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-   -   saving transient data for 1 point & 1 variable (http://www.cfd-online.com/Forums/cfx/21918-saving-transient-data-1-point-1-variable.html)

REH December 7, 2005 15:24

saving transient data for 1 point & 1 variable
 
I would like to save the velocity data for a single node over a series of time steps so that I can take a FFT and find the frequency of oscillation using CFX 10.0. Can anyone help me with this?

Rui December 7, 2005 16:27

Re: saving transient data for 1 point & 1 variable
 
In Post, create a Chart. On the Chart tab select Type = Time, on the Chart Line tab select the Location (a Point that you have to already had created) and select the Variable. You'll get a graphic with the Variable values at the time instants available in Post. You may export the data.

If you want to have the data at every timestep, in Pre create a Monitor Point.

Regards,

Rui

Mike December 7, 2005 16:35

Re: saving transient data for 1 point & 1 variable
 
You could also create a Monitor Point for Velocity at the point of interest. Pull up the plot for the monitor point history in the Solver Manager, right-click on the plot and select "Export Plot Data". This will allow you to export a csv (comma separated value) file that Excel can open up. Mike


TB December 8, 2005 03:19

Re: saving transient data for 1 point & 1 variable
 
I'll create a monitor pt in post and export the data to a text file using command line in command window. I shouldn't be hard as post adopted PERL language.

Of course you can try Rui's method but I never like the way Post do the 2D graph....


REH December 8, 2005 11:44

Re: saving transient data for 1 point & 1 variable
 
Thanks for all the help, I was able to export the data.

RH


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