WS4.3-1
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Chapter 4
Volume Meshing –
Workshop 3
Femur BF Cartesian
Meshing
ICEM CFD Introductory
Course
Volume Meshing – Workshop 3
WS4.3-2
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July 2009
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Training ManualSet Working Directory
• Set working directory
– File > Change Working
Dir…
– Choose Femur
– OK
Volume Meshing – Workshop 3
WS4.3-3
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Training ManualImport Geometry
• File -> Workbench Readers
• Select the file LeftFemur.agdb (Design
Modeler Geometry)
• Push the “Open” button
• Before importing the Geometry, the
user is presented with options
• Keep Workbench defaults
• Import Geometry
• Create Subset from Named Selection
Named Selections can be setup in
DM, Simulation or CAD packages
such as UG, Pro/E or SolidWorks
We are not setting any Named
Selection Prefixes
• Accept the Defaults and apply
Volume Meshing – Workshop 3
WS4.3-4
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Training ManualCreate Parts from Subsets
• Each Body comes in as a Part
• The named Selections appear as Geometry Subsets
– These can be used to control display or selection
– These can be turned into Parts
• Make sure all the Subsets are active
• Right Click on “Subsets” and choose “Create Part”
• The new parts can be displayed
Volume Meshing – Workshop 3
WS4.3-5
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Training ManualGlobal Mesh Setup
Mesh > Global Mesh Setup > Global
Mesh Size
• Set Max element = 64
• Hit Apply
Mesh > Global Mesh Setup > Volume
Meshing Parameter
Set the Mesh Type to “Cartesian”
Set the Mesh Method to “Body-Fitted”
Keep the defaults as shown
Refinement Type is set to “Uniform”
Project Inflated Faces is Checked
Apply
Volume Meshing – Workshop 3
WS4.3-6
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Training ManualPart Mesh Setup
• Mesh -> Part Mesh Setup
– This brings up the Part Mesh Setup dialog
• Left Click on the max size header
– This brings up the MAX SIZE dialog
– Set max size to “5”
– Accept
• Left Click in the BONESHAFT max size field
– Change the “5” to a “15”
• Left Click on the Prism Header
• Apply
• Dismiss
The prism control is used
to control which surfaces
are inflated in BFCart
Volume Meshing – Workshop 3
WS4.3-7
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Training ManualInitialize hexa blocking
• Blocking -> Create Block
– This step is optional, BFCart could create its own cartesian mesh
– This enables us to control the biasing with ICEM CFD Hexa’s
advanced edge parameter and splitting functionality
• Initialize Blocks
– Type should be set to 3D Bounding Box
• We just want a rectangular box to represent cartesian space
– Click the “select geometry” icon
– Click on the “all” icon in the Select geometry toolbox
• Or use the “a” hotkey
• Click the middle mouse button to end
Volume Meshing – Workshop 3
WS4.3-8
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Training ManualSplit Block
• The Two primary ways to create Cartesian Stations are
splitting and Edge Params
• Blocking -> Split Block
– Click on the “Select edges” icon
– as prompted, hold-left click on one of the long edges
• With the left button still down, drag the split to
create a box around the ball joint
• release the left mouse button and click the middle
mouse button to accept the split
– This DEZ will auto-iterate (repeat)
• When prompted again repeat the above process to
create a box around the knee joint
• Middle mouse button Twice to accept the split and
then end the command
Volume Meshing – Workshop 3
WS4.3-9
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July 2009
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Training ManualPre-Mesh Params
• Expand the Blocking Branch of the Model Tree
• Right Click on Edges
– Left Click on Bunching
– This will display Edge Bunching (Station Distribution)
• Blocking -> Pre-Mesh Params
– The blocking is a separate entity from the geometry
– This next step will transfer the Part Mesh Params to the
blocking
• Update Sizes
– Update All
– Apply
Volume Meshing – Workshop 3
WS4.3-10
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Training ManualPre-Mesh Params
• Pre-Mesh Params -> Edge Params
• Click the “Select edges” icon and Left Click on one of the
longest edges (along the shaft)
– Depending on your exact split locations, this should show
approximately 26 Nodes
– Change the Spacing 1 and Spacing 2 to “5”
• This will match the spacing at the ends
– Change the Ratio 1 and Ratio 2 to “1.2”
– Turn on Copy Parameters
– Set Copy Method to “To All Parallel Edges”
– Apply
Volume Meshing – Workshop 3
WS4.3-11
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July 2009
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Training ManualWrite Cartesian Grid
• File -> Save project As
• Save as Femur.prj
• File -> Blocking -> Write Cartesian Grid
– This converts the splits and Biasing to Cartesian Stations
– The file (FEMUR.crt) is saved in the Project dir
You don’t need to view the Cartesian
mesh; but if you did, it would look
like this
Volume Meshing – Workshop 3
WS4.3-12
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Training ManualCompute Mesh
• Select Mesh > Compute Mesh > Volume Mesh
Set the Mesh Type to “Cartesian”
Set the Mesh Method to “Body-Fitted”
Stair step is also an option
The Volume Part will be automatically created
Turn on the option to Use Split from Grid File
This is why we made the cartesian file
Click on the File Browse icon and Select the
FEMUR.crt file we just created
Note: one was also included in the tutorial files
Set Inflate Parts to “Defined’
This will use the Part Mesh Params to control the
inflation
Compute
If you are prompted to save the tetin file, accept
it
BFCart is a batch process that runs off the last
saved file
Volume Meshing – Workshop 3
WS4.3-13
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Training ManualMesh
• The mesh should take about 30 seconds to generate.
Biasing toward high aspect ratio
hexas in the middle
Note: this mesh is pure Hexa. There
is a global option for creating
pyramids which is useful if the
model has sharp features inducing
poor quality.
Volume Meshing – Workshop 3
WS4.3-14
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Training ManualCutplane View
• Adjust the Method to “Middle Y Plane”
• In the Model Tree, turn on the Mesh -> Volume
• Adjust the Fraction Value to cut thru different
parallel slices.
– Try out some other Methods
• When you find a cross section you want to “keep”
– Click Create mesh subset
– You can view these later thru the
Mesh subsets in the model tree.
• In the model tree, Right Click on Mesh
• Select Cut Plane -> Manage Cut Plane
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