Verification and Validation of the FLAG Hydrocode for Impact Cratering Simulations

Caldwell, Wendy K.; Hunter, Abigail; Plesko, Catherine S.; Wirkus, Stephen

doi:10.1115/1.4042516

Verification and Validation of the FLAG Hydrocode for Impact Cratering Simulations

Journal Article · Wed Feb 13 23:00:00 EST 2019 · Journal of Verification, Validation and Uncertainty Quantification

DOI:https://doi.org/10.1115/1.4042516· OSTI ID:1503189

Caldwell, Wendy K. ^[1]; Hunter, Abigail ^[1]; Plesko, Catherine S. ^[1]; Wirkus, Stephen ^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Arizona State Univ., Glendale, AZ (United States)

Verification and validation (V&V) are necessary processes to ensure accuracy of the computational methods used to solve problems key to vast numbers of applications and industries. Simulations are essential for addressing impact cratering problems, because these problems often exceed experimental capabilities. We show that the free Lagrange (FLAG) hydrocode, developed at Los Alamos National Laboratory (Los Alamos, NM), can be used for impact cratering simulations by verifying FLAG against two analytical models of aluminum-on-aluminum impacts at different impact velocities and validating FLAG against a glass-into-water laboratory impact experiment. Our verification results show good agreement with the theoretical maximum pressures, with relative errors as low in magnitude as 1.00%. Our validation results demonstrate FLAG's ability to model various stages of impact cratering, with crater radius relative errors as low as 3.48% and crater depth relative errors as low as 0.79%. Our mesh resolution study shows that FLAG converges at resolutions low enough to reduce the required computation time from about 28 h to about 25 min. We anticipate that FLAG can be used to model larger impact cratering problems with increased accuracy and decreased computational cost on current systems relative to other hydrocodes tested by Pierazzo et al. (2008, “Validation of Numerical Codes for Impact and Explosion Cratering: Impacts on Strengthless and Metal Targets,” MAPS, 43(12), pp. 1917–1938).

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1503189

Report Number(s):: LA-UR--18-29312

Journal Information:: Journal of Verification, Validation and Uncertainty Quantification, Journal Name: Journal of Verification, Validation and Uncertainty Quantification Journal Issue: 3 Vol. 3; ISSN 2377-2158

Publisher:: ASMECopyright Statement

Country of Publication:: United States

Language:: English

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