CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > enGrid

Volume mesh algorithm

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

Reply
 
LinkBack Thread Tools Display Modes
Old   September 17, 2013, 13:10
Arrow Volume mesh algorithm
  #1
Member
 
James
Join Date: May 2013
Posts: 82
Rep Power: 4
Tensian is on a distinguished road
Hi everyone,

I need to know which algorithms does Engrid use for surface meshing and for volume meshing. Anybody knows?

Thanks in advance.
Tensian is offline   Reply With Quote

Old   September 18, 2013, 02:30
Default
  #2
Super Moderator
 
Oliver Gloth
Join Date: Mar 2009
Location: Todtnau, Germany
Posts: 114
Rep Power: 8
ogloth is on a distinguished road
Hi James,

yes I do.

First a question: Why are you interested in the internals of enGrid?

Now an attempt to answer your question:

Surface meshing is done by an iterative Delaunay mesher, i.e. points are inserted or removed based on the local mesh resolution, then the mesh is smoothed and edges are swapped according to a local evaluation of the Delaunay criterion.

Prismatic boundary layers are extruded based on local propagation vectors from the surface. The computation of these propagation vectors is not trivial and is done up-front (based on different criteria like small gaps, sharp corners, etc.).

Tetra meshing is done by the NETGEN library and I think the best would be to look on their website for more details (http://sourceforge.net/projects/netgen-mesher/).

We are, however, thinking of using a similar approach to the surface mesher for tetra meshing. As it stands we have access to an old F77 code which takes an existing tetra mesh and optimises it by inserting and deleting nodes, smoothing it and applying local reconfigurations. It all depends a bit on the time -- or money;-) -- we find to dedicate to the inclusion of this tool into enGrid.

I hope this helps a little bit!

Cheers,
Oliver
ogloth is offline   Reply With Quote

Old   September 18, 2013, 09:57
Arrow
  #3
Member
 
James
Join Date: May 2013
Posts: 82
Rep Power: 4
Tensian is on a distinguished road
Thanks for your fast reply Oliver,

I am searching the most suitable meshing software for my PhD. I read in the terminal somethig about Delaunay but also I can see some items related to Octree. So I am wondering what was the algorithm used just when you click at "Create/Improve Volume mesh".

In NETGEN website I saw that Advancing Front and Delaunay are used, but I am not sure the one that is used in NETGEN configuration for Engrid.

I worked with ICEM and Delaunay algorithm is fast and used to give good results for my CFD model.

Thanks again and if itīs possible please let me know the algorithm choice you have done for Engrid volume meshing.
Tensian 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
Moving mesh Niklas Wikstrom (Wikstrom) OpenFOAM Running, Solving & CFD 122 June 15, 2014 06:20
dynamic Mesh is faster than MRF???? sharonyue OpenFOAM Running, Solving & CFD 14 August 26, 2013 07:47
[ICEM] Generating Mesh for STL Car in Windtunnel Simulation tommymoose ANSYS Meshing & Geometry 48 April 15, 2013 04:24
channelFoam for a 3D pipe AlmostSurelyRob OpenFOAM 3 June 24, 2011 13:06
On the damBreak4phaseFine cases paean OpenFOAM Running, Solving & CFD 0 November 14, 2008 22:14


All times are GMT -4. The time now is 10:40.