NESC0627 TOODY2

1. NAME OR DESIGNATION OF PROGRAM:  TOODY2

3. DESCRIPTION OF PROBLEM OR FUNCTION

TOODY2 is used to compute wave  propagation in two dimensions in rectangular or cylindrical coordinates.

4. METHOD OF SOLUTION

TOODY2 is based on the conventional finite difference analogs to the Lagrangian equations of motion. The finite difference technique is an approximate method of solving the nonlinear partial differential equations describing two-dimensional  motion. The degree of approximation depends on the mesh sizes, mesh  shape, and artificial viscosity coefficients which are used. Four types of boundary conditions are considered. These are (1) a free surface, (2) a surface with an applied stress acting on it, (3) a symmetry plane, and (4) a rigid non-sliding boundary.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:  Maximum per problem  of -, 19 different materials

6. TYPICAL RUNNING TIME

TOODY2 can calculate 3.3*10**5 mesh cycles per hour.
NEA-DB executed the test case on CDC CYBER 174 in 15 CPU seconds.

7. UNUSUAL FEATURES OF THE PROGRAM

TOODY2 features include -
(1) Intermediate tape storage is used. The values of properties  computed are written on these tapes after they have been  computed. After the computation has proceeded and these values  are again required, they are read from these tapes. This allows  values to be stored outside of the computer memory when they are     not being used in the calculations.
(2) A sliding interface option is included. This option yields a  more accurate description of the problem when the motion of two  adjacent meshes is very different. Further, this allows more  convenient zoning when more than one material is involved. Eight  sliding interfaces can be used per problem and the interface     friction can be specified as zero, infinite, or finite.

8. RELATED AND AUXILIARY PROGRAMS

TOODY2 is ALO-008 transferred from  the ALO-COSMIC collection. It is an improved version of TOODY.

10. REFERENCES:

- L.D. Bertholf and S.E. Benzley:
  TOODY-2, A Computer Program  for Two-dimensional Wave Propagation
  SC-RR-68-41 (November 1968).

11. MACHINE REQUIREMENTS

To execute the test case on CDC CYBER 174, 176,000 octal words of main storage are required.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:
SCOPE 6.2 (CDC 3600). NOS (CDC CYBER 174).

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

                 L. D. Bertholf and S. E. Benzley
                 Sandia Laboratories
                 P. O. Box 5800
                 Albuquerque, New Mexico  87115

File name	File description	Records
NESC0627_01.003	TOODY-2 INFORMATION FILE	64
NESC0627_01.004	TOODY-2 SOURCE CARD-IMAGES (FORTRAN-4)	4101
NESC0627_01.005	TOODY-2 JCL FOR TEST CASE EXECUTION	35
NESC0627_01.006	TOODY-2 INPUT DATA FOR TEST CASE	42
NESC0627_01.007	TOODY-2 OUTPUT OF TEST CASE	518