**1. NAME AND TITLE**

INGEN: A General-Purpose Mesh Generator for Finite Element Codes.

**2. CONTRIBUTOR**

Los Alamos National Laboratory, Los Alamos, New Mexico.

**3. CODING LANGUAGE AND COMPUTER**

Fortran IV; CDC 7600 (P00207C000000).

**4. NATURE OF PROBLEM SOLVED**

INGEN is a general-purpose mesh generator for use in conjunction with two and three dimensional finite element programs. The basic components of INGEN are surface and three-dimensional region generators that use linear-blending interpolation formulae. These generators are based on an i, j, k index scheme, which is used to number nodal points, construct elements, and develop displacement and traction boundary conditions.

**5. METHOD OF SOLUTION**

The user of INGEN develops a mesh grading by first generating the boundary edges of the mesh with the desired spacing of nodal points using the line and circular-arc generators and then using surface and volume (three-dimensional region) generators, both of which preserve this spacing. The surface nodal-point generator preserves this spacing by using the nodal points as they are distributed along the boundary edges as the criteria for spacing the surface nodal points. Similarly, the volume nodal-point generator calculates the interior nodal points, using the surface nodal points as the criteria for spacing the interior nodal points. Both the surface and volume generators use linear-blending interpolation equations for calculating nodal point coordinates.

**6. RESTRICTIONS OR LIMITATIONS**

None noted.

**7. TYPICAL RUNNING TIME**

The sample problem ran in .07 minutes on the CDC 7600 computer.

**8. COMPUTER HARDWARE REQUIREMENTS**

INGEN is operable on the CDC 7600 computer.

**9. COMPUTER SOFTWARE REQUIREMENTS**

A Fortran IV compiler is required. INGEN was developed under SCOPE 2.15.

**10. REFERENCE**

**A) Included in document:**

W. A. Cook, "A General-Purpose Mesh Generator for Finite-Element Codes," LA-9402-MS (June 1982).

Data Output on Microfiche on inside back cover.

** B) Background Information:**

K.J. Bathe, E.L. Wilson, and R.H. Iding, "NONSAP: A Structural Analysis Program for Static and Dynamic Response of Nonlinear Systems," UC-SESM-74-3 (February 1974).

K.J. Bathe, "ADINA, A Finite Element Program for Automatic Dynamic Incremental Nonlinear Analysis," Massachusetts Institute of Technology report 82448-1 (September 1975, revised May 1977).

**11. CONTENTS OF CODE PACKAGE**

Included are the referenced document and one (1.44MB) DOS diskette which contains the source code and sample problem input.

**12. DATE OF ABSTRACT**

March 1984, July 1991, November 1999.

**KEYWORD: ** MESH GENERATION