Computational Simulation of High-Speed Projectiles in Air, Water, and Sand

Abstract

The development of a comprehensive computational fluid dynamics approach for conducting simulations of projectile penetration into water-saturated sand is reported. High resolution upwind schemes suitable for a fluid dynamic system consisting of gas, liquid, and dispersed solids phases are derived and are combined with a time-derivative preconditioning strategy for efficient time integration at all flow speeds. A solids-stress model based on Mohr-Coulomb critical-state theory is used to account for compaction and deformation of sand during projectile penetration. An overset-mesh framework is also implemented in order to handle projectile relative motion in subsequent work, and improved phase interface capturing methods are also developed and tested. Results are presented for two sets of experimental data involving projectile penetration into dry sand. The computational results are sensitive to the solids-stress model and the drag coefficient predictions are generally lower than indicated in the experimental data.

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Document Details

Document Type
Technical Report
Publication Date
Dec 03, 2007
Accession Number
ADA474817

Entities

People

  • Jack R. Edwards

Organizations

  • North Carolina State University

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Coefficients
  • Computational Fluid Dynamics
  • Computational Science
  • Energy Transfer
  • Equations
  • Equations Of State
  • Experimental Data
  • Flow
  • Fluid Dynamics
  • Mach Number
  • Mechanics
  • Military Research
  • Projectiles
  • Relative Motion
  • Shear Stresses
  • Simulations
  • Three Dimensional

Readers

  • Computational Fluid Dynamics (CFD)
  • Geotechnical Engineering.
  • ballistics.