25-10-2012, 04:28 PM
A 2-D Axisymmetric Model of a Stretching Jet in ALEGRA
ABSTRACT
This report presents a numerical model of a stretching copper jet, representative of a Viper shaped charge jet at 35
microsecs following detonation. A liner collapse and jet formation model is used to extract data for the jet geometry and the
axial velocity distribution. Numerical simulations are carried out using ALEGRA (Arbitrary Lagrangian Eulerian General
Research Application), and the results are compared to previously published experimental data and numerical results.
ALEGRA results at 35 microsecs are then corrected to more accurately reflect experimental observations in the new model
representing the stretching jet at the point of impact. Sensitivity studies are conducted using the stretching jet model to
determine the effects of computational mesh at later times.