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

2D Ahmed body turbulence model

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

Like Tree2Likes
  • 1 Post By Jerg
  • 1 Post By vinerm

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   February 11, 2020, 13:55
Default 2D Ahmed body turbulence model
  #1
New Member
 
Jerg
Join Date: Feb 2020
Posts: 1
Rep Power: 0
Jerg is on a distinguished road
I have been simulating an Ahmed body in a steady stream. I have obtained wildly different results from using different turbulence models. All simulations have the y+ range of 0<y+<~1.


1) k-epsilon Realizable - Enhanced wall treatment:
The flow remains attached over the top of the body

2) k-omega SST - Low Re correction:
The flow separates at the curved front surface of the body.


Question: Which of these is "better"?

kepsilon.PNG

komega.jpg

your loyal servant,

Jerg
lewis donnelly likes this.
Jerg is offline   Reply With Quote

Old   February 12, 2020, 06:55
Default Compare against exp. data
  #2
Senior Member
 
vinerm's Avatar
 
Vinerm
Join Date: Jun 2009
Location: Nederland
Posts: 2,946
Blog Entries: 1
Rep Power: 35
vinerm will become famous soon enough
Ahmed body is a rather well studied profile, so, there is a lot of literature available at various Re numbers. I suppose it would be better to compare against those. I have no experience with Ahmed body, so, I cannot comment on the accuracy of the predicted flow profile but validation requires some theoretical or experimental data or an experienced peer.
Jerg likes this.
__________________
Regards,
Vinerm

PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.
vinerm 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
Problem with creating R file for SSG turbulence model Khozaei4000 OpenFOAM Running, Solving & CFD 3 April 26, 2022 17:02
6dof model - floating body flinde FLUENT 13 March 6, 2021 15:32
New turbulence model in OpenFOAM 5 with porosity scalar shinjanghosh OpenFOAM Programming & Development 0 January 15, 2020 01:06
Waterwheel shaped turbine inside a pipe simulation problem mshahed91 CFX 3 January 10, 2015 12:19
Overflow Error in Multiphase Modelling with Two Continuous Fluids ashtonJ CFX 6 August 11, 2014 15:32


All times are GMT -4. The time now is 11:33.