|
[Sponsors] |
October 30, 2012, 13:28 |
[Pointwise] structured mesh
|
#1 |
New Member
James
Join Date: Oct 2012
Posts: 18
Rep Power: 13 |
Hello,
I'm new user of Pointwise software. Pointwise seems to be powerful and intuitive tool for meshing. I've decided to use this software for meshing very simple geometry (straight pipe). You can download project: http://www.filefactory.com/file/1ai7lxpen9pp/n/ex2_7z This project is very similar to tutorial "Transition Duct" provided by Pointwise I loaded geometry file in format .x_b and I started meshing. I 've some weird problems: 1. I can't create structured mesh at the inlet and outlet (red mesh in project), but I can create unstructured mesh. Can someone explain me why? I 've chosen 5 conectors and option "Assemble Domains" but it doesn't work. 2. I wanted to create mesh inside the pipe. First I've created block ("blk-2" in my project) and then I clicked on "Initalize" button, but inside the pipe there is no cell mesh. Thank you in advance for your help. Best regards, James |
|
November 1, 2012, 15:41 |
|
#2 | ||
Senior Member
Chris Sideroff
Join Date: Mar 2009
Location: Ottawa, ON, CAN
Posts: 434
Rep Power: 22 |
Quote:
Within Pointwise you may choose to define each of the edges with more than one connector, meaning it is possible to assemble a structured domain, as in your case, with 5 connectors. However, in your case, the number of points used will not allow the assembly (this part is obvious). The number of points of your 5 connectors starting with the longest one on the symmetry plane moving clockwise is: 20, 5, 6, 6, 6. If instead you change the number of points for each of the 5 as: 11, 6, 6, 6, 6 it will assemble. So: Edge A uses the 11 pt connector Edge B uses the first 6 pt connector Edge C uses the second and third 6 pt connectors Edge D uses the fourth 6 pt connector Clearly edges B and C match. A has 11 points. Even though edge C has two 6 pt connectors for a total of 12, two points are at the same location - where the connectors join - so only one is counted. The general formula for computing total points on an edge is: (sum of all connector points) - (number of connectors - 1) = edge points In your case: (6 + 6) - (2-1) = 11 e2-struct-init.png illustrates the result using the above numbers. I would go another step further and smooth this domain with the solver to improve the quality (see e2-struct-solve.png). Quote:
Hope that helps, Chris Last edited by cnsidero; November 1, 2012 at 21:14. |
|||
November 1, 2012, 15:46 |
|
#3 |
Senior Member
Chris Sideroff
Join Date: Mar 2009
Location: Ottawa, ON, CAN
Posts: 434
Rep Power: 22 |
A quick follow on to my first one. The same logic applies to structured blocks, except blocks have 6 faces instead of 4 edges. Opposing faces must have the same number of points and topological arrangement.
Last edited by cnsidero; November 1, 2012 at 21:15. |
|
November 1, 2012, 17:05 |
|
#4 |
New Member
James
Join Date: Oct 2012
Posts: 18
Rep Power: 13 |
Thank you very much Chris
You've been very helpfulYou made my life easier |
|
November 1, 2012, 21:15 |
|
#5 |
Senior Member
Chris Sideroff
Join Date: Mar 2009
Location: Ottawa, ON, CAN
Posts: 434
Rep Power: 22 |
No problem. Happy to help.
|
|
Tags |
mesh, pipe, pointwise, structured |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
[snappyHexMesh] No layers in a small gap | bobburnquist | OpenFOAM Meshing & Mesh Conversion | 6 | August 26, 2015 09:38 |
[Gmsh] 2D Mesh Generation Tutorial for GMSH | aeroslacker | OpenFOAM Meshing & Mesh Conversion | 12 | January 19, 2012 03:52 |
[ICEM] Unstructure Meshing Around Imported Plot3D Structured Mesh ICEM | kawamatt2 | ANSYS Meshing & Geometry | 17 | December 20, 2011 11:45 |
Block structured hexagonal mesh vs automated tetra mesh inside Workbench for CFD | Chander | CFX | 3 | November 27, 2011 16:24 |
How to control Minximum mesh space? | hung | FLUENT | 7 | April 18, 2005 09:38 |