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高级网格划分工具培训 ANSYS Fluent Meshing

邹剑峰

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2 Contents

1. An introduction to Fluent Meshing

2. Graphical User Interface

3. An simple example to learn how to use Fluent Meshing

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3 Contents

1. An introduction to Fluent Meshing

2. Graphical User Interface

3. An simple example to learn how to use Fluent Meshing

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Introduction to ANSYS Fluent Meshing

• Fluent Meshing overview and characteristics

− Characteristics and Terminology

− Boundary and Volume mesh generation/manipulation methods

− Flexibility

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Fluent Meshing Characteristics

• Embedded into the Fluent User

Interface

• Modern Interface, Model tree &

Icons

• Read CAD and also surface

mesh complex multi-region

assemblies

• Geared towards advanced users

with a lot of control

• Can handle billion cell + meshes

• Scriptable for batch execution

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Fluent Meshing Technology

• Historically Fluent Meshing (legacy TGrid) was a volume mesh

filler with surface mesh editing tools

− Widely used in the aerospace and automotive markets,

o including F1 for many years

− Can create very high quality, large cell count, hybrid volume meshes

Courtesy of Lola Cars

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Courtesy of John Deere Courtesy of Lilleaker Consulting AS

and Inocean-Marotec AS

Courtesy of Materialise

Fluent Meshing Technology

• A class leading surface wrapping technology was

developed

• Enlarges the scope of applications like : HVAC, Oil & Gas,

Biomedical or Underhood Thermal Management where :

− Starting point is faceted/STL geometry or CAD

− Geometry can be “dirty” with disconnected surfaces, overlapping

geometry, surface intersections, holes, etc.

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Boundary Mesh Tools Examples

Preview min & max sizes and

local size fields

Display cut-planes Display/fix highly skewed

faces/cells

Join/intersection and connection

Full local control Surface wrapping and

remeshing

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Volume Mesh Generation Methods

Tetrahedral

Hexcore

CutCell

Prisms

Thin Volume

Poly

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Mesh Flexibility

• Connect separated surface meshes together

to make conformal then fill

• Connect external hexahedral meshes to

triangular surface meshes and fill shell volume

• Scriptable TUI with extensive wildcard support

• Sweep quad/tri surfaces into hex/prism

volumes

• Remeshing tools to redistribute and improve

surface meshes

• Import 3rd Party meshes and fix, improve

quality, remesh, or insert “post” prism

layers

Remesh

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Possible Workflows

SURFACE MESH VOLUME MESH

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Caveats

• Certain operations in Fluent Meshing cannot be undone

− Merge nodes globally

− Delete Face Zones

− Surface projection

− ...

We therefore advise saving meshes

incrementally as you work!

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13 Contents

1. An introduction to Fluent Meshing

2. Graphical User Interface

3. An simple example to learn how to use Fluent Meshing

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Graphical User Interface

• What will you learn from this presentation

− How to launch Fluent Meshing

− Fluent Meshing Interface

− Terminology

− Manipulating the graphics

− Mouse Handling

− Accessing the help

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Starting Fluent Meshing

• To start Fluent Meshing − On a Windows system: click on the Fluent shortcut

icon and select Meshing Mode from the startup options

− On a UNIX system or from DOS type o Fluent 3d – meshing o Use flag –tN for N solver processors o Use flag –tmX for X meshing processors o Meshing nodes ≤ closed mesh volumes

• Fluent launches in “Meshing Mode” − Solver functionality “greyed out” until meshes

moved into solver mode − Precision only relates to the Fluent solver

processes which are spawned when volume meshes are passed to the solver

• Meshing mode is not available in 2D

Journals can be run in batch with –g –i options as

with Solver

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Graphical User Interface

Model Tree

Display / selection Options

File/CAD import Boundary operations

Display window

• Icons – Filter • Icons – Visualization • Icons – Operations

Text UI

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Model Tree & Object Types

• Under Model – 3 sections − Geometry Objects

o CAD import, using Faceted option

− Mesh Objects

o CAD import, using CFD Surface Mesh option

o Linked to Wrap, Surface Mesh & Volume Mesh - (see next slide)

• Unreferenced

o Mesh import from 3rd party / Fluent Case, ICEM mesh, …

• Model tree is used for object focused management of the meshing workflow & display − Object definition

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Model Tree & Object Types

• Geometry Objects :

− Comes directly from CAD Faceting import

− May or may not; have good quality, be closed/connected.

− Will be created from any boundary construction tool, capping, …

− Often requires a wrapping operation, …

• Mesh Objects : − Comes directly from CFD Surface Mesh import

− Good quality & connected CAD + Not too complex geometry

− Create or use an existing size field to get it meshed when

importing

Geom

Mesh

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Model Tree at First Glance

• Under Model − Access Global parameters

o Construction Geometry

o Scoped Sizing

o Material point creation

o …

− Geometry Objects

o Many objects are created

• Part name or body names, …

o Possible operations

• Draw

• Rename/change properties

• Wrap

• Summary (quality)

Right Mouse Button RMB

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• Mesh Objects − Within Each Mesh Object

o Face Zone Labels

• Represents original CAD/face zones

o Volumetric Regions

• Same as domains

o Cell Zones

o …

− A Mesh Object

o Draw , Diagnostics

o Remesh faces

o …

− Volumetric Regions

o Compute (create fluid, solid zone)

o Select Region

Model Tree at First Glance - Cont’d

RMB

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Model Tree at First Glance - Cont’d

• Under Cell Zone − Draw All

o Boundaries

o Cells in Range

− Auto Mesh

− Auto Node Move

• Unreferenced − Boundary Face Zones

o Draw

o Create New Objects…

o Merge Walls

o Info

o …

− When Reading case, WB

meshing or 3rd party file

RMB

RMB

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Probing Entities in the Graphics – Icons

Object (Ctrl-b)

Face Zone (Ctrl-z)

Edge Zone (Ctrl-z)

Face (Ctrl-f)

Edge (Ctrl-e)

Node (Ctrl-n)

RMB

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Other Selection Operators – Icons

Position

Size Probe

Select Visible

Unselect Last

Unselect All

RMB

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Operations and Display

Conditional Display (Ctrl-Shift-d)

Similar curvature (Ctrl-c)

Similar surface area (Ctrl-s)

Smaller surface area (Ctrl-l)

Primitives (Ctrl-Shift-k)

Bounding Box Creation (Ctrl-b)

Cylinder Creation (Ctrl-c)

Frustum Creation (Ctrl-f)

Create Primitive (F5)

Loop Creation (Ctrl-Shift-l)

Position/Node toggle

Trace Path toggle (Ctrl-p)

Feature path toggle (Ctrl-f)

Boundary path toggle (Ctrl-z)

Open/Closed loop toggle (Ctrl-o)

Create Edge Zone (Ctrl-l)

Create Cap (Ctrl-k)

Select all nodes (Ctrl-j)

Display/View (Ctrl-shift-)

Transparency (t) Exploded view (x)

Edge Sel. Mode (z) Show Mesh (e)

Examine

Centroid (ctrl-l)

Distance (Ctrl-

d)

Entity Info (ctrl-i)

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• Select a face

• Set a size range +/- Delta around the object

• Click on Set Ranges (sets Min-Max fields for X, Y, Z)

− Automatically resize the display around the selected element • Use the following keyboards to

• Optionally, activate and use Cutplanes as bounds

Bounds Tool to View Zoomed Area

Decrease Bounds

Increase Bounds Note: These operations are automatically used in e.g.

diagnostics panel to traverse problem regions and fix

them

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Clipping Planes

• Fast graphical clipping planes: − To get a quick cross-sectional view

− Located in the Ribbon, just to the right of the Bounds

• Limit to x, y or z

• Slider bar to move clipping plane

• Flip option

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Selection Helper

• Fast Tree and Panel selection − To the right of the clipping planes

− Use a Filter

o Face Zones

o Edge Zones

o Objects

o Objects Face Zones

o Objects Edge Zones

− Use of Wildcard

o *base*

o base*

o *se

• Any boundary containing this “string

chain” is then directly selected in any open

panels and/or in the Tree

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Mouse Handling

2 modes

Zoom in

o Draw a box from left to right Zoom out

o Draw a box from right to left

In both

modes

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Accessing the Help

• Finding more info on any functionality in a panel, is easy

• Click the Help button at the bottom right

• Opens the manual at the relevant location

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30 Contents

1. An introduction to Fluent Meshing

2. Graphical User Interface

3. An simple example to learn how to use Fluent Meshing

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