Abstract
Triadic interactions are the fundamental mechanism of energy transfer in fluid flows. This work introduces bispectral mode decomposition as a direct means of educing flow structures that are associated with triadic interactions from experimental or numerical data. Triadic interactions are characterized by quadratic phase coupling which can be detected by the bispectrum. The proposed method maximizes an integral measure of this third-order statistic to compute modes associated with frequency triads, as well as a mode bispectrum that identifies resonant three-wave interactions. Unlike the classical bispectrum, the decomposition establishes a causal relationship between the three frequency components of a triad. This permits the distinction of sum- and difference-interactions, and the computation of interaction maps that indicate regions of nonlinear coupling. Three examples highlight different aspects of the method. Cascading triads and their regions of interaction are educed from direct numerical simulation data of laminar cylinder flow. It is further demonstrated that linear instability mechanisms that attain an appreciable amplitude are revealed indirectly by their difference-self-interactions. Applicability to turbulent flows and noise-rejection is demonstrated on particle image velocimetry data of a massively separated wake. The generation of sub- and ultra-harmonics in large eddy simulation data of a transitional jet is explained by extending the method to cross-bispectral information.
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Acknowledgements
I would like to thank Tim Colonius for pointing me to higher-order spectra, Ethan Pickering for pointing out the need to compute difference-interactions, Aaron Towne, Peter Schmid, Georgios Rigas and Tim Colonius for many helpful discussions, and the two anonymous referees for their very insightful comments. I gratefully acknowledge Karen Mulleners for providing the PIV data, Guillaume Brès for the LES data, and Andres Goza for helping with the DNS.
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Appendices
Appendix A: Computation of \(\mathbf{a }_1= \text {arg max}_{\Vert \mathbf{a }\Vert =1}|\mathbf{a} ^*\mathbf{B }\mathbf{a }|\)
A slightly modified version of the algorithm for the computation of the numerical radius by He and Watson [24] is used. He and Watson’s algorithm requires two nested iterations. The first, or so-called simple iteration [60], converges to a local solution of Eq. (56). A tolerance of \( tol =10^{-8}\) was found to be a good compromise between accuracy and compute time for both iterations. The number of iterations was limited to \(k=300\).
Building on the simple iteration to find local solutions, the purpose of the main algorithm is to find the global solution. Double precision arithmetic with machine precision \(\epsilon =2^{-52}\) was used to compute the results in Sect. 4. If the algorithm did not converge within 500 iterations, it was restarted up to five times with a new random initial guess for \(\mathbf{a} _0\). This procedure was necessary to ensure that all results are fully converged.
Appendix B: Convergence
Figure 16 demonstrates the convergence of all three cases discussed in Sect. 4 in terms of summed mode spectra. The convergence of the results is tested by recomputing the BMD for smaller subsets of the available data. In particular, Fig. 16a shows that the summed mode spectrum obtained for the first 3 and 5 blocks of the cylinder flow DNS data is very similar to the one obtained for all 7 block. Similarly, the full data of the flat plate PIV and the jet LES are compared to the spectra obtained for approximately one-third and two-thirds of the full data in Fig. 16b and c, respectively. It can be seen that the summed mode spectra for the latter cases, too, remain largely unaltered by the data reduction. The summed mode spectrum was chosen as the most compact representation of the results. A comparison of the bispectral modes and mode bispectra (not shown) obtained from the full and reduced data sets confirmed that the results are also well-converged with respect to mode spectra and mode shapes.
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Schmidt, O.T. Bispectral mode decomposition of nonlinear flows. Nonlinear Dyn 102, 2479–2501 (2020). https://doi.org/10.1007/s11071-020-06037-z
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DOI: https://doi.org/10.1007/s11071-020-06037-z