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

How to speed up reconstructPar ?

Register Blogs Community New Posts Updated Threads Search

Like Tree3Likes

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 29, 2010, 09:08
Default
  #21
Member
 
Join Date: Nov 2009
Location: Germany
Posts: 96
Rep Power: 17
val46 is on a distinguished road
Hi Bruno,

you're right, my residual plot is similar to yours. I know it's just a tutorial case but I have a similar convergence behavior in a real problem (case is very similar to the motorbike case).

I don't consider this as converged. The pressure residual is at 0.01
Sure, you can get a good first impression of the flow but nothing more.
The values for pressure and velocity should be pretty inaccurate or what would you say?

Regards,
Toni
val46 is offline   Reply With Quote

Old   October 30, 2010, 08:20
Default
  #22
Retired Super Moderator
 
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,982
Blog Entries: 45
Rep Power: 128
wyldckat is a name known to allwyldckat is a name known to allwyldckat is a name known to allwyldckat is a name known to allwyldckat is a name known to allwyldckat is a name known to all
Hi Toni,

Allow me to quote myself
Quote:
Originally Posted by wyldckat View Post
But I'm not a CFD specialist, so it's only a hunch
I also said that there are holes in the motorbike that shouldn't exist. Those holes might be damaging the solution, therefore it won't converge in 500 iterations.

AFAIK, the motorBike case was first introduced when snappyHexMesh was included in OpenFOAM. And at that time, it was a tutorial solely for snappyHexMesh, with no set-up for solver execution. So I think it's only natural that the tutorial has not yet been validated with a real experimental data.

But if you want to aim for convergence, try AdMesh for plugging the holes in the motorBike STL and increase the number of iterations to 1000-1500. At least it's what I would do, if I really needed it to work...

Best regards,
Bruno
__________________
wyldckat is offline   Reply With Quote

Reply

Tags
les, reconstructpar, slow, speed up


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
Train Speed yeo FLUENT 5 February 14, 2012 09:38
Can OpenFOAM generate flow at the speed of light? Michel_sharp OpenFOAM 6 October 24, 2009 05:09
Problem with reconstructPar fabianpk OpenFOAM 5 August 14, 2007 10:17
low speed compressible flow lily CFX 2 November 16, 2005 06:15
rotation speed in the domain jiaye gan CFX 3 April 5, 2004 09:50


All times are GMT -4. The time now is 15:28.