**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.

**KEYWORDS: ** INTERACTIVE, ON-LINE; MESH GENERATION; PLOTTING