Performance Characteristics of HYDRA - a Multi-Physics simulation code from Lawrence Livermore National Laboratory

Langer, Steven H.; Karlin, Ian; Marinak, M. M.

doi:10.2172/1116974

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…CFDNS is a Los Alamos National Laboratory (LANL) hydrodynamic simulation code designed for direct numerical simulation of turbulent flows [13]. HYDRA is based on arbitrary Lagrangian-Eulerian (ALE) mesh used for the numerical simulation of instabilities in ICF laser-driven hohlraum [14]. Miranda is a Lawrence Livermore National Laboratory (LLNL) hydrodynamic simulation code designed for large-eddy simulation of multicomponent flows with turbulent mixing [15].…”

Section: Introductionmentioning

confidence: 99%

Validation and Verification of Turbulence Mixing due to Richtmyer-Meshkov Instability of an air/SF$_6$ interface

Kaman¹,

Holley²

2022

Preprint

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Turbulent mixing due to hydrodynamic instabilities occurs in a wide range of science and engineering applications such as supernova explosions and inertial confinement fusion. The experimental, theoretical and numerical studies help us to understand the dynamics of hydrodynamically unstable interfaces between fluids in these important problems. In this paper, we present an increasingly accurate and robust front tracking method for the numerical simulations of Richtmyer-Meshkov Instability (RMI) to estimate the growth rate. The single-mode shock tube experiments of Collins and Jacobs 2002 [1] for two incident shock strengths (M = 1.11 and M = 1.21) are used to validate the RMI simulations. The simulations based on the classical fifth order weighted essentially non-oscillatory (WENO) scheme of Jiang and Shu [2] with Yang's artificial compression [3] are compared with Collins and Jacobs 2002 shock tube experiments. We investigate the resolution effects using front tracking with WENO schemes on the two-dimensional RMI of an air/SF 6 interface. We achieve very good agreement on the early time interface displacement and amplitude growth rate between simulations and experiments for Mach number M = 1.11. A 4% discrepancy on early-time amplitude is observed between the fine grid simulation and the M = 1.21 experiments of Collins and Jacobs 2002.

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Section: Introductionmentioning

confidence: 99%

Validation and Verification of Turbulence Mixing due to Richtmyer-Meshkov Instability of an air/SF$_6$ interface

Kaman¹,

Holley²

2022

Preprint

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Thermal transport modeling of laser-irradiated spheres

Patel

Farmer

et al. 2022

Physics of Plasmas

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Thermal transport of uniformly laser-irradiated spheres of various materials is investigated computationally. One-dimensional simulations of low- to mid-Z materials (Be, Al, and Cu) are performed to evaluate the impact of nonlocal electron transport on experimental observables under laser intensities of relevance to direct-drive inertial confinement fusion. We compare thermal transport models of different levels of fidelity: flux-limited Spitzer–Harm diffusion, the Schurtz–Nicolai–Busquet (SNB) reduced-order nonlocal model, and a Fokker–Planck description. Spitzer–Harm diffusion with different flux-limiter factors are compared with different implementations of the SNB model in the HYDRA radiation hydrodynamics code. Under the conditions of interest, the peak heat flux in the thermal front with the SNB model shows good agreement with Fokker–Planck calculations, with the largest errors below 10% at 1015 W/cm2 laser intensity. From HYDRA-SNB simulations, two experimentally relevant effects are observed from nonlocal heat transport when compared to flux-limited Spitzer–Harm modeling: coronal temperatures are cooler due to reduced heat fluxes in the expanding plasma and (for mid-Z materials) x-ray emissions are enhanced due to preheating in the dense plasma.

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High spatial resolution and contrast radiography of hydrodynamic instabilities at the National Ignition Facility

Angulo

Nagel

et al. 2022

Physics of Plasmas

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We are developing techniques for studying the Rayleigh–Taylor (RT) and Richtmyer–Meshkov (RM) instabilities in a planar geometry at high-energy-densities at the National Ignition Facility (NIF). In particular, through the improvement of experimental imaging quality, we are progressing toward the study of the turbulent regime of the mixing regions in capsule implosion experiments for inertial confinement fusion, which requires few micrometers resolution. Using 60 NIF beams, a solid shock tube is driven launching a shock wave that crosses the interface between a dense and a light material pre-machined in the target to obtain sinusoidal ripples, which results in RM and RT instabilities that are imaged using the NIF Crystal Backlighter Imager. High-quality images were obtained with a mean resolution of 7 μm and improved contrast. While the obtained resolution does not allow the observation of the smallest scale of the “turbulent” energy spectrum, the generated image encompasses 63% of the total flow energy, a 50% improvement over previous studies, which is observed for the first time a roll-up feature in a high energy density-type RT experiment.

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Performance Characteristics of HYDRA - a Multi-Physics simulation code from Lawrence Livermore National Laboratory

Cited by 4 publications

References 3 publications

Validation and Verification of Turbulence Mixing due to Richtmyer-Meshkov Instability of an air/SF$_6$ interface

Validation and Verification of Turbulence Mixing due to Richtmyer-Meshkov Instability of an air/SF$_6$ interface

Thermal transport modeling of laser-irradiated spheres

High spatial resolution and contrast radiography of hydrodynamic instabilities at the National Ignition Facility

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