Solving FSI Applications Using ANSYS Mechanical and ANSYS CFX

This training course covers the process of performing one-way and twoway FSI in Workbench between ANSYS CFX and ANSYS Mechanical.
It is intended for users with some experience using both CFX and Mechanical (orMechanical APDL).
Course Objectives:
– Provide an understanding of the Workbench user interface, as related to FSI workflows
– Learn the procedures for performing one and two-way structural and thermal FSI analyses, including steady state and transient, using a co-simulation approach (both solvers running together)
– Learn the procedures for performing various one-way FSI analyses, including thermal and structural, steady state and transient, for a variety of different load types

Mesh Motion in CFX
It is important to understand mesh motion before performing FSI calculations that result in mesh motion • Otherwise the mesh may “fold” causing the solver to fail
Mesh movement in CFX does not produce, or arise from, fluid velocities • By comparison, in structural simulations the mesh velocity and structure velocity are the same
The mesh velocity and change in element volume are accounted for in the solved equations • Mass is fully conserved • 2nd order transient scheme used by default

Two-way FSI Overview, Geometry and Meshing
This lecture starts by describing how the FSI coupling process works. The main features and capabilities are then discussed along with the current limitations

Two-way FSI Setup
Mechanical Setup This section will cover the Mechanical setup in the context of a 2-way FSI simulation. We’ll discuss Analysis Settings, creating Fluid Solid Interfaces and other topics relevant to FSI simulations.
CFX Setup The CFX setup for FSI simulations will be covered next. In addition to describing how to create FSI boundaries to send/receive data from MAPDL, we’ll discuss creating useful monitor data, solution output and FSI solver controls.

Two-way FSI Solving and Post Processing
Solution Process Here we discuss starting and monitoring the FSI solution in serial and parallel. The various log and output files are also discussed. Post Processing This section will discuss common post-processing in CFD-Post and how to post-process FSI results in the Mechanical post-processor

Converging Two-way FSI Simulations
This lecture focuses on converging FSI 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.
• 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

Static Data Transfers
Direct Project Schematic Connections Details on mapping CFD loads to Mechanical by connection cells on the project schematic External Data Connection to Mechanical This discusses using External Data to import loads to Mechanical

6-DOF Rigid Body Solver in CFX
CFX includes a 6-DOF rigid body solver Fluid forces/torques on a body auto-calculated Body response included in flow solution • Either via mesh motion or via immersed solid
Simplified FSI case where body does not change shape under fluid load
• Can make assumptions about its behaviour
• Does not need the expense of a full structural simulation
• If stresses are of interest then 6DOF is not suitable; perform a 2way FSI instead

Immersed Solids in CFX
A way to represent a moving solid without deforming the mesh
Fluid mesh is created that covers both the fluid and solid regions
Overlapping solid mesh is created that represent the initial position of the solid
The solver locates the fluid nodes that overlap with the solid mesh
Fluid velocity at overlapping nodes set equal to solid body velocity, capturing the influence of the solid

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