Fluent Meshing 16.0 Preview 4 -...

© 2014 ANSYS, Inc. September 19, 2014 1

Fluent Meshing 16.0 Preview 4


R16 Highlights

Usability/Workflow

Performance/Robustness

New Features

• Improved interface

• Graphic tools

• Surface meshing/repair

• Workflows


Workflow

• Improved CAD import options – Minor Changes to CAD Import panel

– Simplified CAD Options panel

• Only important options remained

– Object Creation

• Increased flexibility in Object and Zone granularity

– All combinations are supported

– New terminologies

• Selecting CAD Faceting will result in Geometry Objects upon import

• Selecting CFD Surface Mesh will result in Mesh Objects upon import

R16 R15


Workflow

• Exporting from SpaceClaim to Fluent Meshing • Checklist for STL export

– Save As STL

– Export options

• File

– For multi-assembly – “Per component”

– For single assembly – “Per body”

• Resolution; Custom

– Deviation : use 1/10 of min-size

– Angle : ~ ½ of expected curvature angle

– Facet Maximum edge length : ~Max size

• This will create one STL per body/part

– Fluent Meshing stl import

• File > Import > CAD…

– Multiple file read option

– Pattern: *stl

– One Object per file


Workflow

• STL import from SpaceClaim • Good quality conformal faceting

• Often results in zero free faces

SpaceClaim Fluent Meshing


Model tree


Usability

• Improved interface : Model Tree • Overview

– Model

• Access to meshing utilities

– Geometry Objects

• Note that wrap objects was unified with mesh objects

– Mesh Objects

• Face Zone Labels

– Represents original cad/face zones

• Volumetric Regions

– Essentially the same as Domains

• Cell zones

– Manage your cell zones from the tree

– Unreferenced

• These are entities that do not belong to any objects


Usability

• Context Menu: – Construction Geometry

• Note that all construction tools can be accessible from Boundary-> Create

– Sizing • Scoped Sizing– New option

• Size Function

– Material Points

– Periodicity – New option • For Size function, wrapper,

prisms, etc.

– Groups

– Object Management • Opens the “Manage Objects” panel

– Prepare for solve • Previously denoted “Cleanup”

• Deletes all objects, removes post-fix, renames , etc..


Improved Workflow

• Advantages

Scoped sizing vs. Size Function

• Scoped to Objects or Zones

• Using Object Filters, wildcards or individual selections

– Wildcards allow for easy re-use on new model

• Read and Write Controls or use TUI commands for scripting

• Assigned to Zones

• Individual selections only – Only workaround through groups

– Wildcard only in customized TUI

• TUI command support only


Improved Workflow

• Creating Size Fields using Scoped Sizing • Access to global and local sizing controls

• Can be scoped to

– Objects or Zones

– Mesh, geometry or un-referenced object types

– Wildcard strings or selections

• Option to create, modify, delete, draw, list, write or read scoped sizing

• Compute or delete size fields

• Invoke size field filters


Improved Workflow

• Size estimation and visualization

• Use a Preview tool to estimate local min and max

• Ctrl-t + Ctrl-p for accessing the preview size panel

• Ability to visualize size field on selected zones

• Ctrl-t + Ctrl-c to display the size contours

Ctrl-y for size probing


Usability

• Create Periodicity

• Periodicity is used to create (recover) matching periodic meshes after meshing

• It is accessible from Model tree, Scoped sizing and Size Function

• By defining Periodicity, periodic Size function and re-projection of periodic zones during wrapping are also invoked

– Input the Pivot and Axis for the periodic coordinate system or Use Define and 6 points to define the periodicity

1 2 3

4 5 6


Usability

• Context Menu: • Geometry Objects - header

– Draw all – Select all

• ..individual objects in the tree

• Geometry Objects – individual – Draw

• To draw the full model

– Draw options • Add/remove/select from Graphics

– List Selection • Transfer selections from Tree to

open Panels

– Diagnostics • Geometry (on Objects) • Connectivity and Quality (on Zones)

– Merge • Note: cannot merge walls of different objects

– Rename/Change property • Rename has been expanded to

include property management


Usability

• Context Menu: • Geometry Objects - individual

– Delete • Objects

– Optionally including Faces and Edges

– Convert to mesh objects

– Wrap • Sub menu with the common

operations needed prior to wrapping

– Remesh • Will create mesh objects

– Advanced

• Extract edges

• Create intersection loops

– Summary

• Diagnostics connectivity and quality summary

– Info

• Cell zone type, priority, face zones and edges zones


Usability

• Context Menu: • Mesh Objects – individual

• Many common operations with Geometry Objects, with a few exceptions

– Join/intersect…

• Starting point for Build Topology

– Recover periodic

• Linked to the periodicity definition

– Auto Mesh

– Advanced

• Remove Gaps

• Sew (global)

• Extract edges

• Intersection loops creation

– Check Mesh

• Same as in Fluent


Usability

• Context Menu: • Unreferenced

⁻ Entities not belonging to any objects

• Unreferenced – heading

⁻ Draw, Draw option, List Selection and Info

⁻ Same as in Objects

⁻ Create New Objects

⁻ Open the Create object form

⁻ Sub-set of functionalities from Object Manage panel

⁻ Can also be accessed from

⁻ Delete All

• Unreferenced – individuals

⁻ Example using Cell Zones


R16 Highlights

Usability/Workflow


New Features


• Graphic tools

• Surface meshing/Workflow

• Volume meshing


Tool- tip information is displayed at the top of the screen

Short-cut icons and miscellaneous tools


Usability

• Icons for shortcuts • Help in top left corner

• Entity Selection filter and common display options

• Utility functions

• Entity operations on the bottom

⁻ Exposure of Icons will change depending on selected entities

Entities Selection : Position - Ctrl-x

Point - Ctrl-p

Edge - Ctrl-e

Face - Ctrl-f

Zone - selected - Ctrl-z

Object - Ctrl-b

Edge selection mode - Ctrl-Shift-z Show Mesh - Ctrl-Shift-e

Show all - Ctrl-Shift-a

Clear All - F2

Example: Entities Operation for Zones: Information - Ctrl-i Hide - Ctrl-shift-h

Isolate - Ctrl-shift-i

Undo - Ctrl-shift-u

Rename - Ctrl-shift-n

Smooth - F6

Repair - Ctrl-r

Remesh - Ctrl-shift-r

Separate - Ctrl-shift-s

Merge - Ctrl-shift-h

Feature capture - Ctrl-shift-f

Yank zone - Ctrl-shift-y

Set as Target - Ctrl-s

Delete - Ctrl-w

Selection options View operations Examine options Loop/Cap creation


• Improvement to Part Management

• Move zones into Objects using yank (Ctrl-shift-y)

– You can transfer zones from one or several objects into

• One existing object, or

• A new object where the object name can be changed

• Any empty object will be automatically deleted

• Change Zone Name/ Property (Ctrl-Shift-n)

– Ability to assign

• Zone Name

• Boundary type

• Wrapper recovery type

Improved Workflow


Improved Feature

• Several options of graphics (zone based) re-meshing (Ctrl-Shift-r) • Sizing assignment using

– Size Field

• Feature angle access

– Constant size

• Preview


Usability

• Icons for graphic short-cuts • Selection, display and examine options


Usability

• Icons for graphic shortcuts

• Selection options

• View operations

• Examine options

• Loop/Cap Creation

View operations

Similar surface area (Ctrl-Shift-d+ Ctrl-s)

Similar curvature (Ctrl-Shift-d+ Ctrl-c)

Examine operations

Explode (Ctrl-Shift-x) Centroid (Ctrl-l)

Transparent (Ctrl-Shift-t) SF Size (Ctrl-y)

Distance (Ctrl-d)

Create Loop (Ctrl-Shift-l)

Create Loop Options

Selection options

Location (F4) Visible (Ctrl-Shift-v)

Box Previous (Ctrl _ )

Polygon (F4) Deselect last (Esc)


Improved Workflow • Improvements to Capping/Patching

• Adding a patch to an Object

• Speed-up loop creation

– Following features instead of shortest path

• Patch creation

– Robustness

– Node-merge


Improved Workflow • Improvements to Capping

• Using fewer points in patch creation

– By default the loop is following the shortest path

– The loop can optionally following the feature instead

• Capping robustness

– Handling more complex patches

Default behavior

New option

2

3

4


Improved Workflow

• Improvements to capping • Object management

– Set Object before capping (object turns red)

– Create the loop around the opening

– The capped zone is added to the Object

– Node merge is automatically invoked


New Repair feature

• Fill “punched’ holes • All holes/openings in bodies with a conformal mesh/faceting are being

automatically capped

• Workflow – Pick a face and Repair

• Behaviour based on Caps settings – Available through Display -> Controls


New Mark feature

• Marking tool (Ctrl-Shift-j) • Can be used to accumulate marked faces for remesh and separate

operations

• Multiple criteria:

– Mark by

• Selection

• Angle

• Quality

• Islands

• Flood-fill

• Rings

– Mark settings: set parameters for the above criteria


Object preparation of sheet metal

• Example: Using a combination of Repair and Mark tools to prepare and object for external aerodynamics meshing


Object preparation

• Example: Using a combination of Repair and Mark tools to prepare a part for External Aero meshing

• Fill all punched holes (~20 in total)

• Mark faces on one side using several options

– Floodfill, angle, island, rings …

• Use Separate (Ctrl-shift-s) to create a face zone on each side for different prism settings


Usability - Miscellaneous

• Icon/Graphics

– “Sticky” Keys • Ctrl – Select will immediately execute

the previous short-cut

• Particularly useful for Hide

• Free/Multi

– Immediate show/no-show of free /multi/edges

• GUI

– Selection helper in task page

• Including Objects

• Objects – Wrap and Mesh Object unification

• Many restrictions dropped in Type modification, Cutcell, Sew, etc.


R16 Highlights

Usability/Workflow


New Features


• Graphic tools

• Surface meshing/workflow

• Volume meshing


New Feature/Performance

• Hybrid Wrapping

– One wrap, with high and low assignments

• High: Include imprinting for accurate capturing of features

• Low: Exclude imprinting for faster turnaround time and better initial cell quality

30% faster Wrapping assuming 50% of Low Wrap

• Imprinting Speedup

– Example: full size Automotive UTM model

• R15: 257 min

• R16: 42 min

Six times Faster!!

High

Low

High Wrap

Low Wrap:


Improved Workflow

• Simplified wrapper workflow • Separate GUI for Edge extraction

• Geometry recovery Options – The default recovery option is High

– Access to controls to specify Low recovery option on selected objects/zones

• Reduced GUI for Shrink Wrap


Workflow

• New color option to visualize Wrap recovery option • Ctrl+Shift+c and Ctrl+g


• Face Zone Labels for wrapper • Before wrapping the Objects are representing the zones corresponding to

original bodies

• After wrapping the Face Zone Labels are representing the sub-set of the zones on the wrapper surface corresponding to original bodies

Usability

Original and wrapped zones superimposed


Usability

• Context Menu: • Face Zone Labels – heading

– Join/Intersect

• Face Zone Labels – individual

– Join/Intersect

– Diagnostics

– Recover Periodic…

• Will recover (mesh match) the periodic Boundary Zones linked to the Face Zone Labels

• Supports simultaneous recovery of fluid and solid Zones


• Wrap workflow 1. Execute Pre-wrap commands

2. Wrap

Workflow

3. Compute Regions

5. Auto Mesh

4. Improve wrapper quality


Usability

• Face Zone Labels for Build topology • Before Build topology we have Mesh Objects representing the zones

corresponding to original bodies

• After Build topology the Face Zone Labels are representing the zones corresponding to original bodies


Robustness

• Join/Intersect • Increased robustness of Join/intersect operations

• Ability to undo/skip join locations that could produce bad joins

• All join locations are automatically re-meshed to improve cell quality

• Example joining 9 bodies

– R15

• 15 out of 16 pairs successfully joined

• Cells over 0.6 skewness on successful joins: 75

– R16

• 16 out of 16 pairs successfully joined

• Cells over 0.6 skewness on above joins: 4


Improved Workflow • Context Menu: • Volumetric regions - header

– Always Compute Regions before Volume meshing !! • Topology checks

• Orienting normals

• Baffle handling

– Validate Regions in case of modifications • Region type/name, scoped prism

– Select Regions based on type • Fluid/Solid/Dead

– Draw/Select/Delete baffles

• Volumetric regions - individual – Diagnostics

• On Fluids in particular

– Change Type… • Fluid/Solid/Dead

– Operations • Merge/Rename/Delete


Improved Workflow

• Connectivity and Quality diagnostic tools applied on Zones

• Accessible from Labels, Regions, etc.

• Avoids using inflation and high quality related criteria for solid regions

• Diagnostics also supported through TUI to allow for customized scripting of connectivity and quality improvement operations


Workflow

• Typical build topology workflow 1. Merge Objects

2. Rename

3. Join Intersect

4. Verify Face Connectivity using Diagnostics

6. Improve prism base issues and surface mesh quality using Diagnostics on Fluid regions

5. Compute Regions

7. Auto Mesh


R16 Highlights

Usability/Workflow


New Features


• Graphic tools

• Surface meshing/workflow

• Volume meshing


Usability

• Context Menu: • Cell Zones - header

– Access to Auto Mesh…

– Ability to select individual cell zones based on type

– If the Volume mesh is incorrect,

• Delete All

• Change the volume mesh settings and Re-mesh

• Note that a copy of the region is maintained before meshing. For large models, it can be disabled by setting /mesh/auto-mesh-controls copy-object-zones to “no”

• Cell Zones - individual

– Draw

• Will draw the surface mesh of the volume cells

– Delete


Usability

• New Scoped prism option accessible from Auto Mesh

• Scoped Prism name tag

• Only the most common offset methods are exposed

• Scope to objects

• Choose between Fluid, Solid or scoped regions using wild-cards

• Grow on all, only-wall or scoped zones/labels using wild cards

• You can draw selected zones to ensure the correct selections

• Ability to create/modify list/delete/write and read the scoped prism controls

• Specific Growth options…


New Feature

• New Scoped prism option accessible from Auto Mesh

• Using “Post stair-step” removal in areas of bad quality

• Parameters controlled from Growth option panel

• Highly recommended to use Auto-node-move with ICEM CFD quality to further improve quality

• Example using the “wheel-ground” example • Worst ICEM-CFD quality reduced from 0.999 to 0.975


Workflow/ Limitations

• The Volume meshing workflow of various scenarios • Failed meshes

– The failed mesh (including boundaries) will appear in the “unreferenced” folder

– If /mesh/auto-mesh-controls/create-object-on-failure is set to yes, a new mesh object is created with the prefix “failed-”

• Cutcell meshes

– The Cutcell mesh (including boundaries) will appear in the “unreferenced” folder

• Partly filled/un-complete meshing

– Tet – initialize, create prism only, HexCore only, Cavity re-meshing etc.

– These operations are currently not supported using mesh objects

• Other known limitations; on LINUX systems only

• The Model tree can only support around 1000-2000 expanded items at a time. A couple of workarounds exists

• If at import more objects exist, use graphics to delete/merge objects

• Only work with one expanded tree at a time

Fluent Meshing 16.0 Preview 4 -...

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