LS-DYNA

LS-DYNA originates from the DYNA3D program, developed by Dr. John O. Hallquist at the Lawrence Livermore National Laboratory in 1976. ^[1] The program was designed to simulate the impact of a shock wave of a variable-power nuclear bomb dropped from a small heights, the development of which the Laboratory was engaged in at that time. ^[2] At that time, there were no three-dimensional modeling programs for simulating impact effects, and two-dimensional modeling (HEMP and HONDO programs) gave insufficiently accurate results. Although the variable-power bomb project was canceled, the development of the DYNA3D program continued. At the same time, a two-dimensional version of the program called DYNA2D was developed.

The first version of the program was released in August 1976. The program was written in Fortran for the CDC 7600 supercomputer, and in 1979 the program was adapted for the Cray-1 supercomputer, which entered the Livermore lab, where it ran 10 times faster thanks to deep code vectorization and the Cray-1 vector supercomputer. Since 1978, the program has been handed over for free general use along with all libraries of materials, including models of explosives. The public version was not specifically vectorized. The first source code was transferred to France at her request, and then to Japan and other European countries, such as the UK, where Rolls-Royce used it to design jet engines.

For several years from 1976 to 1984, John Halkwist was the sole developer of the program. In 1984, David J. Benson joined him and in 1986 they released a new version of the program that was compatible with the operating systems VAX / VMS , COS and others. In 1987, David Benson left the Laboratory, but continued to advise Holkvist.

In 1989, at the initiative of the US Department of Energy, Livermore Software Technology Corporation (LSTC) was founded with the aim of transferring government experience to industry to continue the development of the DYNA3D program as a commercial version called LS-DYNA3D. This name was later abbreviated to LS-DYNA. Holkvist left the Laboratory and became president of LSTC. After the departure of Holkvist, the Laboratory stopped distributing new versions of DYNA3D for free.

The program is designed to solve three-dimensional dynamic nonlinear problems of the mechanics of a deformable solid , fluid and gas mechanics , heat transfer, as well as related problems. LS-DYNA is widely used in such fields of science and technology as automobile manufacturing (simulation of crash tests ), military-industrial complex (simulation of explosions of ammunition and their impact on surrounding objects), aircraft and rocket science (design of jet engines and nozzles) and etc.

LS-DYNA implements an explicit and implicit finite element method with the possibility of constructing a Lagrangian , Euler, and hybrid mesh, multicomponent hydrodynamics, a meshless method of smooth particles , a meshless method based on the Galerkin method . The program has built-in procedures for automatic tuning and smoothing of the finite element mesh during element degeneration, highly efficient algorithms for solving contact problems, a wide range of material models, and user programming capabilities.

Since 1996, the LS-DYNA solver has been integrated into the ANSYS software package, where it is used to solve dynamic analysis problems. In 2006, the LS-DYNA solver was also included in the MD NASTRAN software package, and it is also supported by the MEDINA program.

Material Library

Library of material models presented in LS-DYNA:

• Metal
• Plastic
• Glass
• Foam
• the cloth
• Elastomer
• Honeycomb structures
• Concrete
• Priming
• Viscous liquids
• Custom materials

1. ↑ LSTC. LS-DYNA Keyword User's Manual, Volume 1 (unspecified) . Livermore Software Technology Corporation (LSTC).
2. ↑ Dr. David J. Benson. The History of LS-DYNA (neopr.) . University Of California, San Diego. Archived May 12, 2013.

• Official LSTC Company Page
• User Guide and LS-DYNA Examples