Computer Programs

NEA-0565 MAILLE.

NEA-0565 MAILLE.

MAILLE, Triangular Finite Elements Generator for Planar Structure

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, FEATURES, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: MAILLE.

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2. COMPUTERS

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Program name	Package id	Status	Status date
MAILLE	NEA-0565/01	Tested	01-OCT-1979

Machines used:

Package ID	Orig. computer	Test computer
NEA-0565/01	CDC 7600	CDC 7600

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3. NATURE OF PHYSICAL PROBLEM SOLVED

Generates automatically triangular finite elements for planar structures.

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4. METHOD OF SOLUTION

The finite elements can be both simple triangles with 3 nodes and 3 vertices or isoparametric triangles defining 6 nodes. The structure is entered into the program as blocks of rectangles on the sides of which the nodes are defined. The sides may be straight lines or curves. The program generates at the interior of each block automatically the meshes. The nodes are then renumbered in order to generate a minimal band width. A CALCOMP plotter can be used to plot the finite elements of the structure with the renumbered nodes. Card output on which the coordinates of the nodes and the definition of the triangles are punched is provided for further processing in thermoelasticity problems.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Fixed dimensions are used which permit the user to treat cases with up to 167 sides, 63 blocks. The maximum number of meshes on each side excluding the medium is 20. The maximum total number of nodes on the sides, medium excluded is 350.

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6. TYPICAL RUNNING TIME

6 seconds CPU for test problem: 347 nodes, 7 blocks and 41 seconds of I/O on CDC7600.

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7. UNUSUAL FEATURES: UNUSUAL FEATURES OF THE PROGRAM

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8. RELATED AND AUXILIARY PROGRAMS: SIGMA-RZ, TEMP

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9. STATUS

Package ID	Status date	Status
NEA-0565/01	01-OCT-1979	Tested at NEADB

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10. REFERENCES

- MM. Deries, M. Pria:
programme MAILLE, description generale
FRANLAB (1974) (in French).

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11. MACHINE REQUIREMENTS: 113000b octal words SCM., 320000b octal words LCM.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0565/01	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: SCOPE 2.1.

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14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

An IBM version in single precision was generated which gave a band width of 33 whereas the CDC version gave a band width of 17 for the same problem. A double precision version would require 1 megabyte core storage on IBM (LCM is simulated in fast memory).

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15. NAME AND ESTABLISHMENT OF AUTHOR

    MM. Deries, M. Pria
    FRANLAB Informatique
    4 Av. de Bois-Preau
    92 Rueil Malmaison
    France

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16. MATERIAL AVAILABLE

NEA-0565/01

File name	File description	Records
NEA0565_01.001	SOURCE (F4,EBCDIC)	1632
NEA0565_01.002	SUBROUTINE INTEGR,MCARRE (F4)	305
NEA0565_01.003	DUMMY PLOT ROUTINE	9
NEA0565_01.004	SAMPLE PROBLEM INPUT	78
NEA0565_01.005	SAMPLE PROBLEM PUNCHED OUTPUT	191
NEA0565_01.006	SAMPLE PROBLEM PRINTED OUTPUT	364
NEA0565_01.007	JCL AND INFORMATION	23

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17. CATEGORIES

I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: bandwidth minimization, finite element method, mesh generation.