CFD Online URL
[Sponsors]
Home > Forums > FLUENT

Dynamic meshing of oscillating airfoil (2d)

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

Like Tree1Likes
  • 1 Post By poya0070

Reply
 
LinkBack Thread Tools Display Modes
Old   August 2, 2013, 02:19
Post Dynamic meshing of oscillating airfoil (2d)
  #1
New Member
 
Join Date: Jul 2013
Posts: 2
Rep Power: 0
abhiramBA is on a distinguished road
Hello,
I am trying to simulate the oscillatory motion of an airfoil. I have successfully compiled my udf and the library is also loaded. I do not know what settings I should use in the dynamic mesh. Only the airfoil seems to oscillate and the grid stays as it is.
Also, when I solve, I get an error saying "Update-Dynamic-Mesh failed. Negative cell volume detected."
Kindly guide me through the dynamic meshing.
abhiramBA is offline   Reply With Quote

Old   August 6, 2013, 23:50
Default
  #2
New Member
 
Join Date: Jul 2013
Posts: 5
Rep Power: 3
hy2049 is on a distinguished road
Hi, I'm doing the same thing with you. I also met some problems. So would you like to share your files with me and let's figure out the problems together.
hy2049 is offline   Reply With Quote

Old   August 7, 2013, 02:41
Default
  #3
New Member
 
Join Date: Jul 2013
Posts: 2
Rep Power: 0
abhiramBA is on a distinguished road
Alright!
Here is my grid.
Attached Images
File Type: jpg ellipse_1.jpg (98.6 KB, 33 views)
abhiramBA is offline   Reply With Quote

Old   August 7, 2013, 04:05
Default
  #4
Senior Member
 
Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 463
Rep Power: 12
vasava will become famous soon enough
'Negative cell volume' error indicates that you haven't done the 'dynamic mesh' settings properly.

Can you post your settings here? It would help to help.
vasava is offline   Reply With Quote

Old   August 7, 2013, 04:11
Default
  #5
Senior Member
 
Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 463
Rep Power: 12
vasava will become famous soon enough
More over...
1. The mesh/boundary displacement per time step can not be more that the smallest element size of your mesh.
2. The mesh/boundary displacement per time step should be selected so that the minimum quality of the mesh (after update) does not exceed the worst quality of the mesh you have declared.
vasava is offline   Reply With Quote

Old   August 7, 2013, 04:31
Default
  #6
New Member
 
Join Date: Jul 2013
Posts: 5
Rep Power: 3
hy2049 is on a distinguished road
Quote:
Originally Posted by abhiramBA View Post
Alright!
Here is my grid.
Is that better to use an unstructure mesh if we want to use dynamic mesh here?
hy2049 is offline   Reply With Quote

Old   August 7, 2013, 06:38
Default
  #7
Senior Member
 
Paritosh Vasava
Join Date: Oct 2012
Location: Lappeenranta, Finland
Posts: 463
Rep Power: 12
vasava will become famous soon enough
Quote:
Originally Posted by hy2049 View Post
Is that better to use an unstructure mesh if we want to use dynamic mesh here?
Yes indeed. Using triangular mesh elements would be more appropriate for dynamic mesh.
vasava is offline   Reply With Quote

Old   September 7, 2013, 14:17
Exclamation negative
  #8
New Member
 
poya
Join Date: Jun 2013
Posts: 4
Rep Power: 3
poya0070 is on a distinguished road
Quote:
Originally Posted by abhiramBA View Post
Hello,
I am trying to simulate the oscillatory motion of an airfoil. I have successfully compiled my udf and the library is also loaded. I do not know what settings I should use in the dynamic mesh. Only the airfoil seems to oscillate and the grid stays as it is.
Also, when I solve, I get an error saying "Update-Dynamic-Mesh failed. Negative cell volume detected."
Kindly guide me through the dynamic meshing.



about this problem i study in fluent lecture that must be to have a skewness less than 0.7 or acceptable(less than 0.9-0.95, i dont know more).
but in my project(same ur project) resolve this notice and problem yet appear(Although in more time step) and in preview mesh motion the quality orthogonal after several time step is less than 0.05. and then error ......

what setting in remeshing and smothing is required to resolve this problem ?
Durga Sravan likes this.
poya0070 is offline   Reply With Quote

Reply

Tags
dynamic mesh, oscillating airfoil, pitching airfoil, udf

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
[mesh tool] meshing airfoil naca 0015 peter pan ANSYS Meshing & Geometry 0 June 15, 2011 10:26
dynamic meshing pronik_zoro ANSYS Meshing & Geometry 0 March 12, 2011 12:01
[GAMBIT] Dynamic Meshing of a combustion chamber donarundas ANSYS Meshing & Geometry 1 December 2, 2009 08:13
Oscillating airfoil problem ganesh Main CFD Forum 2 June 27, 2005 14:57
Meshing An airfoil with a simple plain flap S. Kalam FLUENT 7 January 30, 2005 21:22


All times are GMT -4. The time now is 18:56.