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charles November 4, 2006 10:03

Timescale Information in the Output File
 
Hi, i want to adjust that Timescale Information which, is been writing after every 5 iterations in the Output File, must been writen after 10 or 20 iterations. how to do it?

regards.

charles.

Robin November 6, 2006 11:59

Re: Timescale Information in the Output File
 
Hi Charles,

You can either set a physical timescale, in which case the timescale is not updated at all, or add the Timescale Update Frequency parameter to the solver control (by editing your CCL in the command editor in Pre).


FLOW:
SOLVER CONTROL:
CONVERGENCE CONTROL:
Length Scale Option = Conservative
Maximum Number of Iterations = 100
Timescale Control = Auto Timescale
Timescale Update Frequency = 10
END
END
END


Regards,
Robin

charles November 6, 2006 15:25

Re: Timescale Information in the Output File
 
Hi Robin, i thank you for your help. i want to consult about that Inc. viscous work term in total energy for heat transfer modeling with sst turb. modeling. to not choose that inc. viscous work term affects sst results? Can you explain shortly that sst and inc. viscous work term have how an interaction?

Again, thank you.

best regards.

charles.

Robin November 8, 2006 10:32

Re: Timescale Information in the Output File
 
Hi Charles,

The viscous work term will not effect convergence directly. This adds an additional source to the energy equation to account for work done by a moving wall on a fluid. If you walls are all stationary in the relative frame, it has no effect.

Regards, Robin

charles November 8, 2006 10:53

Re: Timescale Information in the Output File
 
Hi Robin,

The blade is my only wall in the rorating domain thus wall is moving as rotating wall.Then, inc. viscous work term will effect my result and i discovered that y+ is in the logaritmic bounary layer nearly turbulant layer. In that under the circumstances inc. viscous work term can work efficiently?

thanks for your reply.

best regards.

charles.

Robin November 8, 2006 12:23

Re: Timescale Information in the Output File
 
Hi Charles,

You said your blade is moving. Did you use a rotating frame of reference, or just specify a rotation of the blade?

Regards, Robin

charles November 8, 2006 16:03

Re: Timescale Information in the Output File
 
Hi Robin, I used a rotating frame of reference and my blade is wall with no-slip boundary condition. sst was used as turb. model and total energy as heat trans. model. I realized that my y+ is 10 which in the logaritmic boundary layer near the turbulent boundary layer. I think that is viscous boundary layer will not been resolved entirely. moreover, inc. viscous work term option will not help in the accurate heat transfer and sst calculatins. if you have different comment, please share it with me.

Regards...

charles.



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