COMET-AR User's Manual - Department Of Computer Science

895 Pages·1998·1.92 MB·English

NASA/CR-97-206284
COMET-AR User(cid:213)s Manual
COmputational MEchanics Testbed With Adaptive Refinement
E. Moas, Editor
Applied Research Associates, Inc., Raleigh, North Carolina
December 1997
The NASA STI Program Office ... in Profile

Since its founding, NASA has been dedicated • CONFERENCE PUBLICATION.
to the advancement of aeronautics and space Collected papers from scientific and
science. The NASA Scientific and Technical technical conferences, symposia,
Information (STI) Program Office plays a key seminars, or other meetings sponsored or
part in helping NASA maintain this co-sponsored by NASA.
important role.
• SPECIAL PUBLICATION. Scientific,
The NASA STI Program Office is operated by technical, or historical information from
Langley Research Center, the lead center for NASA programs, projects, and missions,
NASA(cid:213)s scientific and technical information. often concerned with subjects having
The NASA STI Program Office provides substantial public interest.
access to the NASA STI Database, the
largest collection of aeronautical and space • TECHNICAL TRANSLATION. English-
science STI in the world. The Program Office language translations of foreign scientific
is also NASA(cid:213)s institutional mechanism for and technical material pertinent to
disseminating the results of its research and NASA(cid:213)s mission.
development activities. These results are
published by NASA in the NASA STI Report Specialized services that help round out the
Series, which includes the following report STI Program Office(cid:213)s diverse offerings include
types: creating custom thesauri, building customized

databases, organizing and publishing
• TECHNICAL PUBLICATION. Reports of research results ... even providing videos.
completed research or a major significant
phase of research that present the results For more information about the NASA STI
of NASA programs and include extensive Program Office, see the following:
data or theoretical analysis. Includes
compilations of significant scientific and • Access the NASA STI Program Home
technical data and information deemed Page at http://www.sti.nasa.gov
to be of continuing reference value. NASA
counter-part of peer reviewed formal • E-mail your question via the Internet to
professional papers, but having less [email protected]
stringent limitations on manuscript
length and extent of graphic • Fax your question to the NASA Access
presentations. Help Desk at [phone]

• TECHNICAL MEMORANDUM. • Phone the NASA Access Help Desk at
Scientific and technical findings that are [phone]
preliminary or of specialized interest,
e.g., quick release reports, working • Write to:
papers, and bibliographies that contain NASA Access Help Desk
minimal annotation. Does not contain NASA Center for AeroSpace Information
extensive analysis. 800 Elkridge Landing Road

Linthicum Heights, MD 21090-2934
• CONTRACTOR REPORT. Scientific and
technical findings by NASA-sponsored
contractors and grantees.
NASA/CR-97-206284
COMET-AR User(cid:213)s Manual
COmputational MEchanics Testbed With Adaptive Refinement
E. Moas, Editor
Applied Research Associates, Inc., Raleigh, North Carolina
National Aeronautics and
Space Administration
Langley Research Center Prepared for Langley Research Center
Hampton, Virginia 23681-2199 under Purchase Order L-44830D
December 1997
Available from the following:
NASA Center for AeroSpace Information (CASI) National Technical Information Service (NTIS)
800 Elkridge Landing Road 5285 Port Royal Road
Linthicum Heights, MD 21090-2934 Springfield, VA 22161-2171
[phone] [phone]
Preface
The COMET-AR User’s Manual provides a reference manual for the COmputational MEchanics
Testbed with Adaptive Refinement (COMET-AR), a software system developed jointly by
Lockheed Palo Alto Research Laboratory and NASA Langley Research Center under contract
NAS1-18444. The COMET-AR system is an extended version of an earlier software system called
COMET (also developed by Lockheed and NASA). The primary extensions are the adaptive mesh
refinement capabilities and a new “object-like” database interface that makes COMET-AR easier
to extend further.
This User’s Manual provides a detailed description of the user interface to COMET-AR from the
viewpoint of a structural analyst. For a more concise treatment of the user interface which includes
walk-through examples, see the COMET-AR Tutorial. For additional details on Adaptive
Refinement (AR) theory and applications, please see the NASA Contractor Report entitled
Adaptive Refinement for Shell Structures. For information on how to extend COMET-AR in the
direction of adding new elements, new constitutive models or new data objects, consult the
developer-oriented sections of the Generic Element Processor Manual, the Generic Constitutive
Processor Manual, and the High-level DataBase (HDB) Manual. (See section on “Related
COMET-AR Documentation” in Chapter 1 for a list of such references.)
The contents of this document were originally compiled in October 1993 by Gary Stanley of
Lockheed Palo Alto Research Laboratory. Contributors include:
Contributor Affiliation Phone Number
Bryan HURLBUT Lockheed Palo Alto Research Laboratory
Itzhak LEVIT Lockheed Palo Alto Research Laboratory
William LODEN Lockheed Palo Alto Research Laboratory
Gary STANLEY Lockheed Palo Alto Research Laboratory [phone]
Bo STEHLIN Lockheed Palo Alto Research Laboratory
Lyle SWENSON Knowledge Management Systems
The document was edited and updated in February 1995 by Applied Research Associates, Inc. to
reflect changes and additions to the system.
Version
October 1993
February 1995
Revised 12/1/97 COMET-AR User’s Manual i
Table of Contents (Brief)
Part I: INTRODUCTION
Chapter 1 Introduction
Part II: PROCEDURES
Chapter 2 Model Definition Procedures
Chapter 3 Basic Solution Procedures
Chapter 4 Adaptive Solution Procedures
Chapter 5 Utility Procedures
Part III: PROCESSORS
Chapter 6 Pre-Processors
Chapter 7 Element Processors
Chapter 8 Constitutive Processors
Chapter 9 Smoothing Processors
Chapter 10 Error Estimation Processors
Chapter 11 Mesh Refinement Processors
Chapter 12 Matrix/Vector Processors
Chapter 13 Special-Purpose Processors
Chapter 14 Post-Processors
Part IV: DATABASE
Chapter 15 Database Summary
Part V: SOLID MODEL INTERFACE
Chapter 16 Solid Model Interface (SMI)
ii COMET-AR User’s Manual Revised 12/1/97
Table of Contents (Detailed)
Part I: INTRODUCTION
Chapter 1 Introduction
1.1 Overview of COMET-AR
1.2 Purpose of This User’s Manual
1.3 Capabilities and Limitations of COMET-AR
1.4 Organization of COMET-AR
1.5 Execution of COMET-AR (The User Interface)
1.6 How to Use This User’s Manual
1.7 Related COMET-AR Documentation
1.8 Command Language Summary
1.9 Glossary of COMET-AR Terms, Notations, and Symbols
1.10 References
Part II: PROCEDURES
Chapter 2 Model Definition Procedures
2.1 Overview
2.2 Reference Frames and Coordinate Systems
2.3 Generic Model Definition Procedures
2.4 Node Definition Procedures
2.5 Element Definition Procedures
2.6 Material/Fabrication Definition Procedures
2.7 Orientation of Fabrication Reference Frames
2.8 Load Definition Procedures
2.9 Boundary Condition Definition Procedures
2.10 Automatic DOF Suppression and Drilling Stabilization
2.11 Sample Model Definition Procedures (Summary)
2.12 Model Definition via PATRAN and PST
2.13 Global Model to Analysis Model Translation Procedure
Chapter 3 Basic Solution Procedures
3.1 Overview
3.2 Procedure L_STATIC_1
3.3 Procedure NL_STATIC_1
Chapter 4 Adaptive Solution Procedures
4.1 Overview
4.2 Procedure AR_CONTROL
Chapter 5 Utility Procedures
5.1 Overview
Revised 12/1/97 COMET-AR User’s Manual iii
5.2 Procedure ES
5.3 Procedure EST_ERR_1
5.4 Procedure EST_ERR_SM
5.5 Procedure FACTOR
5.6 Procedure FORCE
5.7 Procedure INITIALIZE
5.8 Procedure REF_MESH_1
5.9 Procedure SOLVE
5.10 Procedure STIFFNESS
5.11 Procedure STRESS
5.12 Procedure MASS
Part III: PROCESSORS
Chapter 6 Pre-Processors
6.1 Overview
6.2 Processor AUS (Nodal Force Tabulation)
6.3 Processor COP (Constraint Processor)
6.4 Processor GCP (Generic Constitutive Processor)
6.5 Processor GEP (Generic Element Processor)
6.6 Processor PST (COMET-AR_to_PATRAN)
6.7 Processor REDO (Dataset Reformatter)
6.8 Processor RENO (Node Renumbering)
6.9 Processor RSEQ (Node Renumbering)
6.10 Processor TAB (Tabulation of Nodal Coordinates)
6.11 Processor NODAL
6.12 Processor GM2AM (Geometric to Analysis Model)
Chapter 7 Element Processors
7.1 Overview
7.2 Processor ES (Generic Element Processor)
7.3 Processor ES1 (SRI and ANS Shell Elements)
7.4 Processor ES5 (STAGS Shell Element)
7.5 Processor ES6 (STAGS Beam Element)
7.6 Processor ES1p (Variable-p Lagrange Quadrilateral Shell Elements)
7.7 Processor ES7p (ANS Shell Elts.; Var. Order Quads)
7.8 Processor ES36 (MIN3/6 Triangular Shell Elements)
Chapter 8 Constitutive Processors
8.1 Overview
8.2 Generic Constitutive Processor Description
8.3 Fabrication Definition
8.4 Material Property Definition
8.5 Analysis Control
8.6 Update Command
iv COMET-AR User’s Manual Revised 12/1/97
Chapter 9 Smoothing Processors
9.1 Overview
9.2 Processor SMT (Tessler Smoothing)
9.3 Processor SMZ (Zienkiewicz/Zhu Smoothing)
Chapter 10 Error Estimation Processors
10.1 Overview
10.2 Processor ERR (Generic Error Estimator)
10.3 Processor ERR2 (Error Estimates: Stress Smoothing)
10.4 Processor ERR4 (Error Estimates: Energy Smoothing)
10.5 Processor ERR6 (Error Estimates: Strain Smoothing)
10.6 Processor ERRa (Error Accumulator)
10.7 Processor ERRSM (Error Estimates: Smoothing-Based)
Chapter 11 Mesh Refinement Processors
11.1 Overview
11.2 Processor REF1 (Mesh Refinement: h /h /h/p)
c s t
Chapter 12 Matrix/Vector Processors
12.1 Overview
12.2 Processor ASM
12.3 Processor ASMs (Matrix Assembler)
12.4 Processor ITER (Iterative Linear Equation Solver)
12.5 Processor PVSOLV (Direct Linear Equation Solver)
12.6 Processor SKY (Direct Linear Equation Solver)
12.7 Processor SKYs (Direct Linear Equation Solver)
12.8 Processor VEC (Vector Algebra Utility)
12.9 Processor VSS (Vectorized Sparse Solver)
Chapter 13 Special-Purpose Processors
13.1 Overview
13.2 AMPC (Automatic Multipoint Constraint)
13.3 Processor COMET-AR (System Macroprocessor)
13.4 Processor TRIAD (Computational Frame Realignment)
Chapter 14 Post-Processors
14.1 Overview
14.2 Processor ARG (Adaptive Refinement Graphics)
14.3 Processor HDBprt (Database Print Utility)
14.4 Processor PST
Revised 12/1/97 COMET-AR User’s Manual v
Part IV: DATABASE
Chapter 15 Database Summary
15.1 Overview
15.2 Data Objects
15.3 Database Access
15.4 Database Organization and Evolution
Part V: SOLID MODEL INTERFACE
Chapter 16 Solid Model Interface (SMI)
16.1 Overview
16.2 Solid Model Interface (SMI) Options
16.3 The Discrete SMI Option
16.4 The User-Written SMI Option
vi COMET-AR User’s Manual Revised 12/1/97