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

[ICEM] Problem with a C-Grid meshing technique for a wing

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 20, 2017, 04:12
Default Problem with a C-Grid meshing technique for a wing
  #1
New Member
 
Arjit Seth
Join Date: Oct 2016
Posts: 1
Rep Power: 0
GodotMisogi is on a distinguished road
Hello, this is my first post on these forums. I'm a newbie to CFD analysis, so please guide me by pointing out any mistakes you observe in my posts.

I've been playing around with 2D ICEM CFD meshes around airfoils with some success, but haven't been able to implement a 3D mesh around a wing with successful results.

The following analysis investigates the performance of a rectangular wing with an SG6042 at a low Reynolds number of 300,000 using ANSYS Fluent. The meshing strategy I came up with was based on a C-grid technique I learnt in 2D analyses, whose logic I extrapolated into 3D. The video I used to learn the C-grid implementation in 2D is:






The problem, I believe, lies somewhere in the meshing setup. The CFD results show the coefficient of lift values oscillating in the thousands (sometimes peaking in the millions). Pausing the solution and checking the velocities in CFD-Post shows that the front of the exposed wingtip has air which reaches velocities of Mach 2, which is obviously impossible.

Any ideas on what the issues could be?
GodotMisogi is offline   Reply With Quote

Old   May 22, 2017, 04:50
Default
  #2
New Member
 
Kirill Makarov
Join Date: Feb 2017
Posts: 11
Rep Power: 5
Kirill_Makarov is on a distinguished road
Unfortunately you did not describe what was exactly the problem with your mesh. At first sight you can improve your mesh in two ways. First of all, it seem like you use default amount of aspect ratio of 2. Try to reduse it up to 1.2 or 1.1. Second issue is that you have huge difference in cell lenght on trailing edge. Try to smooth it.
Kirill_Makarov is offline   Reply With Quote

Reply

Tags
airfoil 3d, c-grid, mesh 3d, wing

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
Problem with querying the meshing database in CFX-Pre ashtonJ CFX 16 November 23, 2016 04:56
Zoom In problem (Grid distortion) xq712000 Pointwise & Gridgen 3 January 23, 2014 08:46
[ICEM] Unstructure Meshing at the Wing Tip Surface from Imported Plot3D Structured Mesh yona ANSYS Meshing & Geometry 8 January 21, 2014 11:06
Multi element wing 3-d problem: trailing edge resolution sriram042000 CFX 2 March 13, 2011 06:44
Volume Meshing & Face Meshing? singularity of grid ken FLUENT 0 September 4, 2003 12:08


All times are GMT -4. The time now is 18:42.