ansys meshing 12.0
DESCRIPTION
Ansys 12.0 MeshingTRANSCRIPT
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ANSYS Meshing ANSYS Meshing ANSYS Meshing 12.0
ANSYS Meshing 12.0
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ANSYS Meshing 12 0
ANSYS Meshing 12 012.0
Introduction12.0
Introduction
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Meshing Overview
ANSYS Workbench process automation Physics-aware meshing Meshing in batch
P t i /P i t t hi Parametric/Persistent meshing Adding controls for meshing flexibility
mesh type/method mesh type/method mesh sizing mesh alignmentes a g e t mesh quality mesh feature capturing
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Process Automation
Meshing comes as a cell of a Workbench Analysis es g co es as a ce o a o be c a ys sSystem (Mesh/Model)
Or as its own Component System.
Regardless of what System the Mesh/Model cell is invoked from the meshing tools are the same
However, the meshing defaults are based on the physics preference of the system
The mesh is provided to any downstream system
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Downstream systems can be linked to the Mesh cell of any system
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Physics-Aware Meshing
There are four physics preferences in the Meshing p y p gapplication, each using appropriate defaults for that physics
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Meshing in Batch
Because the meshing is highly automated, the meshing application can be run in batch and a user can essentially skip the meshing step. For example:
Use Update to generate the
mesh in batch.The Progress monitor gives
progress.After updating theAfter updating the
mesh you can Edit it to view the
mesh or add dditi l t l
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additional control.
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Parametric/Persistent Meshing
In the following slides, we will see how mesh methods and mesh controls can be inserted to control the properties of the mesh.
These controls persist with any geometry changesThese controls persist with any geometry changes. The process of updating the mesh is the same as in the
batch meshing Added controls continue to apply Well controlled mesh is automated for subsequent
design iterations in batchdesign iterations in batch This makes parametric/persistent meshing inherent to the
process
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p
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Adding Controls for Flexibility
As demonstrated, Meshing in Workbench is designed to be invisible to the user
However, since a well controlled mesh is often required for higher solution accuracy and efficiency there is afor higher solution accuracy and efficiency, there is a great deal of flexibility to control: mesh type/method mesh sizing mesh alignment mesh quality mesh feature capturing
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Adding Mesh Controls
Lets look at an assembly model: You can see in this
case that Workbench automatically assigns:
Contact is automatically
defined between assigns:
Physics based sizing
Interfaces
parts
Mesh object: additional controls
can be inserted
Global controls: Physics preferences, sizings inflation etc
Interfaces between parts
User can go into these defaults and sizings, inflation, etc.adjust as they see fit.
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Adding Mesh Controls
Mesh Methods: Parts are meshed as i t h happropriate, hex where
possible, else tets User can insert mesh
methods to override the
Some parts are meshed with
patch conforming tetrahedral method
methods to override the defaults.
Some parts are meshed with
general sweep
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Adding Mesh Controls
Mesh Controls (Virtual Topology): Geometry and mesh
defeaturing tools are available to reduce the element/cell count in non
Lets see how we can coarsen mesh
element/cell count in non-critical regions
Manual virtual topologies help user control which
in non-critical regions
Virtual Topologies can
be created
help user control which features to capture
be created automatically, or
manually as shown here.
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Mesh is refined to respect each face
Mesh walks over details
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Adding Mesh Controls
Mesh Controls (Auto VT): Automatic virtual topologies
can be created and then user can edit these manually for optimum controlfor optimum control
Mesh without Virtual TopogiesVirtual Topogies
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Mesh after automatic
Virtual TopologiesAutomatic
Virtual Topologies
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Adding Mesh Controls
Mesh Controls (Sizing): Sizing controls are available
at the body, face, edge, and vertex levelvertex level
Other sizing controls include:
Sphere of influencep Body of influence Curvature/Proximity
sizing
Now lets apply a body
sizing to improve
uniformity of mesh
Insert body sizing,sizing,
cross hatch represents
size
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Resulting mesh
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Adding Mesh Controls
Mesh Controls (Pinch): If Virtual Topologies (VTs)
arent enough for geometry simplification pinch featuressimplification, pinch features can further simplify the model
The pinch controls use mesh pbased defeaturing and can be applied manually or automatically like VTs.
Notice bad mesh in areas
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Insert manual pinch controls to remove unwanted features
Manual pinch feature removes features at mesh level allowing for easier simplification than geometry level for some configurations.
Like Automatic Virtual Topologies, there is Automatic Pinch
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Adding Mesh Controls
Mesh Control (Mapped Face):
Th fThe face mesh
structure can be
changed by adding
Select face(s) to
Since the face has a cutout, sub-mapping is done to get a mapped
mesh
mapped face
controls
have a mapped
mesh
Face is meshed
with mapped
quads split to tris
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Adding Mesh Controls
Mesh Methods and Controls: This example shows how a variety of mesh controlsa variety of mesh controls and methods can combine to provide great flexibility
Default tet mesh Hex mesh would improve solution
accuracy
Add Virtual Faces to aid in hex
meshing
Add MultiZone Pure hex mesh is bl t bAdd MultiZone method for pure hex mesh
able to be generated
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Adding Mesh Controls
Mesh Methods and Controls: There is an extensive list of
additional mesh methods/controls, but this gives a general overview of
Apply body sizing with
smaller mesh size
Refined hex mesh for
better accuracy
gives a general overview of the use of these controls.
Section plane of hex mesh
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Adding Controls for Flexibility
The controls that were added are stored as objects in the mesh folder
These controls persist to design changesThese controls persist to design changes If a new design makes it impossible to update controls
from a previous design, the software puts a ? to indicate a control that has become invalid and should be inspected by the user.
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ANSYS Meshing 12.0 ANSYS Meshing 12.0 gFeature Update
gFeature Update
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ANSYS 12.0 Meshing Goals
Next generation solution for GAMBIT and CFX-Mesh customers: Follows Workbench guiding principles:
Parametric Persistent Highly AutomatedParametric, Persistent, Highly-Automated, Flexible, Physics-aware, Adaptive Architecture
Integration of TGrid and ANSYS ICEM CFDIntegration of TGrid and ANSYS ICEM CFD meshing methods to increase power and flexibility of Workbench meshing solution
Further evolution of meshing tools and technologies for Mechanical, ANSYS Emag, Explicit and CFD meshing
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Explicit and CFD meshing
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Mesh Controls
Physics-based mesh controls Support for CAD instances Arbitrary mesh matching Mapped mesh controlsMapped mesh controls Corner controls to help define mapping strategy
Pinch featureAd d Si F i Advanced Size Functions
Interface/contact handling between parts Contact sizingContact sizing Arbitrary mesh matching Patch independent option: Match mesh where
ibl
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possible
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Fluids Physics-based Mesh Controls
ANSYS 12.0 is the first release targeting CFD needs using our proven GAMBIT and TGridmeshing technology
Better CFD meshing defaults Automated CFD meshing process
CFD/Fl t h h k t l CFD/Fluent shape check controls
Support for FLUENT boundary conditions, mesh size functions, etc.,
Improved inflation controls Program controlled inflation
S th t iti t l
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Smooth transition controls
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CFD Meshing
Automated CFD meshing process CFX/FLUENT solver preference added to tailor mesh
based off solver Add d i t d f lt Added appropriate defaults
Added Skewness quality metric for FLUENT
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CFD Meshing
3D Bodies (Zones) Solid/Fluid CAD parts can be marked in DM as Air/Fluid CAD parts can be marked in DM as Air/Fluid
Display of Solid/Fluid indicates type FLUENT will use this for 3D Zone creation
2D Zones
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Named Selections (for Boundary Conditions) pass through Workflow (CADGeometryMeshingFLUENT)
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Improved CFD Inflation
Program Controlled Inflation Will inflate off all faces that are not in a named selectionWill inflate off all faces that are not in a named selection Or user can inflate off a named selection, or insert inflation control
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Structural Physics-Based Mesh Controls
Efficient meshing for physics Rigid body contact meshing
Edges/Faces in contact area are only things meshed
Centroid defined for massG k t hi Gasket meshing Quadratic edges/faces on top and bottom Linear edges/faces on side Linear edges/faces on side
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Rigid Body Meshing (3D)
Only faces of rigid body in contact get meshed
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Rigid Body Meshing (2D)
Only edges of rigid sheet in contact get meshed
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Gasket Elements
More automated way of meshing gaskets
Quadratic faces on source/targetQuadratic faces on source/target
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Linear faces on sides
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Support for CAD Instances
Instances defined in Pro/E, Solidworks, etc. are used in meshing (geometry/mesh is copied) Geometry transfer/meshing speedup
Selection by instance
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Meshing of Instances
Meshing speed improvementMeshing speed improvement 58% time reduction in meshing
Instance selection:
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Meshing of Instances
Overall speed improvementsOverall speed improvements Geometry transfer: 77% time reduction Meshing speedup: 55% time reduction
T t l i t d hi f thi d l d d f Total import and meshing of this model reduced from 533 to 192 seconds (64% time reduction)
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Arbitrary Mesh Matching
Match control to copy mesh to similar topologiesMatch control to copy mesh to similar topologies based off 2 coordinate systems
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Improved Mapped Control
Support for side/cornerSupport for side/corner controls to define strategy for sub-mapping
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Pinch Feature
Mesh pinch out feature added for defeaturing at mesh levelp g Automated based off shell thickness or user defined tolerance Works in conjunction with Virtual Topologies to simplify
meshing constraints
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Automatic Pinch Generation
With automatic pinch generation user can pinch features under a defined size and remove small features from the mesh
Use shellUse shell thickness, or define a tolerance
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Manual Pinch Feature
With Auto-pinch, software figures out basic areas to pinch User can then add additional manual pinch controls User can then add additional manual pinch controls
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Shell Example
w/out pinch feature w/pinch feature
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Shell Example
w/out pinch feature w/pinch feature
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Solid Example
w/out pinch feature w/pinch feature
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Advanced Size Function
Incorporate FLUENT size function Curvature based sizing controls Proximity based sizing controlsy g Body/Face/Edge sizing Improve consistency of controls across meshImprove consistency of controls across mesh
methods
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Advanced Size Function
Advanced size functions added for explicit control for: Curvature Normal Angle Number of cells in a thin gap Minimum Size
Maximum Face Size Maximum Face Size Maximum Tet Size Growth RateGrowth Rate
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Advanced Size Function
Standard Size Function
Advanced Size Function
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Advanced Size Function
Standard Size Function
Advanced Size Function
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Advanced Size Function
Standard Size Function Advanced Size Function
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Advanced Size Function
With curvature
With t d i it (5 ll i ) With curvature and proximity (5 cells in gap)
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Scoped Sizes
Scoped size controls:Scoped size controls: Edge
Face Face Body
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Body of Influence
Bodies can be used to define a region ofBodies can be used to define a region of influence
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Interface/Contact Modeling of Parts
There are several techniques to model the common faces between parts As parts As multibody part with
common nodes As multibody part with
duplicated nodes Shared/matched face(s) Shared/matched edge(s)
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Interface/Contact Modeling of Parts
There are several techniques to model the qcommon faces between parts As parts 2 facesp As multibody part with
common nodes 1 face As multibody part with
duplicated nodes 2 faces Shared/matched face(s) Shared/matched edge(s)
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Interface/Contact Modeling of Parts
As Parts: 2 Faces at contact region2 Faces at contact region Parts meshed separately
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Interface/Contact Modeling of Parts
As Multibody part:No contacts since parts No contacts, since parts share common faceMultibody part meshed Multibody part meshed as a whole
DM Attribute
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Interface/Contact Modeling of Parts
As Multibody part (w/Imprints):y p ( p ) Contacts, since each body
has a face Multibody part meshed as a
wholeDM Attribute
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Interface/Contact Modeling of Parts
Depending on how the user wants the interface p gmodeled/meshed between two bodies, user can choose appropriate optionU i th i i t ti i ltib d t Using the imprint option in a multibody part ensures a common interface between 2 parts
If using Imprint option there are a few controls toIf using Imprint option, there are a few controls to keep in mind: Contact sizingg Match control: Arbitrary Patch independent option:
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Match mesh where possible
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Interface/Contact Modeling of Parts
Contact SizingDrag and Drop Contact Region into Mesh folder Drag and Drop Contact Region into Mesh folder
Influences the mesh sizing between parts
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Mesh isnt always coincident
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Interface/Contact Modeling of Parts
Match Control: Arbitraryy Enforces same node spacing based off
common topology between partsp gy p
Undesired penetration of Desired coincident nodes individual parts with multi-body part using
IMPRINT method and M h lMatch control
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Interface/Contact Modeling of Parts
Patch Independent option: Match mesh where p ppossible If yes software will try to enforce common y y
nodes between common faces of a multibody(imprint) part
If no software will not try to enforce common nodes b t f fbetween common faces of a multibody(imprint) part
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Meshing Meshing Meshing Improvements
Meshing Improvements
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Surface Meshing
Improved surface mesh quality Eliminate poor-quality mesh clusters Improved curvature based refinement controls
2D inflation controls 2D Planar models Shell models
Respect new sizing controls Improved auto-blocker robustness/consistency
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Meshing Update
More uniform surface mesh:More uniform surface mesh:ANSYS 11.0 ANSYS 12.0
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Meshing Update
More uniform surface mesh:More uniform surface mesh:ANSYS 11.0 ANSYS 12.0
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Meshing Update
More uniform surface mesh:More uniform surface mesh:
ANSYS 12 0ANSYS 12.0ANSYS 11.0
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2D Inflation Controls
2D planar model2D planar model
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2D Inflation Controls
2D shell model
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Tetrahedral Meshing
Mix and Match Tetrahedral and Sweep methods TGrid Tetra AFT meshing method for CFD Improved patch independent robustnessp p p Improved consistency of controls
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Combination of Methods
Mapped bodies
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Tetrahedral Meshing
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ANSYS 11.0 ANSYS 12.0
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Inflation
Multibody part handling Smooth transition Collision avoidance
St i t i Stair-stepping Layer compression Examples
Preview inflation Pre vs. post inflation
S Sweeping Pure hex or wedge
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Inflation: Multibody Parts
Mapped bodies
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Smooth Transition
Smooth transition option added to provide layer by layer smoothing to achieve good transition to tetmesh
Transition ratio controls inflation to tet transitionTransition ratio controls inflation to tet transitionCFX Default FLUENT Default
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Inflation: Stair-stepping vs. Compressionp
Layer Compression Stair-stepping
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Inflation: Stair-stepping vs. Compressionp
Layer Compression Stair-stepping
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Examples of Inflation
There are situations when stair-stepping is locally taking place altho gh compression as req estedtaking place, although compression was requested
Between multi-body parts
Local stair-stepping
Resolve by adding
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inflation on interior faces
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Examples of Inflation
There are situations when stair-stepping is locally taking place altho gh compression as req estedtaking place, although compression was requested
In Sharp Corners
Local stair-stepping
Resolve by rounding the
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sharp edge
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Preview Inflation
Inflation preview added to help identify possible problems with inflationproblems with inflation
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Inflation on Swept Bodies
Swept method requirements for inflation The swept method must be assigned to the body
Similar bodies can be assigned in one control
Source face has to be assigned to the swept bodySource face has to be assigned to the swept body Inflation The inflation is assigned to a Face with corresponding g p g
edges as Boundaries The Face must be the source face of the swept
methodmethod First and Total height algorithms are available
Smooth transition is not available
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Inflation on Swept Bodies
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Hex Meshing
In Workbench there are several methods for hex meshing: Default Sweep Thin Sweep Hex Dominant MultiZone
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Hex Meshing Improvements
ANSYS 12.0 brings the following improvements Default Sweep
Improved inflation More control over mesh type: quad, quad/tri, tri
Thin Sweep Support for body level (multibody parts) Multiple elements through thickness for parts
MultiZone New option that extends all hex or hex dominant
meshing to more complex parts
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meshing to more complex parts
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Sweep: Inflation
Inflation with sweeping generates a hex mesh
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Sweep: Face Mesh Type
Option for free face mesh type in sweep
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Thin Solid Sweep Meshing
Improved robustnessp Works at body level with other methods
ThinThin Sweep
General Sweep
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Thin Solid Sweep Meshing
Multiple elements through thicknessf i l b d tfor single body parts
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Thin Solid Sweep Meshing
Multibody part meshing
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Swept Meshing: MultiZone
MultiZone sweep meshingp g Automatic geometry decomposition Multiple/single source/targetMultiple/single source/target Mapped/Free meshing InflationInflation
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MultiZone
Automatic geometry decomposition With the sweep method, this part would have to be sliced into 5
bodies to get a pure hex mesh
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MultiZone
Automatic geometry decomposition With MultiZone, this can be meshed with pure hex mesh without
any geometry decomposition.
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MultiZone
Multiple source imprinting Imprints from multiple sources and cross sections can be swept
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MultiZone
Multi-source/multi-directional imprinting
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MultiZone
Multibody part handlingMultibody part handling Multiple parts are meshed with conformal mesh at shared interface.
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MultiZone: Multiple Zones
Free decompositionFree decomposition Face topology is used to construct solid regions or blocks.
Each block can be swept independently provided the mesh is conformalconformal.
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MultiZone: Free Decomposition
Using Free Mesh Type, MultiZone can be used to get a hex mesh where possible, and free mesh everywhere else, without slicing.
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MultiZone: Free Decomposition
MultiZone unstructured/free regions can be filled with:
Free Mesh Type = Tetra
Free Mesh Type = Hexa Dominant
Free Mesh Type = Hexa Core
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MultiZone with Inflation
MultiZone with inflation
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MultiZone with Inflation
MultiZone with inflation and free blocks
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Mesh Metrics
Mesh metrics added Mesh level, part level and body level
W t l t di l Worst element display
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Performance & Data-Integration Improvementsp
Performance Improvements Multibody part mesh memory utilization & speed
improvedG l d ti d d i t General memory reduction and speed improvements
Improved Data-IntegrationN d S l ti t d t ACMO f i CFX P Named Selections stored to ACMO for use in CFX-Pre
Fluent output improved CGNS output addedCGNS output added Write ICEM CFD Files option for easier transfer to
ANSYS ICEM CFD
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