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© 2011 ANSYS, Inc. January 4, 2013
1
Release 14.5
14. 5 Release
Solving FSI Applications Using
ANSYS Mechanical and ANSYS Fluent
Lecture 5
Co-simulation Convergence
© 2011 ANSYS, Inc. January 4, 2013
2
Release 14.5
Outline
Convergence
This lecture focuses on converging System Coupling simulations.
There are many controls that can impact convergence, so we’ll start
by identifying the controls available.
Obtaining good convergence requires a methodical workflow. We’ll
discuss:
• Using separate fluid and structural simulations to first identify
any non-FSI problems
• Correct initialization for FSI cases
• Monitoring convergence
• Convergence controls and their effect
• Identifying unstable FSI case and how to stabilize the solution
• General convergence advice and debug tools
© 2011 ANSYS, Inc. January 4, 2013
3
Release 14.5
Convergence requires an understanding of the solution
process and the physics that your setup defines
• This may be different than the real-world physics
• E.g. your initial conditions may be different
When convergence difficulties are encountered, follow
the solution process:
Use monitor points and backup files to answers these
questions
Convergence
How does
the flow field
respond?
What is the
force passed to
the structure?
How does
the structure
respond?
What are the
displacements
passed back
to Fluent?
© 2011 ANSYS, Inc. January 4, 2013
4
Release 14.5
There are a number of controls that play a role in good
convergence, including:
• Initialization
• Time Step Size
• Stability Controls
• Number of Fluent iterations per step
• Number of Coupling Iterations
• Interface Under Relaxation Factors
It is important to understand why a case has
convergence problems before adjusting these controls
Convergence
© 2011 ANSYS, Inc. January 4, 2013
5
Release 14.5
Before starting an FSI simulation, you should run
separate fluids and structural simulations using
representative loads:
• Checks that the basic setup is correct for each side
• Use settings that are as close as possible to the planned FSI
simulation (same time step size, etc)
• Structural simulation using a fixed Pressure boundary
• A Fluent simulation with a fixed boundary or a simply moving
boundary
If it’s difficult to provide representative fluid loads, you
could run a System Coupling simulation with loads
passed 1-way from Fluent to the structure
Convergence
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