Ws14 Icemcfd Bentbar 51

8/10/2019 Ws14 Icemcfd Bentbar 51

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ICEM CFD 5.1 New Features

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Automatic Hex Meshing of aBent Bar


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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.


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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


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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


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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.


7/14ICEM CFD 5.1 New Features

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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



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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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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



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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!



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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



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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



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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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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.

Ws14 Icemcfd Bentbar 51

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