NESC9910 DYNA2D.

1. NAME OR DESIGNATION OF PROGRAM:  DYNA2D

3. DESCRIPTION OF PROGRAM OR FUNCTION

DYNA2D is an explicit, two-dimensional, axisymmetric and plane strain finite element program for analyzing the large deformation dynamic and hydrodynamic response of inelastic solids. A contact-impact algorithm permits gaps and sliding with friction along material interfaces. By a specialization of this algorithm, such interfaces can be rigidly tied to admit variable zoning with no need for transition regions. Spatial discretization is achieved by the use of 4-node solid elements, and the equations-of-motion are integrated by the central  difference method. The material models implemented are: elastic, orthotropic elastic, kinematic/isotropic elastic-plastic, thermo- elastic-plastic, soil and crushable foam, linear visco-elastic, rubber, isotropic elastic-plastic, and temperature-dependent elastic-plastic. The latter two models determine only the deviatoric stresses. Pressure is determined by one of 9 equations of state.
  
This package is distributed by:
Energy Science and Technology Software Center
P.O. Box 62
1 Science.Gov Way
Oak Ridge, TN 37831
(865) 576-2606 TEL
(865) 576-6436 FAX
E-mail: ESTSC@osti.gov

4. METHOD OF SOLUTION:

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
   60,000 elements (Cray 1)
    5,000 elements (CDC7600)

6. TYPICAL RUNNING TIME

DYNA2D requires 3 CPU minutes per million mesh cycles on a CDC7600, 18-30 seconds on a Cray1, and 30-50 minutes on a DEC VAX-11/780. These timings do not account for the inclusion of sliding interfaces. The sliding interface logic is not  vectorized.

7. UNUSUAL FEATURES OF THE PROGRAM

An interactive rezoning capability eliminates the need to terminate the calculation when the mesh becomes too distorted. Rather, the mesh can be rezoned and the calculation continued.

8. RELATED AND AUXILIARY PROGRAMS

The Cray1,CDC7600 version of DYNA2D makes use of the LLNL environment PLOTLIB (NESC 9692) graphics library; the PLOTLIB software is not included. The LLNL-developed DIGLIB graphics software used with the DEC VAX11 version in included with that version.
The MAZE preprocessor (NESC 9907) can be used to generate complete input files for DYNA2D, and the ORION (NESC 9906) and TAURUS (NESC 9908) postprocessors will produce graphics output from  DYNA2D binary plot file output.
Similar methods in three dimensions are available in DYNA3D (NESC 9909).

10. REFERENCES

- DYNA2D, NIKE2D, NIKE3D, Description of "Missing" LLNL
  Environmental Subroutines for CDC,CRAY Machine Version,
  Lawrence Livermore National Laboratory Note, June 1983, Revised
  August 1987.
- T. Kennedy
  DYNA3D, TAURUS User Guide for IBM Processors,
  IBM Memorandum, August 4, 1987.
- DYNA2D, NESC No. 9910.3090, DYNA2D IBM Version Tape Description,
  National Energy Software Center Note 89-59, May 31, 1989.
- DYNA2D, NESC No. 9910.SUN, DYNA2D SUN Version Data Cartridge
  Description and Installation Information,
  National Energy Software Center Note 89-60, May 31, 1989.
- J.O. Hallisquist
  MAZE - An Input Generator for DYNA2D and NIKE2D
  UCID-19029, Rev2, June 1983.
- J.O. Hallisquist
  ORION: An Interactive Post-Processor for the Analysis Codes
  DYNA2D, and TACO2D,
  UCID-19310, January 1982.

11. MACHINE REQUIREMENTS

23,000 bytes of memory are required to execute the sample problems on a DEC VAX11/780.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED

CTSS (Cray1), LTSS (CDC7600), VMS (DEC VAX11), VM, MVS (IBM3090), UNIX BSD 4.2 (SUN).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

         J.O. Hallquist
         Lawrence Livermore National Laboratory
         P.O. Box 808
         Livermore, California 94550

3090    T. Kennedy
         IBM Corporation