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-   -   imply different domain timescales and ccl edit (http://www.cfd-online.com/Forums/cfx/101772-imply-different-domain-timescales-ccl-edit.html)

k.vafiadis May 14, 2012 04:41

imply different domain timescales and ccl edit
 
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

ghorrocks May 14, 2012 07:13

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.

k.vafiadis May 15, 2012 04:49

that's what I am gonna do and also try a few other changes :o.
Thanks for the reply!


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