Ask-The-experts ANSYS Advanced Meshing

8/13/2019 Ask-The-experts ANSYS Advanced Meshing
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2010 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary
Advanced Meshingin ANSYSMechanical
Govindan Nagappan

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umm ry
Meshing FrameworkImprovements
Direct meshing
Parameter handling
Improved Virtual Topologies
Mesh-based Connections
Improved Named Selections
Mesh Controls
Advanced Size Function
Body of Influence
Mesh Based Defeaturing
Improved Mapped Meshing
Pinch Control
Mesh Methods
Improvements in Shell meshing
Improvements in Hex meshing
Sweep
MultiZone meshing

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Direct Meshing
ANSYS Workbench meshing has been focused onautomated meshing:
Software automates choice of methods, physicsdefaults and controls
Interaction between methods is automated
At 13.0, the user has greater access to directlymesh bodies of multibody parts:
This provides more flexibility and control over themeshing process
Control the meshing sequence

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Direct Meshing
Direct Meshing advantages: Bodies can be meshed individually
Mesh seeding from meshed bodies influence
neighbors (user has sequence control)
Automated meshing can be used at any time to
finish rest of meshing (control where you want it
while keeping the automation)
When controls are added, only affected bodymeshes go out of date
More extensive mesh method interoperability

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Direct Meshing: Local Meshing
Individual bodies can be meshed (no need forsuppression as in 12.1)
Subsequent bodies use the attached face mesh
Direct Meshing allows for more combinations of how to handle the
common interface between bodies

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Direct Meshing: Local Remeshing
Automated meshing:
Mesh methods and orderdefined automatically
Good starting mesh
Direct meshing: On inspection, would like
more mesh in some spots:
Add method, inflation or
sizing control and upon
Generate Mesh, only this
body (and any affected
bodies) are re-meshed

7/47 2010 ANSYS, Inc. All rights reserved. 7 ANSYS, Inc. Proprietary
Direct Meshing: Selective Body
Updating
Similarly if only part of the geometry changes: Only affected bodies need
to be updated/remeshed
Significant time savings
on model change
Face Delete in DM
Geometry Refreshonly 1 body is out of date
Generate meshonly 1 body is meshed

Direct Meshing: State
Management
State management: The part/body tree willindicate which bodies need to be remeshed:State icons indicate status of bodies.
When mesh controls are added you will
notice that the state changes, even
though the mesh remains visible.
Body meshes can be generated or
cleared at body level.Generate mesh at mesh level will
generate the mesh for all unmeshed
bodies

Direct Meshing: Ordered Meshing
Automated meshing
Layer of tet
mesh required
as topology
changes
Direct meshing
With Direct Meshing:
Mesh thin sweep first,then mesh rest of model with
Automated meshing
Direct meshing complements the
automated meshingThin Sweep Mesh Method can handle this, but the
order the mesh is generated in is critical

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Parameterization in ANSYS
Meshing
Meshing controls can now be parameterized
Global controls and local controls Selection of parameter promotes the parameter to the WB project page
Geometry and Meshing parameters can be related using expressions in the parametermanager
New in AM 13.0!

Parameterization Project Example
Number of divisionson the outlet pipe
equal to two times its
length
Number of divisons
on the inlet pipe equal
to its length + 4
8+4=12d
ivisions
Inlet
Outlet

Parameterization Project Example
(Cont)

When to use?
To merge together a number of small (connected) faces/edges To simplify small features in the model
To simplify load abstraction for mechanical analysis
To create edge splits for better control of the surface mesh control New in AM13.0!
Virtual cell modifies the topology
Original CAD model remains unchanged New faceted geometry is created with
virtual topology
Virtual Topology
Without VT With VT

Edge Splits to Guide Meshing
VT edge splitsavailable to help
guide meshing:
Edge splits introduced to
constrain the mapped mesh
Difficult to get a good mesh
with complex wavy curves
Mesh is improved
Edge splits can be further
moved interactively

Mesh connections
For sheet models, connections can be defined asMesh connections
Options include similar options as other connections
Mesh connections will be created at mesh time (rather
than as CE in solver)

Mesh Connections
Create Automatic Connections Automatic connections are created
Displays result from
mesh connections

Mesh Connections
After meshing, user can also look at mesh connectivity
Automatic connections are created

Named Selections
Named Selections allow users to assign aname to one or more selected entities in DMor AM
The Named Selections used in DM can betransferred to AM by allowing in the Workbenchoptions (Tools/Options/Geometry Import) beforeopen a DM session
All entities within a Named Selection must be ofthe same topology
Easy to reselect groups that will be referencedoften
Named selections are automatically exported tosolver modules
Named Selections can be applied to the entitiesof the same size, type or location, by usingnew selection options New in AM 13!. See the
Appendix at the end for details
Named Selection groups can be imported from DesignModeler
and other CAD systems

Enhanced - Named Selections
New option to define selection by worksheet
Worksheet allows set of actions to build up anamed selection based on a criteria(size,
location, type, coordinate system, convert etc.
Able to quickly define criteria whencreating from Graphics Window

Named Selections
Named Selections can be applied to selected geometries Named Selections can be applied to a set of entities of thesame size, location or type by using the filterApply geometry
items of same
804 faces selected in
one click!New in AM13!

Sizing : Advanced Sizing Function
ASF : Off
Only edge sizes are
determined based on
curvature and are
controlled by the span
angle center Rest of the mesh is
generated with global
element size
Curvature or proximity is
not considered for face
and volume meshing
ASF : Curvature

Ask-The-experts ANSYS Advanced Meshing

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