CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > ANSYS > FLUENT

TUI Init

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

LinkBack Thread Tools Search this Thread Display Modes
Old   May 28, 2013, 19:30
Default TUI Init
Join Date: Aug 2011
Posts: 87
Rep Power: 14
MachZero is on a distinguished road
I have found on the Fluent Users Guide that when I am preparing to run an LES simulation, it is recommended to run the simulation out in steady state, then to initialize the flow field using the command

solve init init-instantaneous-velocity

I notice that If I display contours of velocity before and after this step, the flow field is very different. I understand that a steady state simulation of a turbulent and unsteady flow is representing more of an average behavior, rather than one that every actually exists, but I feel like I must have missed something in how steady state simulations function and are calculated. My question is, where did this new velocity field come from? Are steady state calculations using this field (and they are just hidden from display), but simply averaging several together? Kind of like a running average?
MachZero is offline   Reply With Quote

Old   May 28, 2013, 20:38
Senior Member
Join Date: Aug 2011
Posts: 421
Blog Entries: 1
Rep Power: 21
blackmask will become famous soon enough
I have not done LES before but they seems to be some artificially generated inertial range to me. Those scales are not resolved by RANS so they do not exist for RANS. The artificially added fluctuations simply help to develop the small scales so they do not have to be realistic. Usually their spectra might subject to some constraints but ignore that for your purpose.
blackmask is offline   Reply With Quote


les model, steady and unsteady state

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
TUI zone selection in force monitors Bala Chandan FLUENT 0 May 27, 2013 11:01
TUI Commands from GUI? Carlos FLUENT 6 May 22, 2013 18:05
Patching with TUI Lovermore FLUENT 1 July 22, 2010 22:28
How to get TUI journal ringtail FLUENT 5 July 18, 2010 11:51
Define animate using TUI Zurlugh FLUENT 1 July 24, 2008 08:55

All times are GMT -4. The time now is 08:31.