CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Main CFD Forum

turbulence modeling in turbofan

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

Reply
 
LinkBack Thread Tools Display Modes
Old   November 9, 2010, 18:50
Default turbulence modeling in turbofan
  #1
Senior Member
 
Saima
Join Date: Apr 2009
Location: Canada
Posts: 140
Rep Power: 8
Saima is on a distinguished road
Hello,

I am looking for documentation turbulence modeling in turbofa. If anybody has some papers or thesis on it please let me know.

Regards,
Saima is offline   Reply With Quote

Old   November 10, 2010, 05:01
Default
  #2
Far
Super Moderator
 
Far's Avatar
 
Sijal Ahmed Memon (turboenginner@gmail.com)
Join Date: Mar 2009
Location: Islamabad Pakistan
Posts: 3,905
Blog Entries: 6
Rep Power: 38
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
hi
Can you elaborate more that what you want to know. whether you want to know about the best turbulence model for turbofan engine?

Regards
Far
Far is offline   Reply With Quote

Old   November 10, 2010, 08:19
Default
  #3
Member
 
Join Date: Oct 2010
Posts: 44
Rep Power: 6
siri is on a distinguished road
Salma

frankly, I don't know answer to your question but as soon as i read it I am somewhat curious for the way it sounded. i mean, does it being a turbofan engine signify something unique here?

as far as my knowledge goes, one picks appropriate turbulence model for an analysis based on its relative strength (or lack of it) in capturing the physics of interest at a particular region of geometry.

So practically speaking, it should not matter, whether you are analyzing for an aircraft engine or a valve in a heart. Its the physics of flow guiding the modeling choices most often rather than the application.

Please correct if I am wrong.


S
siri is offline   Reply With Quote

Old   November 11, 2010, 01:20
Default
  #4
Senior Member
 
Hamid Zoka
Join Date: Nov 2009
Posts: 162
Rep Power: 8
Hamidzoka is on a distinguished road
Dear Salma
some turbulence models does not have a satisfactory performance in calculating turbulence characteristics of a specific flow such as lengh scale, etc.
So, you should refer to articles which are focused on evaluating turbulence models applied to turbomachines.
as far as i know, for turbomachinery applications k-Omega SST and h2f models show satisfactory results.

regards
Hamidzoka is offline   Reply With Quote

Old   November 21, 2010, 12:01
Default
  #5
Senior Member
 
Saima
Join Date: Apr 2009
Location: Canada
Posts: 140
Rep Power: 8
Saima is on a distinguished road
Hi all,

Thanks for your replies.

What i studied up-till now i derived RANS by using incompressible and x Navier stokes equations, read models from Zero,1eqiations... Reynlds stress Model and LES. I read pros and cons of every models. Frim literature anf fluent user gide its clear k-omega is googd for turbomachinery application.


But the topic which i have to write report was "Turbulence Modeling for Turbofan". We always take compressible flow for fan. Then i realized i should read turbulnec modeling with compressible effect. I found derivations upto RANS for compressible flow. But after that how can it implements on all of above models (Zero to LES).
I found k-omega model for compressible flow in Wilcox and fluent give k-epsilon as well (in fluent).

In most of the literature i found prople are using RANS and LES(conventional) for turbofan and having good results.

It's just confusion between compressible and incompressible. What could be my criteria. I have not found and compile report for turbulence model on turbofan. If any of you have please let me know.

Best Regards,
Saima
Saima is offline   Reply With Quote

Old   November 21, 2010, 18:47
Default
  #6
Administrator
 
jola's Avatar
 
Jonas Larsson
Join Date: Jan 2009
Location: Gothenburg, Sweden
Posts: 162
Rep Power: 10
jola is on a distinguished road
Send a message via MSN to jola Send a message via Skype™ to jola
Turbulence modeling for mildly compressible flows is just a simple reformulation of non-compressible turbulence models. Only when you come up to hypersonic flows can it become necessary to model compressible effects on turbulence. You can get more information from the terms that can be neglected in mildly compressible flows if you read the governing equations chapter in my old thesis.
jola is offline   Reply With Quote

Reply

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
Discussion: Reason of Turbulence!! Wen Long Main CFD Forum 3 May 15, 2009 09:52
May Focus Area: Turbulence Modeling Jonas Larsson CFD-Wiki 0 May 2, 2006 11:48
Turbulence modeling for fan/compressor blading Jonas Larsson FLUENT 1 April 13, 2005 14:08
turbulence modeling questions llowen Main CFD Forum 3 September 11, 1998 04:24


All times are GMT -4. The time now is 12:02.