velocity spectra using xmgrace -- CFD Online Discussion Forums

February 4, 2013, 18:42	velocity spectra using xmgrace	#1
satyajeet13 New Member Satyajeet Join Date: Jun 2012 Location: Waterloo, ON, Canada Posts: 3 Rep Power: 13	Hi all, I have time series plot for individual components of the velocity at a point. I want to get a velocity spectra out of it. I used xmgrace's Fourier Transform tool to get the DFT from the plot (with the transients removed). But I am unsure about the units on the axis and the procedure i am following. I want to get the x-axis in frequency. I am using the instantaneous values of velocities. I am unsure if I should use the velocity fluctuations, then get the turbulent kinetic energy and then perform the DFT. Please comment.

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