Training Manual
• In the Customs Systems toolbox the FSI: Fluid Flow (CFX) > Static Structural system can be added to the Project Schematic
=
• Any project schematic can be saved/added to Custom Systems toolbox • To add a new workflow to Custom Systems, right-click on schematic white space and select Add to Custom from displayed pop-up menu
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
Pressure Loads
2-3
Thermal Stress Solution
July 2009 Inventory #002678
1-way FSI
Connecting Systems in Workbench
– Workbench will prompt for a custom template name to save
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002678
2-7
– Temperature transfer as a body load is a manual process (beta)
• CFD-Post performs interpolation process for vector and scalar quantities
– Mechanical nodal values are transferred by linear interpolation from the surrounding CFD surface nodes – If interpolation process cannot find a face to map to, then closest point is chosen – Not conservative – Interpolation process can be slow for large cases
• This includes both normal (Pressure) and tangential (Shear) loads • In fact force data that comes directly from the solution of the momentum equations is used
• Must be a .inp file written from Workbench (not Mechanical APDL) • CFD-Post recognizes .dat files as FLUENT files
– Check the Imported Load contour/vector plots in Mechanical
• All boundary condition names in CFX results file will be exposed via drop-down
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
2-9
July 2009 Inventory #002678
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
2-6
July 2009 Inventory #002678
1-way FSI
Using Custom Systems
– This transfers pressure loads from CFX to Mechanical
1-way FSI
Geometry and Mesh Considerations
Training Manual
• Fluid and Solid geometries should physically match
– Helpful for both geometries to come from a single CAD file – DM can easily extract a fluid volume from a CAD model of the structure
• Mesh does not need to match 1-to-1
– But similar mesh resolution will improve interpolation accuracy – Can write an ANSYS Input File and load into CFD-Post, along with the fluid mesh, to check interface mesh
Drag
Training Manual
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
2-5
July 2009 Inventory #002678
1-way FSI
Connecting Analysis Systems for FSI
2-2
July 2009 Inventory #002678
1-way FSI
Integrated Process in Workbench
Training Manual
Example Project Schematic
Geometry
CHT Mesh
CFD CHT Solution
Thermal Loads
Shared Data Connection
Transfer Data Connection
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
2-4
July 2009 Inventory #002678
1-way FSI
Connecting Analysis Systems for FSI
– Geometry Selection: Select faces on solid geometry to transfer CFD loads – Named Selection: Select existing named selections to transfer CFD loads
Training Manual
• These are automatically created after the import
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved.
2-8
July 2009 Inventory #002678
1-way FSI
Training Manual
• Alternatively, right-click on Solution cell in Fluid Flow system, select Transfer Data To New, then select the appropriate target system • Connections are automatically created between both systems
Imported Loads
• In Mechanical an Imported Load entry will automatically be added to the tree when solution data is transferred from CFX
• There are two Scoping Methods for imported loads
Chapter 2 1-way FSI
Solving FSI Applications using Workbench, ANSYS Mechanical and CFX
ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002678
– Connections that transfer data
• Used when output of one cell is input to a connected cell • Usually created between two cells of different types
– Both connection types are used for FSI systems in Workbench
1-way FSI
Data Transfer to Mechanical Systems
– Launched in background
Training Manual
• CFX data is transferred to Mechanical Systems via CFD-Post
• Only surface loads can be transferred automatically in Workbench
Training Manual
• Workbench supports two types of connections