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

Unreal vortices in NACA0012 at high angle of attack

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 17, 2009, 01:03
Default Unreal vortices in NACA0012 at high angle of attack
  #1
New Member
 
parvez
Join Date: Jun 2009
Posts: 8
Rep Power: 17
parvez2683 is on a distinguished road
Hi friends,
I am simulating steady state 2D naca0012 airfoil at high angle of attack. I made the C type grid with 50C*50C dimensions with blunt trailing edge. Everything is good untill when I am trying to simulate it at higher AOA like 16its showing me the vorticity near the two face connections at the trailing edge which seems to be quiet unreal. anybody knows how to fix the problem.
I am attaching the pictures of the airfoil vortices at AOA 16.
http://img32.imageshack.us/img32/3418/62143078.jpg
http://img6.imageshack.us/img6/1402/16041239.jpg
http://img7.imageshack.us/img7/9769/92423939.jpg
http://img6.imageshack.us/img6/3161/15773007.jpg

Case file link:
http://www.4shared.com/file/13324788...rfoil0012.html
parvez2683 is offline   Reply With Quote

Old   September 18, 2009, 13:27
Default
  #2
Member
 
Join Date: Apr 2009
Posts: 78
Rep Power: 17
tstorm is on a distinguished road
It looks like the trouble is grid-generated because both of those regions have high aspect-ratio cells. I've seen similar results in some of my cases. Try adapting the grid in those regions, either in FLUENT or your grid generator. FLUENT would probably be better, so you only adapt the cells in question instead of making the entire grid finer.
tstorm is offline   Reply With Quote

Reply


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
[Netgen] Import netgen mesh to OpenFOAM hsieh OpenFOAM Meshing & Mesh Conversion 32 September 13, 2011 06:50
Fluent-wrong cl value at high angle of attack Lucas FLUENT 8 December 1, 2010 07:18
modelling inviscid 2D flow at high angle of attack Ferdinando FLUENT 2 October 30, 2007 18:26
High Angle of Attack w0er Main CFD Forum 3 March 8, 2005 12:05
Multicomponent fluid Andrea CFX 2 October 11, 2004 06:12


All times are GMT -4. The time now is 00:19.