Verification and validation of the flag hydrocode for impact cratering simulations

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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. Here, 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).

Original languageEnglish (US)
Article number031004
JournalJournal of Verification, Validation and Uncertainty Quantification
Volume3
Issue number3
DOIs
StatePublished - Sep 1 2018

Fingerprint

Verification and Validation
Lagrange
Aluminum
Simulation
Relative Error
Computational methods
Explosions
Analytical models
Glass
Metals
Costs
Water
Industry
Experiments
Explosion
Computational Methods
Analytical Model
Computational Cost
Exceed
Radius

ASJC Scopus subject areas

  • Computational Theory and Mathematics
  • Computer Science Applications
  • Modeling and Simulation
  • Statistics and Probability

Cite this

Verification and validation of the flag hydrocode for impact cratering simulations. / Caldwell, Wendy K.; Hunter, Abigail; Plesko, Catherine S.; Wirkus, Stephen.

In: Journal of Verification, Validation and Uncertainty Quantification, Vol. 3, No. 3, 031004, 01.09.2018.

Research output: Contribution to journalArticle

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