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

Structured mesh for airfoil

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 20, 2009, 04:14
Default Structured mesh for airfoil
  #1
Senior Member
 
Join Date: Nov 2009
Location: Michigan
Posts: 135
Rep Power: 7
doubtsincfd is on a distinguished road
Hi!
I am trying to generate a structured mesh around an airfoil using Gridgen software. The grid should provide for implementation of periodic boundary condition (boundaries parallel to the flow direction). Also there is clustering near the leading edge of the airfoil. Is it possible to generate an O grid with these constraints? What type of grid will suffice these conditions? I tried using cartesian grid but because of the clustering requirement the aspect ratio of the cells near the top and bottom boundary becomes large (as the grid is clustered near the leading edge in x direction but the spacing increases in y direction as we move away from the airfoil)
doubtsincfd is offline   Reply With Quote

Old   November 21, 2009, 10:51
Default
  #2
Senior Member
 
John Chawner
Join Date: Mar 2009
Location: Fort Worth, Texas, USA
Posts: 224
Rep Power: 9
jchawner is on a distinguished road
Hello doubtsincfd.

In general, meshing an airfoil with H, O, C, or other topology is not a problem for Gridgen or any other decent software for that matter.

What I don't understand is the requirement for periodicity. Where exactly in the 2D O-grid will you be applying periodicity? There will be three boundaries: the outer farfield boundary, the airfoil surface, and the wake coming off the trailing edge and going to the outer boundary. The wake is an interblock connection or pass-thru boundary and won't be periodic. What am I misunderstanding?
__________________
John Chawner / jrc@pointwise.com / www.pointwise.com
Blog: http://blog.pointwise.com/
on Twitter: @jchawner
jchawner is offline   Reply With Quote

Old   November 21, 2009, 15:32
Default
  #3
Senior Member
 
Join Date: Nov 2009
Location: Michigan
Posts: 135
Rep Power: 7
doubtsincfd is on a distinguished road
The airfoils are stacked one over other. In such case how can I apply periodic boundary condition on the far field boundary since the far field boundary will have an O or C shape?
doubtsincfd is offline   Reply With Quote

Old   November 21, 2009, 17:16
Default
  #4
Senior Member
 
John Chawner
Join Date: Mar 2009
Location: Fort Worth, Texas, USA
Posts: 224
Rep Power: 9
jchawner is on a distinguished road
Doubts:

It would be better if you could either attach a picture or email me your geometry in a format that Gridgen or Pointwise can read. Thanks.
__________________
John Chawner / jrc@pointwise.com / www.pointwise.com
Blog: http://blog.pointwise.com/
on Twitter: @jchawner
jchawner is offline   Reply With Quote

Old   November 23, 2009, 00:02
Default
  #5
Senior Member
 
Join Date: Nov 2009
Location: Michigan
Posts: 135
Rep Power: 7
doubtsincfd is on a distinguished road
Or maybe I can simplify my problem....
What shape of domain(outer/far field boundary) should I use if I want to generate a structured grid for flow over stacked airfoils and if I want to simulate by using periodic boundary condition?
Thanks for the help!
doubtsincfd is offline   Reply With Quote

Old   November 23, 2009, 09:31
Default
  #6
Senior Member
 
John Chawner
Join Date: Mar 2009
Location: Fort Worth, Texas, USA
Posts: 224
Rep Power: 9
jchawner is on a distinguished road
Doubts:

Sounds like you might be doing a 2D simulation of a blade row in a turbomachine and need periodicity between the blades. Of course, the simplest topology would be to use a straight line for the periodic boundary. But that depends, of course, on the geometry of the blades and the other requirements of your grid like how fine it will be for accuracy near the blade surface and whether the surface topology will extend all the way to the outer boundary.

Don't hesitate to contact our Tech Support at 888-4PTWISE or support@pointwise.com - they'll be happy to help you work through all the options.
__________________
John Chawner / jrc@pointwise.com / www.pointwise.com
Blog: http://blog.pointwise.com/
on Twitter: @jchawner
jchawner 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
[ICEM] Unstructure Meshing Around Imported Plot3D Structured Mesh ICEM kawamatt2 ANSYS Meshing & Geometry 17 December 20, 2011 12:45
Structured mesh of a 3d sharp trailing edge Gilles Main CFD Forum 2 May 23, 2008 13:23
Error Converting ICEM Structured Mesh to CFX Chebeba CFX 11 October 5, 2006 08:05
dynamic mesh - structured or cooper mesh Manoj Kumar FLUENT 2 November 11, 2005 02:18
How to control Minximum mesh space? hung FLUENT 7 April 18, 2005 09:38


All times are GMT -4. The time now is 23:59.