1. NAME AND TITLE

LOOM-P: A Finite Element Mesh Generation Code System with On-Line Graphic Display.

2. CONTRIBUTOR

Japan Atomic Energy Research Institute, Tokyo, Japan.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; FACOM 230/75.

4. NATURE OF PROBLEM SOLVED

LOOM-P is a two-dimensional mesh generation program which produces a best finite element mesh network for a reactor core geometry. This is an on-line automatic mesh generating program which can produce triangular mesh elements as an edit program to QMESH-RENUM.

5. METHOD OF SOLUTION

LOOM-P combines a mesh network produced by its automatic, built-in mesh generating routine with a mesh network edited out of QMESH-RENUM. It then produces a complete network for a given body like the reactor core geometry. Finally, LOOM-P rearranges the mesh data composed of triangular and rectangular finite element meshes as the input data to the three-dimensional neutron diffusion theory code FEM-BABEL. It is able to have finer mesh elements locally for any region where the neutron flux changes drastically due to a strong absorber.

6. RESTRICTIONS OR LIMITATIONS

On the FACOM 6233 A, LOOM-P is limited to 3600 words of core storage and a buffer size of 8000 words. Therefore, the numbers of mesh elements and nodes which can be displayed on the CRT at one time are about 630 and 660, respectively.

7. TYPICAL RUNNING TIME

A practical problem, such as the sample problem, runs in less than 30 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

LOOM-P is operable on the FACOM 230/75 computer. A graphic display apparatus is required.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCE

T. Ise and T. Yamazaki, "LOOM-P: A Finite Element Mesh Generation Program with On-Line Graphic Display," JAERI-M 7119 (June 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, the library data.

12. DATE OF ABSTRACT

April 1984.