1. NAME AND TITLE

DOQDP: Discrete Ordinates Quadrature Generator.

2. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

DOQDP generates direction sets (quadratures used as input to ANISN, DOT, and other related codes). If a fully symmetric quadrature is desired, DOQDP can generate the direction cosines to be used. If other than a fully symmetric quadrature is to be generated, the user must supply the appropriate direction cosines. Once the direction cosines are specified, DOQDP will generate the quadrature weights.

5. METHOD OF SOLUTION

To determine point weights, DOQDP solves a set of simultaneous liner equations by Gaussian elimination with error improvement iterations.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

An S₁₆ fully symmetric quadrature generation requires about one second on the IBM 360/91 computer.

8. COMPUTER HARDWARE REQUIREMENTS

DOQDP is operable on the IBM 360/370 computers.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCE

J. P. Jenal, P. J. Erickson, W. A. Rhoades, D. B. Simpson, and M. L. Williams, "The Generation of a Computer Library for Discrete Ordinates Quadrature Sets," ORNL/TM-6023 (September 1977).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source code and sample problem input and output.

12. DATE OF ABSTRACT

September 1977; revised and updated March 1984.