Laser ray tracing in a parallel arbitrary Lagrangian-Eulerian adaptive mesh refinement hydrocode

Masters, N.; Kaiser, T. B.; Anderson, Robert; Eder, David C.; Fisher, Aaron; Koniges, Alice

doi:10.1088/1742-6596/244/3/032022

Cited by 6 publications

(6 citation statements)

References 6 publications

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“…New collaborations that make use of this research are being explored as well. This research resulted in six refereed publications [19][20][21][22][23][24], two invited talks at international conferences, and four additional publications in progress [25][26][27][28].…”

Section: Discussionmentioning

confidence: 99%

A Predictive Model of Fragmentation using Adaptive Mesh Refinement and a Hierarchical Material Model

Koniges¹,

Masters²,

Fisher³

et al. 2009

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Fragmentation is a fundamental material process that naturally spans spatial scales from microscopic to macroscopic. We developed a mathematical framework using an innovative combination of hierarchical material modeling (HMM) and adaptive mesh refinement (AMR) to connect the continuum to microstructural regimes. This framework has been implemented in a new multi-physics, multi-scale, 3D simulation code, NIF ALE-AMR. New multi-material volume fraction and interface reconstruction algorithms were developed for this new code, which is leading the world effort in hydrodynamic simulations that combine AMR with ALE (Arbitrary Lagrangian-Eulerian) techniques. The interface reconstruction algorithm is also used to produce fragments following material failure. In general, the material strength and failure models have history vector components that must be advected along with other properties of the mesh during remap stage of the ALE hydrodynamics. The fragmentation models are validated against an electromagnetically driven expanding ring experiment and dedicated laser-based fragmentation experiments conducted at the Jupiter Laser Facility. As part of the exit plan, the NIF ALE-AMR code was applied to a number of fragmentation problems of interest to the National Ignition Facility (NIF). One example shows the added benefit of multi-material ALE-AMR that relaxes the requirement that material boundaries must be along mesh boundaries. I. Introduction/Background Great strides have been made in numerical modeling of problems in solid mechanics in the last 20 years. For example, Lagrangian simulations of automobile crashes with millions of zones on modest computer clusters are routinely used by industry to design safer automobiles. Despite these advances, computational solid mechanics (CSM) lags in comparison to computational fluid dynamics (CFD) in many areas. While CFD simulations that are uniformly second-order accurate in both time and space are routine, and the development of higher-order-accurate algorithms is an area of intense research, multi-material Eulerian CSM simulations are still only first-order accurate at material interfaces. In addition, there are entire areas of physical phenomena in solid mechanics that are poorly understood theoretically, and reliable simulation technology is virtually nonexistent. Fragmentation, for example, occurs at a wide range of temporal and spatial scales, from atomistic to cosmological, but the underlying phenomenology is poorly understood, and the simulation technology is primitive. Fragmentation is a phenomenon that is intrinsically multi-scale; small variations in the microstructure lead to a distribution of

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Section: Discussionmentioning

confidence: 99%

A Predictive Model of Fragmentation using Adaptive Mesh Refinement and a Hierarchical Material Model

Koniges¹,

Masters²,

Fisher³

et al. 2009

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“…Необходимо также рассмотреть работу [6], описывающую алгоритм параллельной трассировки лучей для распространения лазерного излучения. Алгоритм был включен в лагранжево-эйлеров гидрокод с адаптивной сеткой.…”

Section: современный уровень развития техники трассировки лучейunclassified

“…Нужно рассматривать различные особые случаи, что приводит к расширению кода и значительному усложнению отладки. Например, в [6] такие неоднозначности устраняются путем введения стохастической процедуры, слегка возмущающей точку входа луча внутри входной грани.…”

Section: использование рациональной арифметикиunclassified

Parallel ray tracing algorithm for radiation field analysis and pinhole imaging of radiative gas

et al. 2018

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Parallel ray tracing algorithm for radiation field analysis and pinhole imaging of radiative gas An original algorithm was developed for ray tracing across unstructured 3D grid, and grid-characteristic computation of radiative energy transfer using MPI parallel technique and grid decomposition. The developed algorithm provides accounting the anisotropy of the radiation field in complex multiscale 3D magneto hydrodynamic simulations. The algorithm is implemented as a C++ code. Accurate rational calculations are applied for the intersection of rays with grid elements. Tracing of different rays within a single MPI-process is carried out in parallel with the use of OpenMP threads. Acceleration and scalability of the implemented algorithms were investigated including a comparison with other solvers within MHD code. Proposed applications are considered.

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“…37,38 The arbitrary Lagrangian-Eulerianadaptive mesh refinement (ALE-AMR) method implements an arbitrary Lagrangian-Eulerian hydrodynamics into an adaptive mesh refinement framework which offers additional resolution in regions with rapidly changing dynamics. 39 A hybrid dynamic mesh has been developed for the moving boundary problem where the quadrilateral grids are first generated near the solid bodies, the adaptive Cartesian mesh is then generated to encompass the entire computational domain, and the triangular grids are used to fill the gap between the quadrilateral grids and Cartesian mesh. 40 This mesh is generally better than the other methods mentioned above; however, it still has a mesh overlapping problem, and it is very difficult to deal with the frequent movement of energy source in additive manufacturing.…”

Section: Literature Review Of Three-dimensional Multi-scale Dynamic Mmentioning

confidence: 99%

Projection Microstereolithography as a Micro-Additive Manufacturing Technology: Processes, Materials, and Applications

Srivatsan¹,

Sudarshan²

2015

Additive Manufacturing

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Laser ray tracing in a parallel arbitrary Lagrangian-Eulerian adaptive mesh refinement hydrocode

Cited by 6 publications

References 6 publications

A Predictive Model of Fragmentation using Adaptive Mesh Refinement and a Hierarchical Material Model

A Predictive Model of Fragmentation using Adaptive Mesh Refinement and a Hierarchical Material Model

Parallel ray tracing algorithm for radiation field analysis and pinhole imaging of radiative gas

Projection Microstereolithography as a Micro-Additive Manufacturing Technology: Processes, Materials, and Applications

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