A New Internal Energy Calculation for the HELP Code and Its Implications to Conical Shaped Charge Simulations

Abstract

When the HELP code is applied to conical shaped charge warhead problems, the computed internal energy predicts a thermal state completely different than that indicated by experiments. The cause of this phenomenon is the numerical interchange of the kinetic energy to internal energy which is generated by terms of the order of the truncation error in the kinetic energy calculation. A correction is given and qualitative thermal agreement is achieved, for the first time, between a HELP code simulation and experimental evidence for a conical shaped charge. Furthermore, the ad hoc usage of a predetermined upper bound on the specific internal energy in the equation of state routine for shaped charge calculations is no longer required. The effects of the modification on the pressures, velocities, specific total energies and densities are discussed.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1979
Accession Number
ADA072785

Entities

People

  • James A. Schmitt

Organizations

  • Ballistic Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Calorific Value
  • Computational Fluid Dynamics
  • Computer Simulations
  • Differential Equations
  • Energy
  • Equations
  • Explosives
  • Fluid Dynamics
  • Jet Propulsion
  • Mechanics
  • Partial Differential Equations
  • Phase Transformations
  • Physics Laboratories
  • Radial Velocity
  • Shaped Charges
  • Stagnation Point
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Explosive Engineering.
  • Fluid Dynamics.