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15.0 Workbench Meshing
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In
troduction
ANSYS Meshing is a component of ANSYS Workbench
Creates Meshes for different Physics and Solvers
CFD, Mechanical, Electromagnetic
Easy Customization
Methods, Sizes of Entities, Parameterization
Integrates directly with other WB systems
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Re
lease Highlights
Performance
Robustness
Usability
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Performance
Robustness
Usability
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CAD
Geometry
DesignModeler
SpaceClaim
Mechanical/Meshing
Common preprocessing bottlenecks
Targeted improvements to reduce/eliminate thesebottlenecks
Transferring
large models
Shared
TopologyEditing large
models Transferring
large models
Meshing large
assemblies
Swept
Meshing
Shell
Meshing
Large
Meshes
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Improvements in many areas:
– Serial Improvements:
• Size Function:
– especially proximity SFand reduced memory
• Improved Body of Influence (BOI)
• Mesh Methods: – Patch Conforming Tet
– Sweep/Thin Sweep
– MultiZone
–Shell Meshing
– Parallel part by part meshing
– Improved memory limits
Performance Improvements
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Patch Conforming Tet:Speed Improvements
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Patch Conforming Tet:Memory Improvements
Note: Quadratic mesh does not
see as much benefits
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Sweep:Speed Improvements
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Sweep:Memory Improvements
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MultiZone:Speed Improvements
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MultiZone:Memory Improvements
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Shell Meshing:Speed Improvements
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Shell MeshingMemory Improvements
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Parallel part by part meshing
Parallel Part meshing• Simultaneously meshes multiple
parts on multiple CPU’s
• Works for all part mesh methods
• For mesh methods that mesh
in parallel will utilize cores
for both part meshing and
body meshing (user should
set Number of CPUs for
meshing methods and
Number of CPUs for partmeshing appropriately)
• Program controlled will attempt to
use all cores on the machine
provided there is enough RAM
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Performance improvements for largeassemblies: Generic Model – Hex Mesh
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Performance improvements for largeassemblies: Generic Model – Tet Mesh
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Performance improvements for largeassemblies: Generic Model – Hex Mesh
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Performance improvements for largeassemblies: Customer Models
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Improved memory limits
Increased memory limits in Workbench• R14.5 limit: ~300 M cells (elements)
• R15.0 used to generate 817 M cells
– 6 hours
–Windows 64-bit machine
– 96 GB RAM
– Multi-body part
• Windows only
Generic Aircraft Engine Combustor
Single body, single part
732 M cells (prism + tet)
Generate meshes 2-3x larger
than before, while leveraging
benefits of Workbench
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Performance
Robustness
Usability
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Robustness Improvements
• Mesh failure handling
• Improved PI topology checking
• Improved hex meshing
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Mesh Failure Handling
Improved failure handling: – Better user indication
• Markers to help find
problematic faces
On inspection, use single/multiple
edge display to see holes in mesh
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Mesh Failure Handling
If Meshing fails, user can export meshand edit in Fluent Meshing or ICEM CFD (File->Export)
Overlapping faces exist
Mesh editing tools in ICEM
CFD/Fluent Meshing can quickly fix
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Better user indication: – When mesh sizes are changed, and mesh goes
out of date, bodies are indicated in yellow
Mesh Failure Handling
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PI Topology Checking Control
Why is this failing?
Mesher is often stricter
than it needs to be.
Is this a problem?
The Topology Checking option determines whether the
mesher performs topology checks for Patch Independent
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PI Topology Checking Control (while meshing)
User has 2 options:
1) Improve sizing controls tocapture feature and re-mesh
2) Turn off Topology checking:
Mesher will respect mosttopology, but user shouldvalidate important features arein the named selections.
Min size was too
large originally
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Improved hex meshing: MultiZone
MultiZone• Option to use MultiZone as default Sweep
mesh method
• Improved:
–Consistency (common controls, etc)
– Robustness
– Mapped meshing
• Support for internal loops
• GAMBIT submapper
– Feature capturing
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MultiZone: Use MultiZone for Sweepable bodies
MultiZone w/Automatic method:• MultiZone is used in place of Sweep
for Sweepable bodies
• Program controlled inflation works
in 3D
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MultiZone: Improved consistency
•
Support for Body/Sphere of Influence (BOI/SOI)
• Support for inside out biasing
Line BOI
Solid BOI
SOI
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MultiZone: Improved consistency
Mapped Mesh: Internal Number of Divisions
• Radial Number of Divisions becomesInternal Number of divisions:
– Now supports radial cases and axial cases
– Used for MultiZone and Sweep
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MultiZone: Improved robustness
•Improved robustness for swept mesh alongvarying profiles (blades, etc.)
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MultiZone: Improved robustness
•Improved robustness/quality in inflation
• Improved robustness for thin andhigh aspect ratio models
• Improved robustness in imprinting and side
face handling
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MultiZone: Mapped meshing
• Support for circular loop handling:
Circular internal loops on
side faces submapped
With inflation, good
quality mesh is
achieved on circular
internal loops
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Performance
Robustness
Usability
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Usability Improvements
•Support for local min size control
• Reverse edge bias
• Hotkeys
• Node/Element Selections
• Report Generator
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• Local control for curvaturesizing for body, face, andedge sizing controls
Local min size control
The global min size limits curvature everywhere
except for areas where local controls override
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Reverse edge bias
• Option in edge sizing for biasing to reverse edge direction
for selected edges
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• Ctrl+ A: Select All Objects
• Ctrl+ B: Body Filter Selection
• Ctrl+ E: Edge Filter Selection
•
Ctrl+ F: Face Filter Selection
• Ctrl+ P: Point Filter Selection
• F6: Toggle Model Apperance
• F7: Zoom to Fit
• F8: Hide Selected Face
• F9: Hide Selected Object
Hotkeys
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Node/Element SelectionMesh pick mode Element FilterNode Filter
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Selection Information Window
Selection information
including element id, type,
corresponding body, and
node list
User can control information
d l i f fi d
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Use Named Selections of geometry to findattached nodes and elements
Grow layers of mesh using criterion based selections
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Report Generator
Report generator from Mechanical now also available in
Meshing, and provides a lot of useful information:
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Thank you for your time
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