CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Mesh Generation & Pre-Processing Software > ANSA

Quality criteria for fluent

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 1, 2016, 04:01
Post Quality criteria for fluent
  #1
New Member
 
blake
Join Date: Feb 2016
Posts: 8
Rep Power: 6
blake_varun is on a distinguished road
hello friends,
am making a mesh using ansa and going to analyse it in Fluent.
can anyone please tell me about what quality criterias should be activated in ANSA and their values....
Thank You
blake_varun is offline   Reply With Quote

Old   March 3, 2016, 14:48
Default
  #2
Senior Member
 
Vangelis Skaperdas
Join Date: Mar 2009
Location: Thessaloniki, Greece
Posts: 286
Rep Power: 17
vangelis is on a distinguished road
Hi there

If you start ANSA in CFD layout
the default quality criteria are good for Fluent cases.
Just switch to Hidden view mode to see if there are any
elements not meeting these criteria.

You can have even more quality criteria settings
if you use the UDF>Set Quality Criteria
Accessible from the
Second icon at the top from the left
UserScriuptButtons

Hope this helps

Vangelis
vangelis is offline   Reply With Quote

Old   March 5, 2016, 08:05
Post
  #3
New Member
 
blake
Join Date: Feb 2016
Posts: 8
Rep Power: 6
blake_varun is on a distinguished road
thank you so much vangelis..
am meshing a truck for the aerodynamic study...
initially i went with the default quality criteria in ANSA CFD...
but when i read that mesh in fluent and checked the quality, the orthogonal quality is below 0.01....it should be above 0.01....
So i went back to ansa and generated a new mesh with the "non-orthogonality" quality criteria checked....
this time The volume elements which failed the orthogonal quality where in the layers...
can you plz suggest any method to create the layers with no "non-orthogonal" issues...








'
blake_varun is offline   Reply With Quote

Old   March 6, 2016, 12:38
Default
  #4
Senior Member
 
Vangelis Skaperdas
Join Date: Mar 2009
Location: Thessaloniki, Greece
Posts: 286
Rep Power: 17
vangelis is on a distinguished road
You have done well activating Fluent orthogonality

How many elements were violating the limit of 0.01

Have you tried the function
Volumes>Improve>Fix Qual>Visible?

This should fix the bad elements
vangelis is offline   Reply With Quote

Old   March 6, 2016, 23:49
Post
  #5
New Member
 
blake
Join Date: Feb 2016
Posts: 8
Rep Power: 6
blake_varun is on a distinguished road
in the non-orthogonality quality criteria i had given 0.1
so there where some 3000 off elements...
i had also used the improve>fix quality>visible as well as improve>reconstruct>visible...
even though some 200+ elements are remaining...the improve function is not working on them...
Should i reduce the orthogonality quality value further????
all the elements are in layers...
blake_varun is offline   Reply With Quote

Old   March 7, 2016, 02:46
Default
  #6
Senior Member
 
Vangelis Skaperdas
Join Date: Mar 2009
Location: Thessaloniki, Greece
Posts: 286
Rep Power: 17
vangelis is on a distinguished road
I suggest you only use Improve Fix Qual, as reconstruct can only work on tetra mesh.

Fluent orthogonality of 0.1 is too strict.
Usually Fluent complains for orthogonality less than 0.01.

I suggest you re-apply Fix Qual on the original mesh, prior to fix qual with 0.1,
so that you start fresh this time with a target value of 0.01
vangelis is offline   Reply With Quote

Reply

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
General mesh quality criteria daniel.struwig NUMECA 3 October 3, 2017 03:53
[ICEM] Mesh quality criteria in ICEM Chander ANSYS Meshing & Geometry 13 September 5, 2017 08:52
[ICEM] How to improve bad quality elements that are obtained after creating prism layers? Rohith Giridhar ANSYS Meshing & Geometry 2 July 11, 2015 18:04
[ANSYS Meshing] Fluent quality criteria in AM and Gambit Far ANSYS Meshing & Geometry 6 March 24, 2012 03:35
ICEM CFD - preset quality criteria JSM CFX 2 May 7, 2008 23:36


All times are GMT -4. The time now is 19:46.