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

Changing turbulence model

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   December 21, 2014, 00:15
Smile Changing turbulence model
  #1
Senior Member
 
sunil
Join Date: Jul 2012
Location: Bangalore
Posts: 171
Rep Power: 10
sunilpatil is on a distinguished road
Dear all,
In my transient analysis (total time = 20 seconds) currently i am using k-e turbulence model. After seeing results my professor is telling to use k-e for first 10 seconds and after that switch it to k-w. I don't know why they are telling this but there must be some reason. How to switch turbulence model without stopping the run in CFX.

Thank you
sunilpatil is offline   Reply With Quote

Old   December 21, 2014, 05:22
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 16,595
Rep Power: 128
ghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the roughghorrocks is a jewel in the rough
You have to stop and restart to change turbulence models. But of course you use the first run as the initial condition for the second.

The stop/restart process is quick and easy to do so I would not be worried about it if I was you. I would be more worried about why you need to swap turbulence models half way through. It is likely to cause more problems than it solves.

My recommendation is to use the SST turbulence model for most applications. It is the most widely applicable model in CFX and has an extensive range of additions for various specific flows, such as rotation models, turbulence transition models and many more.
ghorrocks is offline   Reply With Quote

Old   December 22, 2014, 06:21
Default
  #3
Senior Member
 
sunil
Join Date: Jul 2012
Location: Bangalore
Posts: 171
Rep Power: 10
sunilpatil is on a distinguished road
K Sir thank you for your suggestion.
sunilpatil is offline   Reply With Quote

Reply

Tags
turbulence modeling

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
multiphaseInterFoam for RAS turbulence model chiven OpenFOAM Bugs 8 December 6, 2017 03:08
Implement an les turbulence model pante OpenFOAM Programming & Development 19 December 5, 2014 17:16
Overflow Error in Multiphase Modelling with Two Continuous Fluids ashtonJ CFX 6 August 11, 2014 15:32
new turbulence model in Fluent C.C FLUENT 0 August 29, 2013 11:44
Advanced Turbulence Modeling in Fluent, Realizable k-epsilon Model Jonas Larsson FLUENT 5 March 13, 2000 04:27


All times are GMT -4. The time now is 10:28.