ansys, inc. proprietary © 2004 ansys, inc. chapter 6 ansys cfx 9.0

ANSYS, Inc. Proprietary© 2004 ANSYS, Inc.

Chapter 6

ANSYS CFX 9.0

Chapter 6

ANSYS CFX 9.0

ANSYS, Inc. Proprietary

© 2004 ANSYS, Inc.

October 1, 2004Inventory #002156

6-29.0 New Features

Overview

• CFX Strategy and Roadmap Summary• CFX-in-Workbench• CFX-Mesh


© 2004 ANSYS, Inc.


6-39.0 New Features

CFX Product Strategy

• Continued development of advanced, best-in-class core technologies– CFX is absolutely major league CFD

• Part of ANSYS Integrated CAE Strategy– CFX products and technologies integrating into ANSYS

Workbench

• Customer benefits from:– Leading robustness/speed/accuracy for CFD solution– CAE interoperability with other Workbench tools and

physics – major differentiator


© 2004 ANSYS, Inc.


6-49.0 New Features

CFX Roadmap Summary

• CFX-5– CFX-5.7 current major release – Q2 2004– CFX-5.7.1 – first integration into Workbench– CFX-5.8 – next major release – Q2 2005

• CFX-Mesh– CFX-Mesh 8.1 – first integration into Workbench– CFX-Mesh 9.0 – major improvements– CFX-Mesh will continue to be closer integrated into Workbench with each

successive release

• Turbo Products not covered:– CFX-TurboGrid– CFX-BladeGen


© 2004 ANSYS, Inc.


6-59.0 New Features

CFX-in-Workbench

• CFX-Mesh is already in Workbench– Provides integrated CAD/geometry/meshing environment

• The 3 major modules of CFX-5 – CFX-Pre, Solver, CFX-Post – are now also integrated as Tabs– CFX-5.7.1 is bug-fixed and “GUI harmonized” 5.7– Full project page support for files and launching– Single install– Shows up as the “Advanced CFD Application”

• First time for complete, general-purpose CFD solution in one environment– CAD/geometry/meshing/physics/solution/post all together


© 2004 ANSYS, Inc.


6-69.0 New Features

CFX-in-Workbench, DesignModeler


© 2004 ANSYS, Inc.


6-79.0 New Features



© 2004 ANSYS, Inc.


6-89.0 New Features



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6-99.0 New Features



© 2004 ANSYS, Inc.


6-109.0 New Features



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CFX-in-Workbench Example


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Positioning of CFX-Mesh

• Incorporated natively into ANSYS Workbench• Tuned to produce as optimal as possible meshes for CFX-5• Tightly coupled with DesignModeler

• For easy-to-use, high-quality CFD mesh generation – Heavily defaulted inputs; very automated sensitivity to geometric

detail – few user inputs required– Produces orthogonal and smooth near-wall prism region for boundary

layer resolution

• (Should use ICEM CFD when:– Have very large number of geometric surfaces, or have significantly

faulty CAD– Need to do manual mesh editing– Need 3D blocked Hexahedral elements)


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Basics

• Hybrid mesh approach

– Triangular surface mesh



– Prismatic/Inflated mesh




– Pyramidal intermediate elements




– Pyramidal intermediate elements

– Tetrahedral mesh generator


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Hybrid mesh approach


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Inflation marked surfaces


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Initial surface triangulation


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Basic inflation – 5 layers


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Complete hybrid mesh


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New features in CFX-Mesh 9.0

• Persistence of mesh setting following geometry changes

• 2D/Axisymmetric meshing capability• Improved prism meshing• Beta Virtual Topology capability for faulty CAD;

currently uses existing Workbench VT technology• Direct CAD import• Local parallel meshing capability• Body specific meshing• Improved mesh control setting


© 2004 ANSYS, Inc.



Persistence – “Updated” geometry


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Mesh settings persist


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2D meshing capability


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2D mesh (1 element thick)


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Axisymmetric mesh


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Improved prism meshing

• Improved normal smoothing• Extended inflation layers at unit aspect ratio


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Direct CAD import

CAD Packages include:• Autodesk Inventor• Solid Edge• Solid Works• Unigraphics• Mechanical Desktop

Supports geometry updates

i.e. persistent IDs


© 2004 ANSYS, Inc.



Virtual topology – Beta capability

• Virtual topology modifies the model seen by the UI and mesh algorithms, it does not modify the underlying geometry

• Virtual face– A virtual face is a combination of faces that will be

treated as in individual surface • Virtual edge

– A virtual edge is a combination of edges that will be treated as in individual surface

ansys, inc. proprietary © 2004 ansys, inc. chapter 6 ansys cfx 9.0

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