J. Phys. IV France
Volume 133, June 2006
Page(s) 587 - 593
Publié en ligne 16 juin 2006
Inertial Fusion Sciences and Applications 2005
J.-C. Gauthier, et al.
J. Phys. IV France 133 (2006) 587-593

DOI: 10.1051/jp4:2006133118

Modeling NIF experimental designs with adaptive mesh refinement and Lagrangian hydrodynamics

A.E. Koniges, R.W. Anderson, P. Wang, B.T.N. Gunney, R. Becker, D.C. Eder, B.J. MacGowan and M.B. Schneider

Lawrence Livermore National Laboratory, L-561, PO Box 808, Livermore, CA 94551, USA

Incorporation of adaptive mesh refinement (AMR) into Lagrangian hydrodynamics algorithms allows for the creation of a highly powerful simulation tool effective for complex target designs with three-dimensional structure. We are developing an advanced modeling tool that includes AMR and traditional arbitrary Lagrangian-Eulerian (ALE) techniques. Our goal is the accurate prediction of vaporization, disintegration and fragmentation in National Ignition Facility (NIF) experimental target elements. Although our focus is on minimizing the generation of shrapnel in target designs and protecting the optics, the general techniques are applicable to modern advanced targets that include three-dimensional effects such as those associated with capsule fill tubes. Several essential computations in ordinary radiation hydrodynamics need to be redesigned in order to allow for AMR to work well with ALE, including algorithms associated with radiation transport. Additionally, for our goal of predicting fragmentation, we include elastic/plastic flow into our computations. We discuss the integration of these effects into a new ALE-AMR simulation code. Applications of this newly developed modeling tool as well as traditional ALE simulations in two and three dimensions are applied to NIF early-light target designs.

© EDP Sciences 2006