Power spectrum calculations using the fast Fourier transform
In the analysis of turbulent flow, the evaluation of simulations is difficult because the results are three-dimensional and transient. We have found that analysis of the power spectra from the nodal time histories provides not only insight into the behavior of the flow, but it is a useful tool in determining the solution`s spatial (grid) and temporal (time step) convergence. We have developed a method and computer code for calculating the power spectrum for any set of equal-interval data. The code is called PWRSPEC. This report documents the method used to calculate the power spectrum, provides guidance on how to use the PWRSPEC code, and includes an example problem that was used for code validation.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 188886
- Report Number(s):
- UCRL-ID-122544; ON: DE96001835; TRN: 96:001399
- Resource Relation:
- Other Information: PBD: 5 Dec 1995
- Country of Publication:
- United States
- Language:
- English
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