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Title: Energy transfer and scale dynamics in 2D and 3D laser-driven jets

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/5.0161028· OSTI ID:1998858
 [1];  [2];  [2];  [2];  [2]
  1. Univ. of Rochester, NY (United States)
  2. Univ. of Rochester, NY (United States); Univ. of Rochester, NY (United States). Lab. for Laser Energetics

We demonstrate a methodology for diagnosing the multiscale dynamics and energy transfer in complex HED flows with realistic driving and boundary conditions. The approach separates incompressible, compressible, and baropycnal contributions to energy scale-transfer and quantifies the direction of these transfers in (generalized) wavenumber space. We use this to compare the kinetic energy (KE) transfer across scales in simulations of 2D axisymmetric vs fully 3D laser-driven plasma jets. Using the FLASH code, we model a turbulent jet ablated from an aluminum cone target in the configuration outlined. We show that, in addition to its well known bias for underestimating hydrodynamic instability growth, 2D modeling suffers from significant spurious energization of the bulk flow by a turbulent upscale cascade. In 2D, this arises as vorticity and strain from instabilities near the jet's leading edge transfer KE upscale, sustaining a coherent circulation that helps propel the axisymmetric jet farther (⁠ ≈25% by 3.5 ns) and helps keep it collimated. In 3D, the coherent circulation and upscale KE transfer are absent. Here, the methodology presented here may also help with inter-model comparison and validation, including future modeling efforts to alleviate some of the 2D hydrodynamic artifacts highlighted in this study.

Research Organization:
Univ. of Rochester, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC); SDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
SC0020229; NA0003856; NA0003914; NA0004134; AC02–05CH11231; SC0019329; CBET-2143702; SC0014318; OCE-2123496; PHY-2206380; PHY-2020249; 80NSSC18K0772
OSTI ID:
1998858
Alternate ID(s):
OSTI ID: 2008351
Journal Information:
Physics of Plasmas, Vol. 30, Issue 9; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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