Cross-code verification and sensitivity analysis to effectively model the electrothermal instability
This manuscript presents verification cases that are developed to study the electrothermal instability (ETI). Specific verification cases are included to ensure that the unit physics components necessary to model the ETI are accurate, providing a path for fluid-based codes to effectively simulate ET...
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Published in | High energy density physics Vol. 38; p. 100925 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
United States
Elsevier B.V
01.03.2021
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | This manuscript presents verification cases that are developed to study the electrothermal instability (ETI). Specific verification cases are included to ensure that the unit physics components necessary to model the ETI are accurate, providing a path for fluid-based codes to effectively simulate ETI in the linear and nonlinear growth regimes. Two software frameworks with different algorithmic approaches are compared for accuracy in their ability to simulate diffusion of a magnetic field, linear growth of the ETI, and a fully nonlinear ETI evolution. The nonlinear ETI simulations show early time agreement, with some differences emerging, as noted in the wavenumber spectrum, late into the nonlinear development of ETI. A sensitivity study explores the role of equation-of-state (EOS), vacuum density, and vacuum resistivity. EOS and vacuum resistivity are found to be the most critical factors in the modeling of nonlinear ETI development. |
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Bibliography: | USDOE Office of Science (SC), Fusion Energy Sciences (FES) SC0016515; SC0016531; NA0003881; AC02-05CH11231; AC52-07NA27344 LLNL-JRNL-812448 USDOE National Nuclear Security Administration (NNSA) |
ISSN: | 1574-1818 1878-0563 |
DOI: | 10.1016/j.hedp.2021.100925 |