# imply different domain timescales and ccl edit

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 May 14, 2012, 03:41 imply different domain timescales and ccl edit #1 New Member   Kyriakos Vafiadis Join Date: Feb 2011 Location: Kozani, Greece Posts: 27 Rep Power: 6 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

 May 14, 2012, 06:13 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,824 Rep Power: 85 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.

 May 15, 2012, 03:49 #3 New Member   Kyriakos Vafiadis Join Date: Feb 2011 Location: Kozani, Greece Posts: 27 Rep Power: 6 that's what I am gonna do and also try a few other changes . Thanks for the reply!

 Tags ccl editing, different timescales, solver control

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