1. WS6.3-1 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Chapter 6 Introduction to Hexa – Workshop 3 3D Pipe Junction O-grid Creation ICEM CFD Introductory Course

2. Introduction to Hexa – Workshop 3 WS6.3-2 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training Manual 3D Pipe Junction- Ogrid  3D Pipe Junction – In this workshop, we will import already created blocking on 3D Pipe geometry. – After checking the quality of first mesh, we will create an O- grid in the blocking to improve mesh quality. – Save the blocking.

3. Introduction to Hexa – Workshop 3 WS6.3-3 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training Manual Set Working Directory  Set Working Directory – File > Change Working Directory – This will pop up a window. Select the directory 3DPipeJunct where initial project file has been saved. It provides access to selected directory directly All output files will be saved in same folder until user change the location

4. Introduction to Hexa – Workshop 3 WS6.3-4 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training Manual Open Geometry  Open Geometry – File > Open Geometry – Choose “3DPipeJucnt.tin” file – Click Open

5. Introduction to Hexa – Workshop 3 WS6.3-5 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training Manual Open Blocking  Open Blocking – File > Open Blocking – Choose “3DPipeJucnt.blk” file – Click Open

6. Introduction to Hexa – Workshop 3 WS6.3-6 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training Manual Blocking Strategy  Blocking strategy –We have created Cartesian grid in 3D pipe junction in previous workshop. –To improve the mesh quality and capture the geometry we will be creating the Ogrid in this workshop and compare both the

7. Introduction to Hexa – Workshop 3 WS6.3-7 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training Manual Compute Mesh  Compute Mesh – Select Pre-Mesh in tree – This will pop up and window asking for re-compute mesh – Click on Yes – This will generate and display Pre-Mesh Mesh with 3.5 size

8. Introduction to Hexa – Workshop 3 WS6.3-8 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training Manual Quality Check  Quality Check – Select Blocking > Pre-Mesh Quality Histogram – Select Quality in Criterion – Click Apply – Right click on Histogram and select Show. This will display the selected elements. Elements selected to show Bad quality elements are displayed

9. Introduction to Hexa – Workshop 3 WS6.3-9 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training Manual #1 #2 #3 #4 #5  O-Grid Creation –Select Split Block > OGrid block Select highlighted two Blocks and middle click to confirm. Select faces highlighted in blue color to 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

10. Introduction to Hexa – Workshop 3 WS6.3-10 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training Manual Pre-Mesh Params setting  Update Meshing Parameters – Select Pre-Mesh Params > Meshing Parameters Select Update All Click Apply – This will update all the parameters for Hex Meshing – After modifying the blocking, it is good practice to update meshing parameters to get good mesh. #1 #2 #3 #4 Pre-mesh without updating meshing parameters Pre-mesh after parameter update

11. Introduction to Hexa – Workshop 3 WS6.3-11 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training Manual Quality compare  Mesh Quality –Mesh quality is improved after ogrid creation Initial Determinant 2*2*2 Improved Determinant 2*2*2 Initial Quality Improved Quality After Ogrid Creation Before Ogrid Creation

12. Introduction to Hexa – Workshop 3 WS6.3-12 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training Manual Save Blocking  Save Blocking As… – Select File > Save Blocking As.. – Instead of saving project file for each stage after few operation user can save blocking file only. – Optimize the memory usage. – Save modified blocking as ‘3DPipeJunct_ogrid.blk’ – Click Save.