CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > ANSYS Meshing & Geometry

[ICEM] Mixed Grids

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   July 24, 2014, 08:27
Default Mixed Grids
  #1
New Member
 
Papis
Join Date: Dec 2010
Posts: 25
Rep Power: 6
papis is on a distinguished road
Hello,

I am trying to create a hybrid structured/unstructured mesh around a helicopter rotor. I want a stuctured grid around 1 chord of the blade and then unstructured. Because hexa meshes are of good quality i started by blocking my topology and making a structured mesh.
As you can see from the pics I have created surfases "hugging" the blades.Inside those surfaces I want the structured grid.Everywhere else unstructured.

In 2d making unstructured blocks was quite easy.However in 3D things get more complicated.

My problem is that I have around 250 blocks.It is very difficult to set up each face explicitly and even if I do that (with blocking index control) the result is poor quality mesh everywhere.

Is it possible to extract the portions of the structured grid I want (the 2 hugging surfaces) and then do a tetra/mixed flood fill in the rest of the space?

I have tried using the surface meshes of the blade and the hugging surface and then generate an octree mesh but all i get is a segmentation fault. Octree meshing the whole geometry results in a poor quality geometrical representation of the blade(How can you fill the surface with high ratio triangles instead of the classic ones)

What is the strategy one should follow for creating unstructured grids in 3d?

Any ideas would be really helpful.

Papis
Attached Images
File Type: jpg blocks.jpg (84.9 KB, 12 views)
File Type: jpg meshc2.jpg (97.2 KB, 13 views)
File Type: jpg meshc.jpg (94.5 KB, 11 views)
File Type: jpg blades.jpg (24.2 KB, 10 views)
File Type: jpg cgrid.jpg (25.6 KB, 10 views)
papis is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Cluster ID's not contiguous in compute-nodes domain. ??? Shogan FLUENT 1 May 28, 2014 15:03
Possible Bug in pimpleFoam (or createPatch) (or fluent3DMeshToFoam) cfdonline2mohsen OpenFOAM 3 October 21, 2013 09:28
A question about dynamic overset grids JXIA Main CFD Forum 4 January 10, 2008 04:50
Reloading grids in Pre Pascale Fonteijn CFX 1 July 7, 2003 13:33
UDF Face Fluxes & Partitioned Grids Greg Perkins FLUENT 0 April 6, 2001 01:50


All times are GMT -4. The time now is 21:15.