Hydrodynamics

Publications

Research and Simulation of Ballistics Processes of Small Arms Ammunition Bullets

This dissertation summary details the application of computational fluid dynamics to study the complex processes of small arms ballistics. The work involves creating and validating computational models to simulate interior, exterior, and terminal ballistics, a field that heavily relies on understanding the dynamics of fluids and high-velocity impacts. This approach provides an alternative to extensive experimental testing for engineering applications like ammunition and armor design.

Grain-scale Dynamics in Explosives

J. E. Reaugh

This technical report explores the use of computational models and hydrodynamics to simulate the behavior of explosives at the grain scale. The research aims to develop a new reactive flow model that connects an explosive's microscopic, heterogeneous structure to its macroscopic performance and safety. The goal is to improve the predictive capabilities of hydrodynamics/multi-physics codes by providing a more realistic description of the ignition and initiation process.

KIVA-4 Development

David J. Torres

This paper details the development of KIVA-4, a computational fluid dynamics code used for simulating in-cylinder processes in advanced engines. The research focuses on improving the code's ability to model complex hydrodynamic phenomena, such as fuel spray dynamics and combustion, by introducing new features like parallelization and the grid overset method. These advancements aim to reduce dependence on the computational mesh and increase the accuracy of the simulations.

Modeling of the dynamics of a 40 mm gun and ammunition system during firing

N. Eches, D. Cosson, Q. Lambert, A. Langlet

This paper details a finite element model to simulate the internal dynamics of a 40 mm gun during firing, accounting for gas dynamics from propellant combustion. The model, used for parametric studies, contrasts with the hydrodynamic principles of a 120 mm hydraulic recoil system and is validated with experimental data from strain gauges on the barrel and an instrumented projectile.

Ballistic impact of a KEVLAR helmet: Experiment and simulations

C.Y. Tham , V.B.C. Tan, H.P. Lee

By integrating light-gas gun experiments with AUTODYN-3Ds hydrocode simulations, this work elucidates the impact biomechanics of a KEVLAR® helmet, achieving close agreement in deformation metrics (impression diameter, penetration depth) at 205 m/s. The validated orthotropic material model then accurately predicts V₅₀ ballistic limits against military-spec fragment and 9 mm projectiles, emphasizing the influence of stress-wave dynamics, anisotropic failure, and helmet geometry.