NASA Workshop on Computational Structural Mechanics 1987 · NASA Conference Q o Publication 10012...

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Transcript of NASA Workshop on Computational Structural Mechanics 1987 · NASA Conference Q o Publication 10012...

NASA Conference

Qo

Publication 10012Part 3

NASA Workshopon Computational

StructuralMechanics

1987

Nancy P. Sykes, Editor

Analytical Services and Materials, Inc.

Hampton, Virginia

Proceedings of a workshop sponsored by

the National Aeronautics and SpaceAdministration and held at

Langley Research CenterHampton, Virginia

November 18-20, 1987

(NASA-CP-100L2-Pt-3) NASA WORKSHOP ON

COMPUTATIONAL STRUCTURAL MECHANICS 1987v

PART 3 (NASA. Lanqley Research Center}

419 p CSCL20K

Hl139

February 1989

N89-29799

--THRU--

N89-ZqSI0

Unclas

0211967

NASANational Aeronautics andSpace Administration

https://ntrs.nasa.gov/search.jsp?R=19890020428 2019-08-17T13:53:08+00:00Z

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Preface

This document contains the proceedings of the NASA Workshop on ComputationalStructural Mechanics, held at NASA Langley Research Center, November 18-20, 1987.The workshop was sponsored jointly by NASA Langley Research Center and NASALewis Research Center.

The purpose of the workshop was to allow participants in Langley's and Lewis'Computational Structural Mechanics (CSM) research programs to meet and toshare research objectives and accomplishments. The intent was to encourage acooperative Langley/Lewis CSM program in which Lewis concentrates on enginestructures applications, Langley concentrates on airframe and space structuresapplications, and all participants share technology of mutual interest.

The workshop was organized into the following three sessions:

Concurrent Processing Methods and Applications

II Advanced Methods & Testbed/Simulator Development

III Computational Dynamics

Session I dealt with parallel processing methods and languages, new computerhardware, and software architecture to exploit parallel computers.

Session II dealt with the Langley CSM Testbed, the Lewis Engine StructuresComputational Simulator, and Structural Analysis Technology involving finiteelements, boundary elements, and probabilistic approaches.

Session III dealt with advanced methods for structural dynamics.

The use of trade names or names of manufacturers in this publication does notconstitute an official endorsement of such products or manufacturers, eitherexpressed or implied, by the National Aeronautics and Space Administration.

W. Jefferson Stroud

• 4

With the exception of a few adjustments madeprimarily for the purpose of uniformity, all pa-pers have been published as received.

--Editor

ii

\

CONTENTS

PREFACE ............................................................................................. i

W. Jefferson Stroud, LaRC

Part 1'

OVERVIEW OF THE NASA PROGRAM

IN COMPUTATIONAL STRUCTURAL MECHANICS ........................................... 1

Murray Hirschbein, NASA Headquarters

SESSION I - CONCURRENT PROCESSING METHODS AND APPLICATIONS

CSM PARALLEL STRUCTURAL METHODS RESEARCH ..................................... 25Olaf O. Storaasli, LaRC

COMPUTATIONAL STRUCTURAL METHODS AT NASA LEWIS ............................ 61L. J. Kiraly, LeRC

TRANSPUTER FINITE ELEMENT SOLVER .................................................... 75Albert Danial, SPARTA

TRANSPUTER PARALLEL PROCESSING AT NASA LERC ................................. 107Graham K. Ellis, ICOMP, LeRC

INNOVATIVE ARCHITECTURES

FOR DENSE MULTI-MICROPROCESSOR COMPUTERS .................................... 137Robert E. Larson, Expert-EASE

PARALLEL LINEAR EQUATION SOLVERSFOR FINITE ELEMENT COMPUTATIONS .................................................... 171

James M. Ortega, Gene Poole_ Courtenay Vaughan, Andrew Cleary,Brett Averick, U. of Virginia

ALGORITHMS AND SOFTWARE FOR SOLVING FINITE ELEMENT EQUATIONSON SERIAL AND PARALLEL ARCHITECTURES ............................................. 203

Alan George, U. of Tennessee

PARALLEL EIGENVALUE EXTRACTION ..................................................... 239

Fred A. Akl, Ohio U.

PARALLEL ALGORITHMS AND ARCHITECTURES FORCOMPUTATIONAL STRUCTURAL MECHANICS ............................................. 261

Merrell Patrick, Shing Ma, Umesh Mahajan, Duke U.

THE FORCE: A PORTABLE PARALLEL PROGRAMMING LANGUAGESUPPORTING COMPUTATIONAL STRUCTURAL MECHANICS ........................... 273

Harry F. Jordan, Muhammad S. Benten, Juergen Brehm,Aruna Ramanan, U. of Colorado

* Published under separate cover

iii

METHODS FOR DESIGN AND EVALUATION OF PARALLEL

COMPUTING SYSTEMS (THE PISCES PROJECT) ........................................... 281Terrence W. Pratt, Robert Wise, Mary Jo Haught, U. of Virginia arLd ICASE_ LaRC

MULTIPROCESSOR ARCHITECTURE: SYNTHESIS AND EVALUATICN .................. 299

Hilda M. Standley, U. of Toledo

ENVIRONMENTAL CONCEPT FOR ENGINEERING SOFTWAREON MIMD COMPUTERS ......................................................................... 323

L. A. Lopez and K. Valimohamed, U. of Illinois

HIERARCHIAL PARALLEL COMPUTER ARCHITECTUREDEFINED BY COMPUTATIONAL MULTIDISCIPLINARY MECHANICS ................... 355

Joe Padovan, Doug Gute, Keith Johnson, U. of Akron

Part 2*

SESSION H - ADVANCED METHODS & TESTBED/SIMULATOR DEVELOPMENT

CSM RESEARCH: TESTBED DEVELOPMENT ................................................ 387

Ronnie E. Gillian, LaRC

CSM TESTBED ARCHITECTURE .............................................................. 419

Philip Underwood, Lockheed PARL

COMPUTATIONAL STRUCTURAL MECHANICS

ENGINE STRUCTURES COMPUTATIONAL SIMULATOR ................................... 459

C. C. Chamis, LeRC

INTERFACING MODULES FOR INTEGRATING

DISCIPLINE SPECIFIC STRUCTURAL MECHANICS CODES ...............................487

Ned M. Endres, LeRC

CSM RESEARCH: METHODS AND APPLICATION STUDIES ...............................521

Norman F. Knight, Jr.,LaRC

GENERIC ELEMENT PROCESSOR (APPLICATION TO NONLINEAR ANALYSIS) .......571Gary Stanley,Lockheed PARL

ASSESSMENT OF SPAR ELEMENTS AND FORMULATION OF SOME BASIC 2-D AND

3-D ELEMENTS FOR USE WITH TESTBED GENERIC ELEMENT PRCCESSOR .........653

Mohammad A. Aminpour, AS&M, LaRC

DEVELOPMENT AND VERIFICATION OF LOCAL/GLOBALANALYSIS TECHNIQUES FOR LAMINATED COMPOSITES ................................683

O. Hayden Griffin,Jr.,VPI&SU

CONTROL OF THE ERRORS OF DISCRETIZATION

AND IDEALIZATION IN FINITE ELEMENT ANALYSIS .....................................733

Barna A. Szabd_ Washington U.

* Publishedunder separatecover

iv

Part 3

BOUNDARY ELEMENTS FOR STRUCTURAL ANALYSIS ................................... 763 _/

Ray Wilson, P&W

DEVELOPMENT OF AN INTEGRATED BEM FOR HOT

FLUID-STRUCTURE INTERACTION ........................................................... 831 Y=z.P. K. Banerjee and G. F. Dargush, SUNY-Buffalo

PROBABILISTIC STRUCTURAL ANALYSIS METHODS FOR SELECT SPACE

PROPULSION SYSTEM STRUCTURAL COMPONENTS ..................................... 865_5 _T. A. Cruse, SWRI

PROBABILISTIC FINITE ELEMENTS (PFEM) APPLIED

TO STRUCTURAL DYNAMICS AND FRACTURE MECHANICS ............................ 9035VWing-Kam Liu, Ted Belytschko, A. Mani, G. Besterfield, Northwestern U.

3-D INELASTIC ANALYSES FOR COMPUTATIONAL STRUCTURAL MECHANICS ..... 9432_D. A. Hopkins and C. C. Chamis, LeRC

SPECIALTY FUNCTIONS FOR SINGULARITY MECHANICS PROBLEMS ................ 981.5_Nesrin Sarigul, Ohio State U.

SESSION III- COMPUTATIONAL DYNAMICS

LARC COMPUTATIONAL STRUCTURAL DYNAMICS OVERVIEW ....................... 1013:_J. M. Housner, LaRC

ALGORITHMS AND SOFTWARE FOR NONLINEAR STRUCTURAL DYNAMICS ....... 10435BTed Belytschko, Noreen D. Gilbertsen, Mark O. Neal, Northwestern U.

CONCURRENT ALGORITHMS FOR TRANSIENT FE ANALYSIS ......................... 1067_M. Ortiz, Brown U. and B. Nour-Omid, Lockheed PARL "7

COMPUTATIONAL METHODS AND SOFTWARE SYSTEMS

FOR DYNAMICS AND CONTROL OF LARGE SPACE STRUCTURES .................... 1105__#K. C. Park, C. A. Felippa, Charbel Farhat, J. D. Downer, J. C. Chiou,W. K. Belvin, U. of Colorado

MULTI-GRID FOR STRUCTURES ANALYSIS ................................................ 113_//Albert F. Kascak, LeRC

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( OVERVIEW OF GENERAL PROPERTIES

• Parameters:

n - Number of dof in structure.

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i) Newmark's method is obtained for s - 1.

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ACCURACY ANALYSIS

• Algorithmic phase errors, 1D case:

r

• Maximum celerity of computed waves

Cma== AL/At

AL ---- subdomaln size

• For accurate results, need to take

Cmaz _> C_ OR At <_ AL/c

C_ wave celerity

1088

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( ACCURACY REQUIREMENTS

• Square mesh, s --m 2 subdomains:

AL - L/m _ O(1/v_)

At <_ AL/c- L/mc _ O(1/v_)

• Net speed-up (p - 1):

(

SPEED - UP(2D) _ O(s) x O(1/x/_) -- O(V/_)

• Cubic mesh, s = m 3 subdomains:

AL - L/m _ O(1/s 1/3)

At <_ AL/c L/mc _ O(1/s 1/3)

• Net speed-up (p - 1):

SPEED - UP(3D) _ 0(s4/3:) × O(1/s 1/3) - O(s)

1090

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( NUMERICAL TESTS

• Square membrane, simply supported, subjectedto uniform initial velocity.

• Finite deflection FE formulation. Triangular el-ements:

TA 2W _ _

2 Ao

T- tension

A0 = initial area of triangleA = deformed area.

( • Quadrilateral elements:

• Parameters: L- 2, T- 1, p- 1.

• Error measure:

ERROR = [w(t) - Wexact(t) ]2dt] 1/2t 2

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1184

1. Report No.

NASA CP-10012, Part 3

4. Title and Subtitle

NASA Workshop onMechanics- 1987

7. Author(s)

Nancy P.

Report Documentation Page

2. Government Accession No.

Computational Structural

Sykes, Editor

9. Performing Organization Name and Address

NASA Langley Research Center

Hampton, VA 23665-5225

12. Sponsoring Agency Name and Address

National Aeronautics and Space

Washington, DC 20546-0001

Administration

3. Recipient's Catalog No.

5. Report Date

February 1989

6. Performing Organization Code

8. Performing Organization Report No.

10. Work Unit No.

505-63-01-10

t11. Contract or Grant No.

13. Type of Report and Period Covered

Conference Publication

14. Sponsoring ,_gency Code

15. Supplementary Notes

Nancy P. Sykes: Analytical Services and Materials, Inc., Hampton, Virginia.

16. Abstract

This conference publication contains the proceedings of the Workshop on

Computational Structural Mechanics held at NASA Langley Research Center,

November 18-20, 1987. The workshop was sponsored jointly by NASA LangleyResearch Center and NASA Lewis Research Center.

The workshop was organized into the following three sessions:

(I) Concurrent Processing Methods and Applications

(2) Advanced Methods & Testbed/Simulator Development

(3) Computational Dynamics

17, Key Words (Suggested by Author(s))

Parallel Processing

Computational DynamicsTestbed

Computational Structural Mechanics

'19. Security Classif. (of this report)

Unclassified

r18. bistribution Statement

Unclassified - Unlimited

;Subject Category 39

20. Security C!assif. (of this page)

Unclass [ fic.d

22. price

At9

NASA FORM 1626 OC7 86 For sale by the National Tc¢:hnictd Information S¢_r,'ice, Sl.)rh=gticld , Virghda 22161-2171