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

[ICEM] complicated geometry

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 23, 2010, 08:32
Default complicated geometry
  #1
New Member
 
iman
Join Date: Feb 2010
Posts: 5
Rep Power: 7
imanmirzaiian is on a distinguished road
hi every body
i,m iman and i am working on a mixer. that geometry is complete in rar file that is attached.my problem is that i have no idea how could i blocking this complicated geometry?
Attached Files
File Type: zip complicated geometry.zip (86.3 KB, 22 views)
imanmirzaiian is offline   Reply With Quote

Old   June 23, 2010, 08:34
Default is there anybody else
  #2
New Member
 
iman
Join Date: Feb 2010
Posts: 5
Rep Power: 7
imanmirzaiian is on a distinguished road
plz help me , i,m waiting online
imanmirzaiian is offline   Reply With Quote

Old   June 24, 2010, 11:11
Default Trouble...
  #3
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,662
Blog Entries: 1
Rep Power: 35
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
CFD Online isn't really a quick help sort of place... It is more like a "next day or week" sort of place. For more rapid help, you should probably call Tech Support.

But now that I am here, I see that there are problems with the zip folder. I can't extract it. Please check it.
PSYMN is offline   Reply With Quote

Old   July 6, 2010, 05:52
Default
  #4
New Member
 
iman
Join Date: Feb 2010
Posts: 5
Rep Power: 7
imanmirzaiian is on a distinguished road
hi there
my mistake !!?
about the zip file :with zip extension the size exceeds the limitation(97kb) then i make a rar file and change the extension to zip. plz change the extension to rar and have a look.
thnk u.
iman.
imanmirzaiian is offline   Reply With Quote

Old   July 6, 2010, 10:05
Default Topology...
  #5
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,662
Blog Entries: 1
Rep Power: 35
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
Ok, sure... This model is no problem (but it may be a bit tedious).

If you look from this angle, it is essentially a CGRID with an OGRID in it. From the other two directions, it is just a block with splits. As with many models, there are a variety of ways to handle it.
IMAN_01.jpg

1) You would start by creating a block around the extents and associating it to the outer curves.

2) then split to separate the concentric circles on the left from the Hgrid to the right.

3) then you could view it as a CGRID for the outer layer (select both blocks and face the front, back and right side), and then put an OGrid inside the left block or you could go with a simpler topology and just go with the Ogrid. Here I show the simpler (but lower quality) approach to create an OGrid for the concentric circles.
IMAN_02.jpg


4) once you have your ogrid index, you can split it to capture the various levels such as the circles and the inner and outer (radially) sides of those blocks. Just make sure you leave the HGrid within the center of the circle and don't associate its edges with any circles (or you will have bad angles inside the HGrid block and need to insert another Ogrid. It would still work, but would take another step).

IMAN_03.jpg

5) after associating as many edges as possible from these Ogrids, you could go and take care of the small circles (inlet/outlet?) in the sides of the right block... I will put those pics in a second post since I am limited to 5 pics here.

6) Then after doing all the simpler work and making sure the model is nicely aligned and associated, you can rotate the model sideways and create the splits to capture the side details. By the time you are done this step, you will have quite a lot of blocks and edges to work with, so it is important to do as much associating, etc. as possible before this step... so you don't have to do those things with multiple edges later.

IMAN_04.jpg


7) finish associating, moving, etc. This is the tedious part. Your eyes may start to get confused, so perhaps associate edges right after splitting for them (do steps 6 and 7 iteratively). Also, make sure you know how to use index control to limit your view to just the index planes you are working with. Also, turn off surfaces and blocks, etc. You only need to see edges and curves, keep display clutter to a minimum.
PSYMN is offline   Reply With Quote

Old   July 6, 2010, 10:14
Default Circular inlets
  #6
Senior Member
 
PSYMN's Avatar
 
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,662
Blog Entries: 1
Rep Power: 35
PSYMN has a spectacular aura aboutPSYMN has a spectacular aura about
5) in more detail.

For creating the circles in the HGrid, you have two primary options.

either way, you start by splitting to create a box that is a bit larger than the circles. (usually width of the box is double the diameter of the hole).

Then you can create a single Ogrid thru this block by selecting the block and adding faces on either end. (note: I did this before splitting in the other direction, or I would have a bunch of blocks to select, in that case, use the "from corners" selection so you don't have to pick them one by one.)
IMAN_05.jpg

Here you can see that it creates a new Ogrid index, this can be split to account for the boundary of the circle. Make sure the square Hgrid is within the circle and not associated with the curved sides (other wise the HGrid will be forced to fit to the circle and bad quality will result).
IMAN_05_OGRID.jpg

The other option is more flexible because it applies to anywhere that you may have a round hole that could create an impingement on the flow... In the perpendicular direction, create an additional split (usually the depth that you expect the jet of flow to penetrate, but here I have made it double the diameter), then select the block and face only the outside.
IMAN_06.jpg

This will give you an Ogrid (CGRID in one direction) that will capture the round inlet and give you lots of extra elements to refine the plume, but without propagating thru your whole model...
IMAN_06_Ogrid.jpg

Best regards,

Simon
PSYMN 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
Problem meshing an imported geometry Alicia Open Source Meshers: Gmsh, Netgen, CGNS, ... 0 March 30, 2010 04:53
Please help in meshing this complicated geometry eers Main CFD Forum 7 July 8, 2009 20:42
Simulation of Flow through Complex 3D Geometry EmersonKB CFX 5 July 2, 2009 08:17
Complicated geometry for baffles Julien FLOW-3D 6 October 16, 2008 08:12
vitual _ real deneb FLUENT 3 January 22, 2007 05:31


All times are GMT -4. The time now is 09:49.