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Chapter 6

Introduction to HexaWorkshop 33D Pipe JunctionO-grid Creation

ICEM CFD IntroductoryCourse

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Introduction to Hexa Workshop 3

WS6.3-2ANSYS, Inc. Proprietary

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Training Manual3D Pipe Junction- Ogrid

3D Pipe Junction

In this workshop, we willimport already createdblocking on 3D Pipe geometry.

After checking the quality offirst mesh, we will create an O-grid in the blocking to improve

mesh quality.

Save the blocking.

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Introduction to Hexa Workshop 3

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Training ManualSet Working Directory

Set Working Directory

File > Change Working Directory

This will pop up a window. Selectthe directory 3DPipeJunct whereinitial project file has been saved.

It provides access to selected

directory directly All output files will be saved in

same folder until user change thelocation

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Training ManualOpen Geometry

Open Geometry

File > Open Geometry

Choose 3DPipeJucnt.tin file

Click Open

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Training ManualOpen Blocking

Open Blocking

File > Open Blocking

Choose 3DPipeJucnt.blk file

Click Open

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WS6.3-6ANSYS, Inc. Proprietary

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Training ManualBlocking Strategy

Blocking strategy

We have created Cartesian gridin 3D pipe junction in previousworkshop.

To improve the mesh quality andcapture the geometry we will becreating the Ogrid in this

workshop and compare both the

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Introduction to Hexa Workshop 3

WS6.3-7ANSYS, Inc. Proprietary

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Training ManualCompute Mesh

Compute Mesh

Select Pre-Mesh in tree

This will pop up and windowasking for re-compute mesh

Click on Yes

This will generate and

display Pre-Mesh

Mesh with 3.5 size

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Training ManualQuality Check

Quality Check

Select Blocking > Pre-MeshQuality Histogram

Select Quality in Criterion

Click Apply

Right click on Histogram

and select Show. This willdisplay the selectedelements.

Elementsselected to show

Bad quality elementsare displayed

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Training Manual

#1

#2

#3

#4

#5

O-Grid Creation Select Split Block > OGrid block

Select highlighted two Blocks andmiddle click to confirm.

Select faces highlighted in blue colorto end ogrid there. Middle click to

confirm.

Define Offset value

Click Apply

OGrid

removes bad elements

Captures geometry very well

Generates high quality mesh

OGrid Creation

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Training ManualPre-Mesh Params setting

Update Meshing Parameters

Select Pre-Mesh Params >

Meshing Parameters Select Update All

Click Apply

This will update all the parametersfor Hex Meshing

After modifying the blocking, it is

good practice to update meshingparameters to get good mesh.

#1

#2

#3

#4

Pre-mesh without updating

meshing parameters

Pre-mesh after

parameter update

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Introduction to Hexa Workshop 3

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Training ManualQuality compare

Mesh Quality

Mesh quality is improvedafter ogrid creation

Initial

Determinant 2*2*2

ImprovedDeterminant 2*2*2

Initial Quality

Improved Quality

After Ogrid Creation

Before Ogrid Creation

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Training ManualSave Blocking

Save Blocking As

Select File > Save BlockingAs..

Instead of saving project filefor each stage after fewoperation user can saveblocking file only.

Optimize the memory usage.

Save modified blocking as3DPipeJunct_ogrid.blk

Click Save.