1063/1.5027194.
Flippo, K. A., Doss, F. W., Merritt, E. C., DeVolder, B. G., Di Stefano, C. A., Bradley, P. A., Capelli, D., Cardenas, T., Desjardins, T. R., Fierro, F., Huntington, C. M., Kline, J. L., Kot, L., Kurien, S., Loomis, E. N., MacLaren, S. A., Murphy, T. J., Nagel, S. R., Perry, T. S., Randolph, R. B., Rasmus, A., & Schmidt, D. W.. Late-time mixing and turbulent behavior in high-energy-density shear experiments at high Atwood numbers. United States. doi:10.1063/1.5027194.
Flippo, K. A., Doss, F. W., Merritt, E. C., DeVolder, B. G., Di Stefano, C. A., Bradley, P. A., Capelli, D., Cardenas, T., Desjardins, T. R., Fierro, F., Huntington, C. M., Kline, J. L., Kot, L., Kurien, S., Loomis, E. N., MacLaren, S. A., Murphy, T. J., Nagel, S. R., Perry, T. S., Randolph, R. B., Rasmus, A., and Schmidt, D. W.. 2018. "Late-time mixing and turbulent behavior in high-energy-density shear experiments at high Atwood numbers". United States. doi:10.1063/1.5027194. https://www.osti.gov/servlets/purl/1441328.
@article{osti_1441328,
title = {Late-time mixing and turbulent behavior in high-energy-density shear experiments at high Atwood numbers},
author = {Flippo, K. A. and Doss, F. W. and Merritt, E. C. and DeVolder, B. G. and Di Stefano, C. A. and Bradley, P. A. and Capelli, D. and Cardenas, T. and Desjardins, T. R. and Fierro, F. and Huntington, C. M. and Kline, J. L. and Kot, L. and Kurien, S. and Loomis, E. N. and MacLaren, S. A. and Murphy, T. J. and Nagel, S. R. and Perry, T. S. and Randolph, R. B. and Rasmus, A. and Schmidt, D. W.},
abstractNote = {The LANL Shear Campaign uses millimeter-scale initially solid shock tubes on the National Ignition Facility to conduct high-energy-density hydrodynamic plasma experiments, capable of reaching energy densities exceeding 100 kJ/cm3. These shock-tube experiments have for the first time reproduced spontaneously emergent coherent structures due to shear-based fluid instabilities [i.e., Kelvin-Helmholtz (KH)], demonstrating hydrodynamic scaling over 8 orders of magnitude in time and velocity. The KH vortices, referred to as “rollers,” and the secondary instabilities, referred to as “ribs,” are used to understand the turbulent kinetic energy contained in the system. Their evolution is used to understand the transition to turbulence and that transition's dependence on initial conditions. Experimental results from these studies are well modeled by the RAGE (Radiation Adaptive Grid Eulerian) hydro-code using the Besnard-Harlow-Rauenzahn turbulent mix model. Information inferred from both the experimental data and the mix model allows us to demonstrate that the specific Turbulent Kinetic Energy (sTKE) in the layer, as calculated from the plan-view structure data, is consistent with the mixing width growth and the RAGE simulations of sTKE.},
doi = {10.1063/1.5027194},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {2018},
month = {5}
}