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8/10/2019 Ws14 Icemcfd Bentbar 51
1/14
ICEM CFD 5.1 New Features
Works
hop 14
Automatic Hex Meshing of aBent Bar
8/10/2019 Ws14 Icemcfd Bentbar 51
2/14
ICEM CFD 5.1 New Features
Workshop
A NSYS ICEM CFD v5.1
October 1, 2004Inventory #002157
WS14-2 2004 ANSYS, Inc.
Create a Project
Choose Open Project Icon
Browse to the desired working directory
Enter the project name
Type in the File name as: BentBar.prj
Tips:
The pull down next to the file name can be usedto quickly locate recently used projects.
In Windows, The File browser is a standardWindows file browser offering all thefunctionality of windows explorer.
In Unix or Linux, similar functionality is alsoavailable.
The Project file will contains information about project settings, the working folder and file associations.
Once the geometry, mesh, boundary conditions, parameter files etc. are saved with the project file,simply loading the project file will also load these associated files.
8/10/2019 Ws14 Icemcfd Bentbar 51
3/14
ICEM CFD 5.1 New Features
Workshop
A NSYS ICEM CFD v5.1
October 1, 2004Inventory #002157
WS14-3 2004 ANSYS, Inc.
Im port Geom etry
Open The Geometry:
File -> Geometry -> Open Geometry Or use
the Open Geometry ICONSelect: Bar.tin using File
Browser
Display: Surfaces by left mouse click on icon
Display: Solid & Wire mode by right mouseclick on Surfaces in Display Tree
Display: Transparent mode by right mouseclick on Surfaces in Display Tree
Display Tree
Bent Bar
8/10/2019 Ws14 Icemcfd Bentbar 51
4/14
ICEM CFD 5.1 New Features
Workshop
A NSYS ICEM CFD v5.1
October 1, 2004Inventory #002157
WS14-4 2004 ANSYS, Inc.
Bui ld Topo logy
BUILD TOPOLOGY:
Geometry -> Repair Geometry -> Build Diagnostic Topology
Defaul
t: Tolerance is auto-calculated as 0.06
Default: New Part Name is set to Inherited
Accept all defaults and press Apply
Observe: Because the New Part Name is set to Inherited Curves & Points will bein the Part of the associated surfaces
Turn Off: Surface display using the display tree or Wire frame Icon
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Note: Yellow lines wouldindicate (single edges) ahole.
Tips:set a reasonable tolerance
based on model sizeBy default, tolerance is set to1/1000 th the size of the modelbounding box diagonal,rounded
Use Part by part option if youare working with an assembly
8/10/2019 Ws14 Icemcfd Bentbar 51
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8/10/2019 Ws14 Icemcfd Bentbar 51
6/14
ICEM CFD 5.1 New Features
Workshop
A NSYS ICEM CFD v5.1
October 1, 2004Inventory #002157
WS14-6 2004 ANSYS, Inc.
Subd ivide Surface
Create ISO-parametric Curves:
Geometry -> Repair Geometry -> Build Diagnostic Topology
Accept all Defaults
Press Apply
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The curves appear along the cylindersurface. We can use the builddiagnostic topology to cut this surfacewith these curves
The curves change color from green(Unattached) to Red (double edges) toshow that they have Cut in.
8/10/2019 Ws14 Icemcfd Bentbar 51
7/14ICEM CFD 5.1 New Features
Workshop
A NSYS ICEM CFD v5.1
October 1, 2004Inventory #002157
WS14-7 2004 ANSYS, Inc.
Assign Element Size:
Use the new MeshParameters option to:
Mesh -> Set MeshParams by Parts
Adjust the Size andHeight of the BAR part to1
press Apply .
Hexa Sizes to view
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Set Mesh Sizes
RMB on
Surfaces
Hexa icons indicate meshsizes set on each surface
8/10/2019 Ws14 Icemcfd Bentbar 51
8/14ICEM CFD 5.1 New Features
Workshop
A NSYS ICEM CFD v5.1
October 1, 2004Inventory #002157
WS14-8 2004 ANSYS, Inc.
Auto Blocking:
From the Blocking Tab, Click on the CreateBlock icon
Select 2D as the Initialize Block Type This will create a 2D blocking structure for each
surface
These 2D Blocks will all be connected
The Default Method is All Mapped, unstructuredblocks are also available.
Select all surfaces with the a hotkey
Accept Defaults and Apply
Blocking is created Blocks are created and a Blocking branch is added to
the model tree.
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Auto Sur face Block ing
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8/10/2019 Ws14 Icemcfd Bentbar 51
9/14ICEM CFD 5.1 New Features
Workshop
A NSYS ICEM CFD v5.1
October 1, 2004Inventory #002157
WS14-9 2004 ANSYS, Inc.
Pre-mesh Param:
Blocking => Pre-mesh Params
Accept Defaults and Apply
This will update the blocking parameters with the parametersapplied to the surface mesh parameters.
Display Pre-Mesh
Left Click on Pre-Mesh under the blocking branch of themodel tree to display the Pre-mesh
Right click on Pre-Mesh to display as Solid
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Upd ate Sizes and Pre-m esh
8/10/2019 Ws14 Icemcfd Bentbar 51
10/14ICEM CFD 5.1 New Features
Workshop
A NSYS ICEM CFD v5.1
October 1, 2004Inventory #002157
WS14-10 2004 ANSYS, Inc.
Pre-mesh does not contain separate element information and can only existalong with blocking. Pre-mesh can be converted to Unstructured mesh.
Convert to Unstructured Mesh:
Right Click on Pre-Mesh under the blocking branch of the modeltree
Select Convert to Unstructured Mesh
Nodes and Elements are created. A Mesh branch will appear in the modeltree.
Hex Dom inant Meshing
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Using this Quad Dominant orpure Quad Mesh, you canuse the Hex DominantMesher
For more complicated or merely HexDominant models, this may be the bestsolution, but for this model, better hex
mesh is available from the Blocking tab!
8/10/2019 Ws14 Icemcfd Bentbar 51
11/14ICEM CFD 5.1 New Features
Workshop
A NSYS ICEM CFD v5.1
October 1, 2004Inventory #002157
WS14-11 2004 ANSYS, Inc.
2D to 3D Fill:
Blocking => Create Block => 2D to 3D
Accept Default Part Solid and method Fill
Apply
This runs the hex dominant mesher on the blocks and results in 3D blocking.
Generate Pre-mesh to view the mesh
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Blo ck ing 2D to 3D f i l l
8/10/2019 Ws14 Icemcfd Bentbar 51
12/14ICEM CFD 5.1 New Features
Workshop
A NSYS ICEM CFD v5.1
October 1, 2004Inventory #002157
WS14-12 2004 ANSYS, Inc.
The Pure Hex Mesh is higher quality than the hex dominant mesh, except at the corners.
Here the Hexa elements are opened out to almost 180 degrees and quality is poor.However, since we have access to the blocking topology, we can add an OGRID!
Ogr id
O-grid
Topology
No O-grid O-grid
8/10/2019 Ws14 Icemcfd Bentbar 51
13/14ICEM CFD 5.1 New Features
Workshop
A NSYS ICEM CFD v5.1
October 1, 2004Inventory #002157WS14-13 2004 ANSYS, Inc.
O-Grid Creation:
Blocking => Split Block => Ogrid Blo ck
Use the Block(s) Picker to select all the Blocks Use the v hotkey to select all the visible blocks
Use the Face(s) Picker to select appropriate faces
Generally; the flat surfaces that the Ogrid shouldpass through.
Specifically; The 5 faces highlighted belowand the corresponding faces on theother end.
Apply
Update Sizes:
Blocking => PremeshParams => Update sizes
Update All To ensureentity parametersare set for thenew edges
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Ogr id
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8/10/2019 Ws14 Icemcfd Bentbar 51
14/14ICEM CFD 5.1 New Features
Workshop
A NSYS ICEM CFD v5.1
October 1, 2004Inventory #002157WS14-14 2004 ANSYS, Inc.
The O-grid block topology is automaticallycreated.
Mesh is now aligned with the walls and theelement quality is greatly improved.
Other changes can also be made to theblocking file Edge Mesh Parameters
Vertex locations
Etc.
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Final Mesh
The Pre-mesh and Mesh can be further improved with thePre-Mesh smoother and hexahedral mesh smootherrespectively.
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