Title: Coupling laser physics to radiation-hydrodynamics

Abstract

In order to accurately model implosion hydrodynamics in a radiation-hydrodynamics code, it is essential to include accurate accounting for energy deposition physics. In inertial confinement fusion (ICF), where capsules are driven by lasers or laser-driven x-rays, energy deposition profiles and energy transport have a strong impact on the development and evolution of capsule dynamics and hydrodynamic instabilities. Nevertheless, accurately modeling laser beam propagation in radiation-hydrodynamics codes presents unique challenges associated with disparate resolution requirements, the potential to seed spurious noise in highly unstable systems, and computational expense. We discuss a new method for coupling laser ray-tracing physics to a radiation hydrodynamics code, developed in the process of implementing the Mazinisin laser ray-trace into the xRAGE radiation hydrodynamics code. In contrast to previous approaches, in which laser ray-tracing is performed on the radiation-hydrodynamics mesh, our method involves a mesh generation and evolution strategy that addresses the unique requirements of the laser ray-trace in a separate mesh, enabling performance enhancements and strategies to reduce noise seeded by the discretization of beams into computational rays. In addition, we have employed several methods to ensure that spurious mesh imprinting is minimized. These involved optimizing the laser and radiation-hydrodynamics meshes as well as interpolation betweenmore » them and requires the use of an exact initialization method for the radiation-hydrodynamics mesh. Furthermore, these techniques have enabled efficient computation of laser-driven implosions and other experiments with minimal introduction of spurious noise.« less

Authors:

Haines, Brian M.  ^[1];

• Search DOE PAGES for author "Haines, Brian M."
• Search DOE PAGES for ORCID "0000-0002-3889-7074"

Keller, D. E. ^[2]; Marozas, J. A. ^[2]; McKenty, P. W. ^[2]; Anderson, K. S. ^[2]; Collins, T. J. B. ^[2]; Dai, W. W. ^[1]; Hall, Michael L.  ^[1];

• Search DOE PAGES for author "Hall, Michael L."
• Search DOE PAGES for ORCID "0000-0002-7186-5912"

Jones, Samuel  ^[1];

• Search DOE PAGES for author "Jones, Samuel"
• Search DOE PAGES for ORCID "0000-0003-3970-1843"

McKay, Jr, Michael Darrell ^[1]; Rauenzahn, Rick M.  ^[1];

• Search DOE PAGES for author "Rauenzahn, Rick M."
• Search DOE PAGES for ORCID "0000-0002-3149-6008"

Woods, Douglas Nelson  ^[1]

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• Search DOE PAGES for ORCID "0000-0003-4683-4791"

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+ Show Author Affiliations

1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. Univ. of Rochester, NY (United States)

Publication Date:

Wed Feb 26 00:00:00 EST 2020

Research Org.:

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1604052

Alternate Identifier(s):

OSTI ID: 1603696

Report Number(s):

LA-UR-19-32583
Journal ID: ISSN 0045-7930

Grant/Contract Number:  

89233218CNA000001; AC52-06NA25396; NA0001944

Resource Type:

Accepted Manuscript

Journal Name:

Computers and Fluids

Additional Journal Information:

Journal Volume: 201; Journal Issue: C; Journal ID: ISSN 0045-7930

Publisher:

Elsevier

Country of Publication:

United States

Language:

English

Subject:

47 OTHER INSTRUMENTATION; Laser ray-trace; Radiation-hydrodynamics; Mesh generation