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-   -   RSM value of fluctuating component of velocity (http://www.cfd-online.com/Forums/cfx/25627-rsm-value-fluctuating-component-velocity.html)

Kushagra April 9, 2008 14:55

RSM value of fluctuating component of velocity
 
Hi, I want to plot the rms value of fluctuating component of velocity. What variable should I select in CFX-Post? Please help. Thanks Kushagra

Usman April 9, 2008 17:12

Re: RSM value of fluctuating component of velocity
 
Hi Kushagra

Did you write statistics in CFX-Pre? If you have then you would find Velocity rms in variables list in CFX-Post.

Usman

Kushagra April 9, 2008 17:24

Re: RSM value of fluctuating component of velocity
 
Thanks Usman. Yes I wrote the statistic in CFX-Pre. But I am talking about the rms value of fluctuating component (u',v',w') not the mean value component (U,V,W). Which variable would represent the fluctuating component? Please suggest. Thanks, Kushagra


Usman April 10, 2008 05:26

Re: RSM value of fluctuating component of velocity
 
Kushagra you should find in the list of you variables "Velocity trn rms" and then respective components below it. This is what you need to plot rms values.

I hope you had selected rms values when you wrote statistics and not the mean values?

Usman

Bart April 10, 2008 08:32

Re: RSM value of fluctuating component of velocity
 
Wait, are you talking about turbulent fluctuations or the deviation from average values in a RANS transient run? The latter can be send to output when doing a transient run by specifying in the value list for your .trn files. CFX will not give you the turbulent fluctuations of the velocity components (it's a RANS code), I think.

Bart

Kushagra April 10, 2008 15:20

Re: RSM value of fluctuating component of velocity
 
thanks very much Usman. It helps. Kushagra


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