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ANSYS2020R2-System-Coupling-Users-Guide
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System Coupling User's Guide
Release 2020 R2ANSYS, Inc.
July 2020Southpointe
2600 ANSYS Drive
Canonsburg, PA 15317
ANSYS, Inc. and
ANSYS Europe,
ansysinfo@ansys.com
Ltd. are UL
http://www.ansys.com
registered ISO
(T) 724-746-3304
(F) 724-514-9494
9001: 2015
companies.
Copyright and Trademark Information
© 2020 ANSYS, Inc. Unauthorized use, distribution or duplication is prohibited.
ANSYS, ANSYS Workbench, AUTODYN, CFX, FLUENT and any and all ANSYS, Inc. brand, product, service and feature
names, logos and slogans are registered trademarks or trademarks of ANSYS, Inc. or its subsidiaries located in the
United States or other countries. ICEM CFD is a trademark used by ANSYS, Inc. under license. CFX is a trademark
of Sony Corporation in Japan. All other brand, product, service and feature names or trademarks are the property
of their respective owners. FLEXlm and FLEXnet are trademarks of Flexera Software LLC.
Disclaimer Notice
THIS ANSYS SOFTWARE PRODUCT AND PROGRAM DOCUMENTATION INCLUDE TRADE SECRETS AND ARE CONFID-
ENTIAL AND PROPRIETARY PRODUCTS OF ANSYS, INC., ITS SUBSIDIARIES, OR LICENSORS. The software products
and documentation are furnished by ANSYS, Inc., its subsidiaries, or affiliates under a software license agreement
that contains provisions concerning non-disclosure, copying, length and nature of use, compliance with exporting
laws, warranties, disclaimers, limitations of liability, and remedies, and other provisions. The software products
and documentation may be used, disclosed, transferred, or copied only in accordance with the terms and conditions
of that software license agreement.
ANSYS, Inc. and ANSYS Europe, Ltd. are UL registered ISO 9001: 2015 companies.
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For U.S. Government users, except as specifically granted by the ANSYS, Inc. software license agreement, the use,
duplication, or disclosure by the United States Government is subject to restrictions stated in the ANSYS, Inc.
software license agreement and FAR 12.212 (for non-DOD licenses).
Third-Party Software
See the legal information in the product help files for the complete Legal Notice for ANSYS proprietary software
and third-party software. If you are unable to access the Legal Notice, contact ANSYS, Inc.
Published in the U.S.A.
Table of Contents
Introduction to the System Coupling User's Guide .................................................................................... 15
System Coupling Overview ...................................................................................................................... 17
The ANSYS Product Improvement Program ........................................................................................... 17
System Coupling Capabilities ................................................................................................................ 18
System Coupling Capabilities by Context ........................................................................................ 18
Variables Supported by System Coupling ........................................................................................ 22
Participant Support of System Coupling Capabilities ....................................................................... 23
System Coupling Contexts: GUI, CLI, and Workbench .............................................................................. 26
Product Licensing Considerations ......................................................................................................... 26
Steps of a System Coupling Analysis ...................................................................................................... 28
System Coupling Analysis Types ............................................................................................................ 29
Steady Analysis Type ....................................................................................................................... 29
Transient Analysis Type ................................................................................................................... 31
System Coupling Settings ..................................................................................................................... 32
Units in System Coupling ...................................................................................................................... 32
Unit Conversions ............................................................................................................................ 33
Units Syntax ................................................................................................................................... 33
Unit Multipliers ............................................................................................................................... 34
Commonly Used SI Units ................................................................................................................. 35
SI Base Units ............................................................................................................................. 35
SI Data Transfer Quantity Units .................................................................................................. 35
SI Derived Units ........................................................................................................................ 36
Commonly Used Non-SI Units ......................................................................................................... 36
Stops and Restarts of System Coupling Analyses ................................................................................... 37
Stopping a Coupled Analysis ........................................................................................................... 37
Restarting a Coupled Analysis ......................................................................................................... 38
Migrating to ANSYS System Coupling 2020 R2 ....................................................................................... 39
Migrating Across Multiple Releases ................................................................................................. 39
Migrating Command-Line System Coupling Scripts ........................................................................ 39
Changes to the Data Model ....................................................................................................... 40
Changes to Files ....................................................................................................................... 43
Changes to Commands ............................................................................................................. 43
Changes to Command-Line Options .......................................................................................... 44
Changes to Expert Settings ....................................................................................................... 45
Known Issues and Limitations ............................................................................................................... 45
Using System Coupling's User Interfaces ................................................................................................. 49
Overview of System Coupling's User Interfaces ...................................................................................... 50
Supported Coupling Participants .................................................................................................... 50
Coupling Interfaces and Data Transfers ............................................................................................ 51
Rules for the Creation of Coupling Interfaces ............................................................................. 52
Rules for the Creation of Data Transfers ..................................................................................... 53
Steps of a Coupled Analysis ............................................................................................................. 53
Participant Solution Sequencing ..................................................................................................... 54
Working with System Coupling's Data Model ........................................................................................ 55
Data Model Structure ...................................................................................................................... 55
Root-Level Containers ..................................................................................................................... 57
Viewing Data Model Contents ......................................................................................................... 58
Viewing a Container's Contents ................................................................................................. 58
Viewing an Object's Children .................................................................................................... 59
iii
Release 2020 R2 - © ANSYS, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
Viewing the Contents of an Object's Children ............................................................................ 60
Using System Coupling's Graphical User Interface (GUI) ......................................................................... 60
Starting the System Coupling GUI ................................................................................................... 61
Starting the GUI from the Start Menu ........................................................................................ 61
Starting the GUI from the Command Line .................................................................................. 61
System Coupling GUI Components ................................................................................................. 62
System Coupling GUI Messages and Icons ....................................................................................... 67
System Coupling GUI Menus ........................................................................................................... 70
Menu-Bar Menus ...................................................................................................................... 70
Context Menus ......................................................................................................................... 73
Using the System Coupling Command-Line Interface (CLI) ..................................................................... 75
Starting the System Coupling CLI .................................................................................................... 75
Getting Help in the System Coupling CLI ......................................................................................... 76
Preparing for a Coupled Analysis ........................................................................................................... 77
Setting Up a Coupled Analysis Directory Structure ........................................................................... 78
Completing Participant Setups ........................................................................................................ 79
Additional Participant Setup Considerations .................................................................................... 80
Generating Participant Files ............................................................................................................ 81
Creating a Coupled Analysis .................................................................................................................. 81
Adding the Participants .................................................................................................................. 82
Adding a Coupling Interface ........................................................................................................... 83
Adding a Data Transfer .................................................................................................................... 86
Setting Geometry Transformations for Models with Different Orientations ....................................... 88
Modifying Coupled Analysis Settings .................................................................................................... 89
Changing Data Model Settings ........................................................................................................ 89
Frequently Edited Data Model Settings ..................................................................................... 89
Coupling Control ................................................................................................................ 90
Coupling Participant ........................................................................................................... 93
Solution Control ................................................................................................................. 98
Coupling Interface ............................................................................................................ 100
Output Control ................................................................................................................. 101
Changing Data Model Setting Values ....................................................................................... 103
Enabling Expert Settings ............................................................................................................... 104
Requesting Debug Output ............................................................................................................ 104
Running a Coupled Analysis ................................................................................................................ 105
Starting the Solution ..................................................................................................................... 105
Monitoring Solution Progress ........................................................................................................ 106
Common Coupled Analysis Tasks ......................................................................................................... 107
Saving a Coupled Analysis ............................................................................................................. 107
Working with Coupled Analysis Snapshots ................................................................................... 108
Creation of Snapshots ............................................................................................................. 108
Saving a Snapshot .................................................................................................................. 109
Printing a List of Available Snapshots ...................................................................................... 109
Opening a Snapshot ............................................................................................................... 110
Deleting a Snapshot ............................................................................................................... 110
Opening a New Working Directory from the GUI ............................................................................ 111
Reconnecting the GUI to a Running Coupled Solution ................................................................... 111
Prerequisites ........................................................................................................................... 111
Disconnecting from the Running Solution ............................................................................... 112
Reconnecting to the Running Solution .................................................................................... 113
Stopping a Coupled Analysis ......................................................................................................... 114
Release 2020 R2 - © ANSYS, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.iv
System Coupling User's Guide
Restarting a Coupled Analysis ....................................................................................................... 115
Creation of Restart Points ........................................................................................................ 116
Restarting a Coupled Analysis in the GUI ................................................................................. 116
Restarting a Coupled Analysis in the CLI ................................................................................. 118
Advanced Coupled Analysis Tasks ....................................................................................................... 120
Setting a Participant Connection Timeout Interval ......................................................................... 120
Using Interactive Solve Commands ............................................................................................... 121
Simultaneous Execution of Participant Solutions ........................................................................... 122
System Coupling's Participant Grouping Process ..................................................................... 123
Creation of Participant Groups .......................................................................................... 123
Consolidation of Participant Groups .................................................................................. 124
Enabling Simultaneous Participant Solutions ........................................................................... 124
Enable Simultaneous Participant Solutions in the GUI ........................................................ 124
Enable Simultaneous Participant Solutions in the CLI ......................................................... 124
Execution of Simultaneous Participant Solutions ..................................................................... 125
Simultaneous Participant Solution Examples ........................................................................... 125
Using Parallel Processing Capabilities ............................................................................................ 127
Recommended Workflow for Parallel Execution ....................................................................... 128
Parallel Processing for Coupling Participants ............................................................................ 129
Applying Partitioning to Coupling Participants .................................................................. 130
Machine List and Core Counts ........................................................................................... 133
Resource Allocation Fractions ........................................................................................... 133
Participant Partitioning Algorithms ................................................................................... 134
Choosing a Partitioning Algorithm .............................................................................. 135
Partitioning Algorithm Pros and Cons .......................................................................... 135
Participant Partitioning Examples ...................................................................................... 136
Shared Parallel: Allocate Machines ............................................................................... 140
Shared Parallel: Allocate Cores ..................................................................................... 141
Distributed Parallel: Allocate Cores .............................................................................. 142
Distributed Parallel: Allocate Machines ........................................................................ 143
Parallel Options for System Coupling ....................................................................................... 144
Parallel Options for Participant Products .................................................................................. 144
Running a Workbench Setup in a User Interface ............................................................................. 145
Reviewing Coupled Analysis Output and Results ................................................................................. 147
Reviewing Convergence Diagnostics Charting Output ................................................................... 148
Core Charting Functionality .................................................................................................... 149
Chart Tab Context Menu ......................................................................................................... 150
Viewing the Convergence Diagnostics Chart ........................................................................... 152
Viewing Data Transfer Quantity Diagnostic Charts ................................................................... 153
Writing Charting Diagnostics to CSV Files ............................................................................... 155
Postprocessing Coupling Results in ANSYS EnSight ........................................................................ 156
Generation of EnSight-Formatted Output Files ........................................................................ 156
Loading Coupling Results into ANSYS EnSight ......................................................................... 158
Loading Results from the GUI ............................................................................................ 158
Loading Results from the CLI ............................................................................................. 158
Loading Results with ANSYS EnSight Startup ..................................................................... 158
Opening Results in an Existing Instance of EnSight ............................................................ 159
Reviewing Results in EnSight ................................................................................................... 160
Using System Coupling in Workbench .................................................................................................... 165
Overview of System Coupling in Workbench ....................................................................................... 165
Supported Coupling Participants for System Coupling in Workbench ............................................. 166
v
Release 2020 R2 - © ANSYS, Inc. All rights reserved. - Contains proprietary and confidential information
of ANSYS, Inc. and its subsidiaries and affiliates.
System Coupling User's Guide
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