CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Special Topics > Mesh Generation & Pre-Processing

Combining Two Meshes

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

Like Tree2Likes
  • 1 Post By Wandadars
  • 1 Post By adityakashi

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 9, 2014, 17:01
Default Combining Two Meshes
  #1
New Member
 
Christopher
Join Date: Jun 2013
Location: Gainesville, Florida
Posts: 11
Rep Power: 12
Wandadars is on a distinguished road
Hello,

I'm new to posting on these forums. I can't seem to find the answer to my question online anywhere, so I thought I would try here.

Question: What is the procedure for combining two different meshes together.

For example, if I have a square 3D domain that is full of tetrahedral meshes and inside of the domain there is a spherical surface ( representing a particle). The mesh is generated between the spherical surface and the bounding edges of the cubical domain.

Now if I want to simulate what flow would result if one particle was placed in front of another, I could stitch two domains together at a common edge and use that combined mesh for my simulation.

I can't seem to find any discussion about 1.) How to go about doing this and 2.) Any open source software that can do this.

Am I thinking about this wrong?

Thanks,
Chris
RAMMER likes this.
Wandadars is offline   Reply With Quote

Old   May 20, 2014, 05:57
Default
  #2
New Member
 
Aditya Kashi
Join Date: May 2014
Location: Delhi, India
Posts: 2
Rep Power: 0
adityakashi is on a distinguished road
Generally, it's not so easy to merge two meshes - not many programs give this option, though in principle it's not so difficult. Basically, the nodes at the boundaries of the two meshes should match exactly, so that the corresponding nodes can be merged. I don't know what kind of software you use for simulation, but FreeFEM++ (http://www.freefem.org/ff++/) can combine meshes - I suppose it automatically aligns nearby nodes. The command is as simple as

mesh somemesh = mesh1 + mesh2;

You can export the combined mesh in the MEDIT .mesh format.
Wandadars likes this.
adityakashi is offline   Reply With Quote

Old   January 22, 2018, 09:36
Default
  #3
New Member
 
Amirhossein Zare
Join Date: Jan 2018
Posts: 1
Rep Power: 0
AmirZare is on a distinguished road
Hi Christopher,

I don't know about any open source software but I'm sure that ICEM is able to merge two different meshes. It's pretty much easy, you just need to import the first mesh domain and then import the second one. It will ask you if you want to replace or merge and you easily choose merge.

It's also possible to read multiple mesh files in Fluent. for more info follow this link https://www.sharcnet.ca/Software/Flu...ug/node171.htm
AmirZare is offline   Reply With Quote

Old   January 30, 2018, 06:51
Default Combining meshes
  #4
Senior Member
 
Colinda
Join Date: May 2012
Location: Brussels
Posts: 150
Rep Power: 13
colinda1 is on a distinguished road
As mentioned before there are several mesh generation softwares that can combine meshes even with boundaries that are not coinciding.
But of course the solver needs to be able to digest it.

In NUMECA sofware it is called a full non-matching connection. Non-matching connections still require coinciding boundary edges (even if the point distribution can be different) but in FULL non-matching the addition "FULL" refers to the fact that even the boundary edges are not coinciding.

Best regards,
Colinda
NUMECA Academic group.
colinda1 is offline   Reply With Quote

Reply

Tags
mesh combination, multiple meshes

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Read parallel meshes dl6tud OpenFOAM Programming & Development 2 March 7, 2014 04:45
Hex and Tet meshes - simplefoam comparison danvica OpenFOAM Running, Solving & CFD 10 January 4, 2013 02:18
Getting prism to inflate into mixed tet-hex meshes Joe CFX 16 October 10, 2011 08:06
Interfaces for combining meshes rbarrett ANSYS 0 July 6, 2011 12:40
Large 3D tetrahedral meshes Aldo Bonfiglioli Main CFD Forum 4 August 27, 1999 04:33


All times are GMT -4. The time now is 07:54.