Then you have a sufficient number of time steps to compute the RMS without transient data. Continue to run the software until the window averaging of the FFTs converge to a constant signature. As you add each window and then average, if the frequency signature changes considerably, then you have not eliminated the transients. Perform an FFT on each window, then sum and average each FFT together to get one window. Tecplot 360 is the most advanced reservoir simulation visualization and analysis software available today. Tecplot is a set of visualization and analysis tools that can manage large data sets, automate workflows, and visualize parametric results. If you have 100,000 time steps, try 25,000 time steps each, where the first window is 1-25k, the second is 12.5k-37.5k, the third is 25k-50k, the fourth is 37.5k-62.5k, etc. Tecplot: A Powerful Visualization And Analysis Tool For Oil & Gas Professionals. Simply take your time accurate data set (preferably second order accurate in time) and divide it into windows of equal size. I recommend looking at Welch's method for windowing. In theory, if the window size is sufficiently sized, there will be very little variance between each window. To do the FFT, you'll want to use multiple segments of the data that over lap. The second is to perform a Fast Fourier Transform (FFT) analysis of the data. The first is an RMS (root mean square) of whatever parameter you are targeting. The best way I've seen this done is to compute two quantities. Tecplot engineering plotting software is designed for measured field data, performance plotting of test data, mathematical analysis, and general engineering. One of the more perplexing issues is determining if the transient data is eliminated from your data when computing the mean.
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