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

2D turbulent flow around Bluff Body convergence issues

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 24, 2015, 16:00
Thumbs up 2D turbulent flow around Bluff Body convergence issues
  #1
New Member
 
Join Date: Jun 2015
Posts: 7
Rep Power: 11
AZ1621 is on a distinguished road
Hello,

I am currently running a 2D transient simulation of turbulent flow over 2 inline bluff bodies. I am using realizeable k-e method, and dynamic mesh smoothing. I have a structured grid which I believe to be adequate for my model but when I am running my simulation for 100 time steps and I am seeing some odd things with my residuals.The energy will drop quickly to about 1e-16 but the x and y settle down to 1e-3 and don't go any lower. The continuity will go no lower than 1e-2 and will spike every timestep before settling down as the iterations continue. The flow behaves the way experimental data has shown it to I am just unsure as what the best way to go about improving these residuals would be (specifically the continuity). I checked the residual contours and I see a large mass imbalance on my outlet boundary. Could this be part of the issue?
Any advice on the matter would be greatly appreciated. Thanks!
AZ1621 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
How to apply these schemes in 2D transient flow over bluff body nuhshah FLUENT 0 April 22, 2015 03:18
unsteady convergence problem for bluff body Byukuya FLUENT 2 October 28, 2010 11:59
Simulation of Flow induced vibration on an elastically mounted bluff body in a cross pradeepta FLUENT 2 September 17, 2009 08:18
bluff body flow puneshwar verma FLUENT 0 February 28, 2007 02:30
flow behind bluff body puneshwar verma FLUENT 0 February 27, 2007 07:12


All times are GMT -4. The time now is 23:07.