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

imply different domain timescales and ccl edit

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 14, 2012, 03:41
Default imply different domain timescales and ccl edit
  #1
New Member
 
Kyriakos Vafiadis
Join Date: Feb 2011
Location: Kozani, Greece
Posts: 27
Rep Power: 6
k.vafiadis is on a distinguished road
Send a message via Skype™ to k.vafiadis
Hello! I run a CFX wind turbine simulation. In my case there is a stationary (the turbine environment) and a rotating frame (a disc around the rotor). In order to improve steady state convergence i try to edit the ccl file.The idea is to imply two different timescales, one for the rotating disc and one for the environment. According to CFX-Solver Modelling Guide, I can change the convergence control "for all equations in a specific domain". Unfortunately, the Guide isn't very clear on this part and I am a newbie with ccl, so I can not find the lines to change, to obtain two different timescales.
The ccl code block of the solver is:

FLOW: Flow Analysis 1 &replace SOLVER CONTROL:
Turbulence Numerics = High Resolution
ADVECTION SCHEME:
Option = Upwind
END
CONVERGENCE CONTROL:
Maximum Number of Iterations = 100
Minimum Number of Iterations = 1
Physical Timescale = 4 [s]
Timescale Control = Physical Timescale
END
CONVERGENCE CRITERIA:
Residual Target = 0.00001
Residual Type = RMS
END
DYNAMIC MODEL CONTROL:
Global Dynamic Model Control = Yes
END
END
END


I would be very happy to read your advices!
Thanks in advance!


Kyriakos
k.vafiadis is offline   Reply With Quote

Old   May 14, 2012, 06:13
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,646
Rep Power: 84
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
This sounds unnecessary to me. Why not just use the normal timescale for the whole simulation? Far simpler and that is what everybody else does.
ghorrocks is offline   Reply With Quote

Old   May 15, 2012, 03:49
Default
  #3
New Member
 
Kyriakos Vafiadis
Join Date: Feb 2011
Location: Kozani, Greece
Posts: 27
Rep Power: 6
k.vafiadis is on a distinguished road
Send a message via Skype™ to k.vafiadis
that's what I am gonna do and also try a few other changes .
Thanks for the reply!
k.vafiadis is offline   Reply With Quote

Reply

Tags
ccl editing, different timescales, solver control

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



All times are GMT -4. The time now is 17:11.