NESC9564 AYER.

1. NAME OR DESIGNATION OF PROGRAM:  AYER.

3. DESCRIPTION OF PROGRAM OR FUNCTION

AYER is a finite element program which implicitly solves the general two-dimensional equation of thermal conduction for plane or axisymmetric bodies. AYER takes into account the effects of time (transient problems), in-plane anisotropic thermal conductivity, a three-dimensional velocity distribution, and interface thermal contact resistance. Geometry and material distributions are arbitrary, and input is via subroutines provided by the user. As a result, boundary conditions, material properties, velocity distributions, and internal power generation may be made functions of, e.g. time, temperature, location, and heat flux.

4. METHOD OF SOLUTION

The finite element method is used with the assumption of a linear temperature distribution in each basic triangular element.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maxima of -
       1000 nodes
         50 materials
         50 boundaries
          6 sides/element
The nodes, materials, and boundaries maxima are set in DIMENSION statements and can be adjusted.

6. TYPICAL RUNNING TIME:

NEA-DB ran the test case on an IBM PC/AT microcomputer  in about one minute.

7. UNUSUAL FEATURES OF THE PROGRAM

Because geometry input is arbitrary, AYER is compatible with any finite element stress program. Because the input is mainly in the form of subroutines supplied by the user, the complexity of the input is directly related to the complexity of the problem.

8. RELATED AND AUXILIARY PROGRAMS

The AYER code was developed originally for mainframe CDC systems.

10. REFERENCES

- Frank P. Incropera and David P. DeWitt:
   "Chapter 4. Two-Dimensional Steady-State Conduction,"
   Introduction to Heat Transfer
   John Wiley & Sons, New York, pp. 155-165, 1985.

- R.G. Lawton :
  The AYER Heat Conduction Computer Program
  UC-32 (May 1974)
- M. Birgersson :
  AYER FDC Description and Recommended Equipment List
  NESC Note 88-50 (February 29, 1988)
- AYER Equipment List

11. MACHINE REQUIREMENTS

IBM PC/AT with 1-1.2 Mbyte flexible disk drive and 256 Kbytes memory; Intel 80287 math coprocessor; core AT plus 30 or larger fixed disk; AST Advantage board or equivalent multifunction board with at least 384 Kbytes memory; Hercules, or compatible, graphics board; Princeton MAX-12 (amber) or equivalent monitor; Maynard Maynstream 60 or equivalent fixed disk backup system; IBM Proprinter or IBM-compatible Centronics interface graphics printer; VTERM 4010 terminal emulator.

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  DOS 3.1; DOS 3.2.

MSDOS V 3.21 with Compiler Microsoft FORTRAN77 V 3.1

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

Recommended optional hardware and software includes the following: Kensington Microware Masterpiece power center for all peripherals (surge protection), Microsoft mouse, an additional 360 Kbyte flexible disk drive, and both the Professional FORTRAN Scientific Subroutine Library and 50 more Professional FORTRAN Scientific Subroutines from Wiley Professional Software.
The executable module included in the package is not compatible with IBM PS/2 computers and may not be suitable for use with other non-AT computers.

15. NAME AND ESTABLISHMENT OF AUTHORS

     G.A. Bennett and R.G. Lawton
     Los Alamos National Laboratory

File name	File description	Records
NESC9564_01.001	Information file	56
NESC9564_01.002	PCAYER source program (FORTRAN)	715
NESC9564_01.003	144-element sample program (FORTRAN)	127
NESC9564_01.004	PCAYER executable program	916
NESC9564_01.005	Test case input data	315
NESC9564_01.006	Test case printed output	440
NESC9564_01.007	DOS file-names	6