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

How to use K-e model ...

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 22, 2003, 02:49
Default How to use K-e model ...
  #1
lgp
Guest
 
Posts: n/a
Hi Friends I have one question in my mind. can anybody tell me more about it.

My problem is like this: tank of size 1m X 1m X 1m. the inlet is only 6mm jet flow(fluid is water) with Re=13,000, outlet is 0.003m X 1m. Now my doubt is regarding the use of K-E turbulence model for simulating the entire tank. Major part of the tank is having cell Reynolds Number less than 200. hence if i use K-E realisable model for simulating the flow in the tank, will it be correct? Is there any method for such problem( both laminar and turbulent flow in a same domain without any demarcation)?

  Reply With Quote

Old   January 22, 2003, 04:06
Default Re: How to use K-e model ...
  #2
heydari
Guest
 
Posts: n/a
k-e RNG is so great for those fields which you have laminar flow and turbulent , bt any way i think you can use all k-e methods.
  Reply With Quote

Old   January 22, 2003, 04:07
Default Re: How to use K-e model ...
  #3
lohen
Guest
 
Posts: n/a
Hi, you can select a region with Adapt/Region and Separate the selected cells (Seperate/Cells) from the entire geometry. Then, with this new volume, called " fluid: xxx", you can put on it a "Laminar Zone" in boundary condition. And select you k-e model from the viscous menu !
  Reply With Quote

Old   January 22, 2003, 04:32
Default Re: How to use K-e model ...
  #4
lgp
Guest
 
Posts: n/a
hi, Thanks for your useful reply. For using adoption/region, we have to solve the complete domain assuming that it is turbulent flow. After this output will become basis for next adoption/ region. Therefore my doubt is regarding how to start simulating. Even in some part of the domain,if Re is less than 200 what happens if i use K-E model?

What criteria shall i use for marking laminar and turbulent regions? (i,e., Re= ?) Can you through some light on these doubts?
  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
question about turbulence model selection and sensitivity karananand Main CFD Forum 1 February 26, 2010 05:41
Centrifugal Pump and Turbulence Model Michiel CFX 12 January 25, 2010 04:20
Problems bout CFD model of biomass gasification, Downdraft gasifier wanglong FLUENT 2 November 26, 2009 00:27
Reynolds Stress model in CFX vs Fluent Tim CFX 1 October 7, 2009 06:19
Grid resolution for full-scale and down scaled model gravis Main CFD Forum 0 October 2, 2009 10:27


All times are GMT -4. The time now is 18:19.