Convert Time Series to frequency series.

vari · June 16, 2016, 22:34

Hello,

I am using star ccm+ to calculate heave and pitch motions of a catamaran.The output plot is in time series. But, my teacher wants it in frequency series. I.e., I need to plot heave RAO and pitch RAO v/s encounter frequency. Can anybody help me with on as to how to proceed with this?

fluid23 · June 17, 2016, 10:07

You can perform a fast Fourier transform (FFT) on your data to convert from time domain to frequency domain. I believe that Star-CCM has an FFT option although I have never used it. You can also export your time domain data and transform it outside Star if necessary.

June 16, 2016, 22:34	Convert Time Series to frequency series.	#1
vari New Member Ari Join Date: May 2015 Posts: 6 Rep Power: 11	Hello, I am using star ccm+ to calculate heave and pitch motions of a catamaran.The output plot is in time series. But, my teacher wants it in frequency series. I.e., I need to plot heave RAO and pitch RAO v/s encounter frequency. Can anybody help me with on as to how to proceed with this?

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June 17, 2016, 10:07		#2
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 18	You can perform a fast Fourier transform (FFT) on your data to convert from time domain to frequency domain. I believe that Star-CCM has an FFT option although I have never used it. You can also export your time domain data and transform it outside Star if necessary.