F3_WS3-3DPipeJunction_OgridV12

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 Introduction to Hexa – Workshop 3 WS6.3-2 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training Manual3D 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. Introduction to Hexa – Workshop 3 WS6.3-3 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training ManualSet 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 Introduction to Hexa – Workshop 3 WS6.3-4 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training ManualOpen Geometry  Open Geometry – File > Open Geometry – Choose “3DPipeJucnt.tin” file – Click Open Introduction to Hexa – Workshop 3 WS6.3-5 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training ManualOpen Blocking  Open Blocking – File > Open Blocking – Choose “3DPipeJucnt.blk” file – Click Open Introduction to Hexa – Workshop 3 WS6.3-6 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training ManualBlocking 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 Introduction to Hexa – Workshop 3 WS6.3-7 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training ManualCompute 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 Introduction to Hexa – Workshop 3 WS6.3-8 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training ManualQuality 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 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 Introduction to Hexa – Workshop 3 WS6.3-10 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training ManualPre-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 Introduction to Hexa – Workshop 3 WS6.3-11 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training ManualQuality 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 Introduction to Hexa – Workshop 3 WS6.3-12 ANSYS, Inc. Proprietary © 2009 ANSYS, Inc. All rights reserved. July 2009 Inventory #002663 Training ManualSave 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.