ANSYS12 Meshing Features

12.0/12.1

© 2009 ANSYS, Inc. Inc. All rights reserved. reserved.

1

ANSYS, Inc. Proprietary

A N SY SY S M e s h i n g nt ro uc t on


2


A N SY SY S M e s h i n g nt ro uc t on


2


M e s h i n g Ov e r v i e w • ANSYS Workbench process automation

– Physics-aware meshing – Meshing in batch – arametr c ers stent mes ng • Adding controls for meshing flexibility

– – – – –

mesh sizing mesh ali nment mesh quality mesh feature capturing


3


Pr o c e s s A u t o m a t i o n

• Mesh Meshin in com comes as a cel celll of of a Work Workbe benc nch h Ana Anall sis sis System (Mesh/Model) • Or as it’s 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

– Downstream systems can be linked to the Mesh cell of any system © 2009 ANSYS, Inc. Inc. All rights reserved. reserved.

4


P h y s i c s -A -A w a r e M e s h i n g

• There There are four four h sics sics refere reference nces s in the Meshi Meshin n application, each using appropriate defaults for that physics


5


M e sh s h i ng ng i n B at c h • 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. mesh you can Edit it to view the mesh or add a ona co con ro ro .


6


Pa r a m e t r i c /Pe r s i s t e n t M e s h i n g • In the following slides, we will see how mesh methods and mesh controls can be inserted to control the properties of the mesh. •

.

• 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 • This makes parametric/persistent meshing inherent to the rocess

© 2009 ANSYS, Inc. All rights reserved.

7


A d d i n g Co n t r o l s f o r Fl e x i b i l i t y • As demonstrated, Meshing in Workbench is designed to be invisible to the user • However, since a well controlled mesh is often required , great deal of flexibility to control:

– – – – –

mesh type/method mesh sizing mesh alignment mesh quality mesh feature capturing


8


A d d i n g M e s h Co n t r o l s • Let’s look at an assembly model: • You can see in this case that Workbench automatically ass gns:

Contact is automatically defined between parts

• Physics based sizing

Mesh object: additional controls can be inserted

between parts • User can go into these defaults and adjust as they see fit.

Global controls: Physics preferences, , , .


9


A d d i n g M e s h Co n t r o l s • Mesh Methods:

• Parts are meshed as appropr a e, ex w ere possible, else tets • User can insert mesh defaults.

Some parts are meshed with patch conforming tetrahedral method

Some parts are meshed with general sweep


10


A d d i n g M e s h Co n t r o l s • Mesh Controls (Virtual Topology): • Geometry and mesh defeaturing tools are available to reduce the e emen ce coun n noncritical regions • Manual virtual topologies

Let’s see how we can coarsen mesh in non-critical regions

features to capture Virtual Topologies can be created automatically, or manually as shown here.

Mesh walks over details

Mesh is refined to respect each face © 2009 ANSYS, Inc. All rights reserved.

11


A d d i n g M e s h Co n t r o l s • Mesh Controls (Auto VT): • Automatic virtual topologies can be created and then user can edit these manually or op mum con ro

Mesh without

Mesh after automatic Virtual Topologies

Automatic Virtual Topologies © 2009 ANSYS, Inc. All rights reserved.

12


A d d i n g M e s h Co n t r o l s • Sizing controls are available at the body, face, edge, and vertex level

• Mesh Controls (Sizing):

• Other sizing controls include: • Sphere of influence • Body of influence • Curvature/Proximity sizing Now let’s apply a body sizing to improve uniformity of mesh

Insert body sizin , cross hatch represents size

Resulting mesh


13


A d d i n g M e s h Co n t r o l s • If Virtual Topologies (VTs) aren’t enough for geometry , can further simplify the model

• Mesh Controls (Pinch):

• The pinch controls use mesh based defeaturing and can be applied manually or automatically like VTs.

Notice bad mesh in areas

Insert manual pinch controls to remove unwanted features © 2009 ANSYS, Inc. All rights reserved.

14

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


A d d i n g M e s h Co n t r o l s • Mesh Control (Mapped Face):

e ace mesh structure can be Select changed face(s) to by adding havemapped a mapped face mesh controls


Since the face has a cutout, sub-mapping is done to get a mapped mesh

Face is meshed with mapped quads split to tris

15


A d d i n g M e s h Co n t r o l s • Mesh Methods and Controls:

• This example shows how and methods can combine to provide great flexibility

Add Virtual Faces to aid in hex meshing

Default tet mesh Hex mesh would improve solution accuracy

Pure hex mesh is a e o e generated

Add MultiZone method for pure hex mesh


16


A d d i n g M e s h Co n t r o l s • Mesh Methods and Controls: • There is an extensive list of additional mesh methods/controls, but this Apply body sizing with smaller mesh size

the use of these controls.

Refined hex mesh for better accuracy

Section plane of hex mesh


17


A d d i n g Co n t r o l s f o r Fl e x i b i l i t y • The controls that were added are stored as objects in the mesh folder

•

– 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.


18


A N SY S M e s h i n g 1 2 .0 Fe a t u r e U p d a t e


19


A N SY S 1 2 . 0 M e s h i n g Go a l s • Next generation solution for GAMBIT and CFXMesh customers: – Follows Workbench guiding principles: , , , Flexible, Physics-aware, Adaptive Architecture • Inte ration 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,


20


M e s h Co n t r o l s • Physics-based mesh controls • Support for CAD instances • Arbitrary mesh matching • – Corner controls to help define mapping strategy

• Pinch feature • Advanced Size Functions • Interface/contact handling between parts

– – Arbitrary mesh matching – Patch independent option: Match mesh where poss


e

21


Fl u i d s Ph y s i c s -b a s e d M e s h Co n t r o l s • ANSYS 12.0 is the first release targeting CFD needs using our proven GAMBIT and TGrid meshing technology • Better CFD meshing defaults: – Automated CFD meshing process •

uen s ape c ec con ro s

– Support for FLUENT boundary conditions, mesh size functions, etc.

– Improved inflation controls • Program controlled inflation •

moot trans t on contro s


22


CFD Me sh in g • Automated CFD meshing process: – CFX/FLUENT solver preference added to tailor mesh based off solver

– e appropr a e e au s – Added “Skewness” quality metric for FLUENT


23


CFD Me sh in g • 3D Bodies (Zones) Solid/Fluid: –

– Display of Solid/Fluid indicates type – FLUENT will use this for 3D Zone creation

• 2D Zones – Named Selections (for Boundary Conditions) pass through Workflow (CADGeometryMeshingFLUENT) © 2009 ANSYS, Inc. All rights reserved.

24


I m p r o v e d CFD I n f l a t i o n • Program Controlled Inflation – – Or user can inflate off a named selection, or insert inflation control


25


St r u c t u r a l Ph y s i c s -B a s e d M e s h Co n t r o l s • Efficient meshing for physics

– Rigid body contact meshing • Edges/Faces in contact area are only things meshed • Centroid defined for mass

–

as e mes ng • Quadratic edges/faces on top and bottom


26


Ri g i d B o d y M e s h i n g (3 D) • Only faces of rigid body in contact get meshed


27


Ri g i d B o d y M e s h i n g (2 D) • Only edges of rigid sheet in contact get meshed


28


Ga s k e t El e m e n t s • More automated way of meshing gaskets

Linear faces on sides © 2009 ANSYS, Inc. All rights reserved.

29


Su p p o r t f o r CA D I n s t a n c e s • Instances defined in Pro/E, Solidworks, etc. are used in meshing (geometry/mesh is copied) – Geometry transfer/meshing speedup

• Selection by instance


30


M e s h in g of I n s t a n c e s

• –

58% time reduction in meshing

•


Instance selection:

31


M e s h in g of I n s t a n c e s

• – – –

Geometry transfer: 77% time reduction Meshing speedup: 55% time reduction o a mpor an mes ng o s mo e re uce 533 to 192 seconds (64% time reduction)


32

rom


A r b i t r a r y Me s h M a t c h i n g

• based off 2 coordinate systems


33


I m p r o v e d M a p p ed e d Co Co n t r o l

• controls to define strategy for submapping


34


P i n c h Fe Fe a t u r e

• Mesh Mesh inch inch out out featur feature e added added for defeat defeaturi urin n at mesh mesh level level • Automated based off shell thickness or user defined tolerance • Works in conjunction with Virtual Topologies to simplify meshing constraints


35


A u t o m a t i c P i n c h G e n er er a t i o n • With automatic pinch generation user can pinch features under a defined size and remove small features from the mesh

thickness, or define a tolerance


36


M a n u a l Pi n c h Fe a t u r e

• With Auto-pinch, software figures out basic areas to pinch


37


Sh e l l Ex a m p l e

w/out pinch feature


w/pinch feature

38


Sh e l l Ex a m p l e

w/pinch feature

w/out pinch feature


39


So l i d Ex a m p l e

w/pinch feature

w/out pinch feature


40


A d v a n c e d Si ze Fu n c t i o n • Incorporate FLUENT size function • Curvature based sizing controls • Proximit based sizin controls • Body/Face/Edge sizing • Im rove consistenc of controls across mesh methods


41


A d v a n c e d Si ze Fu n c t i o n • Advanced size functions added for explicit control for: – – – – – –

Curvature Normal Angle Number of cells in a thin gap Minimum Size ax mum ace

ze

Maximum Tet Size


42


A d v a n c e d Si S i ze z e Fu Fu n c t i o n • Standard Size Function • Advanced Size Function


43




44




45


A d v a n c e d Si ze Fu n c t i o n • With curvature

•


curva ure an prox m y

46

ce s n gap


Sc o p e d Si ze s

• – Edge – – Body


47


B o d y o f I n f l ue n c e

• influence


48


I n t e r f a c e /Co n t a c t M o d e l i n g o f Pa r t s

• 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)


49



• There are several techni ues to model the common faces between parts 2 faces

– As parts – As multibody part with common nodes

1 face

– As multibody part with duplicated nodes

2 faces

• Shared/matched face(s) • Shared/matched edge(s)


50



• As Parts:

– – Parts meshed separately


51



• As Multibody part:

–

, share common face

– as a whole DM Attribute


52



• As Multibod

art w/Im rints :

– Contacts, since each body has a face

– Multibody part meshed as a whole DM Attribute


53



• Depending on how the user wants the interface modeled/meshed between two bodies, user can choose appropriate option • s ng e mpr n op on n a mu o y par ensures a common interface between 2 parts • , keep in mind: – Contact sizing – Match control: Arbitrary – Patch independent option: Match mesh where possible © 2009 ANSYS, Inc. All rights reserved.

54



• Contact Sizing – – Influences the mesh sizing between parts

Mesh isn’t always coincident © 2009 ANSYS, Inc. All rights reserved.

55



• Match Control: Arbitrar

– Enforces same node spacing based off common topology between parts Undesired penetration of individual parts


Desired coincident nodes with multi-body part using IMPRINT method and atc contro

56



• Patch Inde endent o tion: Match mesh where possible

– If “yes” software will try to enforce common nodes between common faces of a multibody(imprint) part

– If “no” software will not try to enforce common nodes e ween common aces o a multibody(imprint) part


57


Improvements


58


Su r f a c e M e s h i n g • 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


59


M e s h in g U p d a t e

ANSYS 11.0


ANSYS 12.0

60



ANSYS 11.0


ANSYS 12.0

61



. ANSYS 11.0


62


2 D I n f l a t i o n Co n t r o l s

•


63


2 D I n f l a t i o n Co n t r o l s • 2D shell model


64


Tet rahedral Meshing • Mix and Match Tetrahedral and Sweep methods • TGrid Tetra AFT meshing method for CFD • Im roved atch inde endent robustness • Improved consistency of controls


65


Co m b i n at i o n o f M e t h o d s Mapped bodies


66


Tet rahedral Meshing

ANSYS 12.0

ANSYS 11.0 © 2009 ANSYS, Inc. All rights reserved.

67


Inflation • Multibody part handling • Smooth transition • Collision avoidance a r-s epp ng – – Layer compression – Examples

• Preview inflation • Pre vs. post inflation • Sweeping – Pure hex or wedge


68


I n f l a t i o n : M u l t i b o dy Pa r t s Mapped bodies


69


Sm o o t h Tr a n s it i o n • Smooth transition option added to provide layer by layer smoothing to achieve good transition to tet mesh • CFX Default


FLUENT Default

70


I n f l a t i o n : St a i r -s t e p p i n g v s . Compression

Layer Compression


Stair-stepping

71


I n f l a t i o n : St a i r -s t e p p i n g v s . Compression

Layer Compression


Stair-stepping

72


Ex a m p l e s of I n f l at i o n • There are situations when stair-stepping is locally , u w u Between multi-body parts Local stair-stepping

Resolve by adding inflation on interior faces © 2009 ANSYS, Inc. All rights reserved.

73


Ex a m p l e s of I n f l at i o n • There are situations when stair-stepping is locally , u w u In Sharp Corners Local stair-stepping

Resolve by rounding the sharp edge © 2009 ANSYS, Inc. All rights reserved.

74


Pr e v i ew I n f l a t i o n • Inflation preview added to help identify possible


75


I n f l at i o n o n Sw e p t B o d ie s • Swept method requirements for inflation

– The swept method must be assigned to the body • Similar bodies can be assigned in one control

– • Inflation – The inflation is assi ned to a Face with corres ondin edges as Boundaries

– The Face must be the source face of the swept – First and Total height algorithms are available • Smooth transition is not available


76


I n f l at i o n o n Sw e p t B o d ie s


77


H e x M e s h in g • In Workbench there are several methods for hex meshing:

– Default Sweep – Thin Sweep – Hex Dominant – MultiZone


78


H e x M e sh i ng I m p r ov e m e n t s • 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


79


Sw e e p : I n f l at i o n • Inflation with sweeping generates a hex mesh


80


Sw e e p : Fa c e M e s h T y p e • Option for free face mesh type in sweep


81


T h i n So l i d Sw e e p M e s h i n g

• Im roved robustness • Works at body level with other methods n Sweep

General Sweep


82



• Multiple elements through thickness or s ng e o y par s


83



• Multibody part meshing


84


Sw e p t M e s h in g : M u l t i Z o n e

• MultiZone swee meshin – Automatic geometry decomposition – – Mapped/Free meshing –


85


MultiZone • Automatic geometry decomposition – With the sweep method, this part would have to be sliced into 5 bodies to get a pure hex mesh


86


MultiZone • Automatic geometry decomposition – With MultiZone, this can be meshed with pure hex mesh without any geometry decomposition.


87


MultiZone • Multiple source imprinting – Imprints from multiple sources and cross sections can be swept


88


MultiZone • Multi-source/multi-directional imprinting


89


MultiZone

• – Multiple parts are meshed with conformal mesh at shared interface.


90


Mult iZone: Mult iple Zones

• – Face topology is used to construct solid regions or blocks. Each block can be swept independently provided the mesh is .


91


M u l t i Z o n e : Fr e e De c o m p o s i t i o n • Using Free Mesh Type, MultiZone can be used to get a hex mesh where possible, and free mesh everywhere else, without slicing.


92


M u l t i Z o n e : Fr e e De c o m p o s i t i o n • MultiZone unstructured/free regions can be filled with:

Free Mesh Type = Tetra Free Mesh Type = Hexa Dominant Free Mesh Type = Hexa Core


93


Mult i Zone w it h I nflat ion • MultiZone with inflation


94


Mult i Zone w it h I nflat ion • MultiZone with inflation and free blocks


95


M e sh Me t r i c s • Mesh metrics added – Mesh level, part level and body level

•

ors e emen


sp ay

96


Pe r f o r m a n c e & Da t a -I n t e g r a t i o n Improvements

• Performance Improvements – Multibody part mesh memory utilization & speed improved

–

enera memory re uc on an spee

mprovemen s

• Improved Data-Integration – ame e ec ons s ore o or use n - re – Fluent output improved – – Write ICEM CFD Files option for easier transfer to ANSYS ICEM CFD


97


A N SY S Wo r k b e n c h . Fe a t u r e U p d a t e

New at . © 2009 ANSYS, Inc. All rights reserved.

98


A N SY S 1 2 . 1 M e s h i n g Go a l s • Linux support • Improve robustness and usability of 12.0:

– Es eciall as it is related to GAMBIT and CFXMesh user migration


99


A N SY S 1 2 .1 M e s h i n g A d v a n c e s Meshing Framework Improvements

s ►Journaling at project level n a l

Export geometry facets to TGrid

►

g ►Mesh metric graphs n ►Numbering controls i

Improved Named Selections

►

Program Controlled inflation

►

Overlap handling

s ►Mixed order meshing e M . 2 ►MultiZone Improvements 1

►

Post inflation improvements

►

Body-Fit Cartesian Method (beta)

►

Sweep Improvements

► ►

ac

n epen en mprovemen s


Support for 0-thickness walls

►

100

12.1 ANSYS, Inc. Proprietary

Meshing Improvements


101


L i n u x Su p p o r t Supported Platforms: ►SLES10-64 ►RHEL5-64

New at .

N S Y

Supported Connections: ►DesignModeler

1 2 .1

CFX

►

Fluent

►

Mechanical APDL

►

CAD Connections: Parasolid, ACIS, IGES, STEP, UG NX5 and NX6 on SLES10-64 on y

►


102


J o u r n a l i n g a n d Sc r i p t i n g Framework level scripting:

New at .

generated for framework level commands , be generated in batch

A N S S 1 2 .


103


Su p p o r t f o r 0 -t h i c k n e s s (b a f f l e ) w a l l s 0-thickness walls

New at .

Tetrahedral mesh methods:

►

Patch conforming

►

A N Inflation can be grown off 0-thickness S walls: S ►Stair-stepped at boundaries 1 2 ►Program controlled inflation works . similar to other walls. Patch independent

►


104


Po ly fl ow i nt e g ra t i on Support for Polyflow

Parameterized

New at .

CAD/DMAMPolyflow CFD-Post

►

Automatic Meshing

A N S

now possible

Polyflow specific mesh controls ►Mesh relevance and sizing ►Mesh export in *.poly format

S 1 2 .

Pol flow

Support for legacy Polyflow meshes. ►Legacy Polyflow meshes (*.msh, *. , *. Mesh cells in Workbench © 2009 ANSYS, Inc. All rights reserved.

105


Ex p o r t g e o m e t r y f ac e t s t o T Gr i d New workflow:

New at . TGridFluent

Access to TGrid wrapper and new

►

Naming conventions ►TGrid Faceted geometry (*.tgf) file ►Part-body names preserved Named selections preserved

►

ustom ze so ut ons eta : ►Batch conversion of many CAD files ►Supporting CAD readers


106

A N S S 1 2 .


I m p r ov e m e n t s in


107


M e s h M e t r i c Gr a p h New at .

Outline

Automatic display upon meshing (including preview)

►

upports a es etr cs and standard element types

►

Number of Elements or Percentage of Total

►

um er o

ars; up a e

A N S S 1 2 .

X-axis; Min/Max/Reset

►

Y-axis; Min/Max/Reset

►

Element type activation

► ► © 2009 ANSYS, Inc. All rights reserved.

108

x to Return ANSYS, Inc. Proprietary

Fi n d i n g l oc a t i o n o f ba d c e l l s Controls:

New at .

depending on metrics Update Y-axis

► ►

ccept t e c anges

Display: ► ar w e up a e ►Left click on a bar; 1. Elements are highlighted Model turns transparent 2. ►Ctrl-click to add bars tooltip with exact X and Y values © 2009 ANSYS, Inc. All rights reserved.

109

N S Y 1 2 .1


N u m b e r i n g Co n t r o l s Mesh Numbering branch:

New at .

Allows user to control element or node numbering or offset

►

Body scoping: ►Specify element or node number range for the body

Vertex scoping: ►Specify node number of a mounting oint, etc.


110

A N S S 1 2 .


M i x e d Or d e r M e s h i n g Support for multibody parts New at For example: . ►Linear Hex defined on sweep control

►

N S Y 1 2 .1

Quadratic Tets

►

defined by global controls

►

attached to quadratic pyramids Shared face at boundary have midnodes

►

Mixed order elements will be displayed in quadratic element type mesh metric column

►


111


I m p r o v e d V i r t u a l T op o l o g y Virtual Topology Option:

New at .

Virtual topologies are faceted representations of the original . projection is to the facets. Improved projection can be obtained by projecting back to the underlying geome ry.

►

Improved faceting of VTs: ►Improved underlying representation of VTs for greater robustness Im roved ma

►


112

N S Y 1 2 .1

ed mesh on VTs


N a m e d Se l e c t i o n En h an c e m e n t s Find overlapping Named Selections ►Exporting the mesh/faceted geometry with overlapping 12.1 named selection is not allowed and produces an error A ►To find: Mesh  right-click “Show N S Geometry in overlapping Named Y selection” S Exclude Named selection from 1 2 Program Controlled inflation .1 ►When new Named Selections are added they often break Program Controlled inflation ou can choose if the Named ►Now Selection should be part of Program Controlled inflation or not © 2009 ANSYS, Inc. All rights reserved.

113


Po s t i n f l at i o n i m p r o ve m e n t s Support for transition ratio:

New at .

growth transition from prism layers to tets

N S Y S Better support for layer compression: 1 2 ►Improved robustness for post inflation .1 with la er com ression o tion Also with 0-thickness models

►


114


I m p r ov e m e n t s in


115


M ul t i Z o ne I m p ro ve m e n t s Revolved model improvements:

New at .

Better robustness and smoothness

►

Im rovements in ro ections: ►Helix models supported ►Better robustness for cases having Improvements in multibody parts: ►Better robustness ►Better side face handling

A N S S 1 2 .

Im rovements in inflation: ►Better robustness © 2009 ANSYS, Inc. All rights reserved.

116


Sw e ep I m p r ov em e nt s Sweep Method:

New at .

Better support for sphere source faces

►

Thin Sweep Method: ►Improved robustness for thicker models and variable thickness Better error handling: ►Improved conflict error handling for scoped sizing controls with mapped mesh ►Improved highlighting of problem areas in Sweep and Thin solid sweep © 2009 ANSYS, Inc. All rights reserved.

117

N S Y S 1 2 .1


Pa t c h I n de p en d en t I m p r o ve m e n t s Behavior option support:

New at .

Ability to locally turn off curvature/proximity refinement

►

Improved Robustness: ►Out of memory errors for patch independent added ►Im roved handlin of com licated geometries


118

N S Y 1 2 .1


I m p r o ve d sm o o t h i n g For Physics = CFD with

New at .

inflation: ►Setting Smoothing to HIGH tries to above 0.9

A N S S 1 2 .

Exam le: Port valve in 12.1 ►Smoothing = Medium (default) Worst skewness = 0.962

►

Worst skewness = 0.897

►


119


ANSYS12 Meshing Features

Recommend Documents