Spectral proper orthogonal decomposition and its relationship to dynamic mode decomposition and resolvent analysis

Abstract

We consider the frequency domain form of proper orthogonal decomposition (POD) called spectral proper orthogonal decomposition (SPOD). Spectral POD is derived from a space-time POD problem for statistically stationary flows and leads to modes that each oscillate at a single frequency. This form of POD goes back to the original work of Lumley (Stochastic tools in turbulence, Academic Press, 1970), but has been overshadowed by a space-only form of POD since the 1990s. We clarify the relationship between these two forms of POD and show that SPOD modes represent structures that evolve coherently in space and time while space-only POD modes in general do not. We also establish a relationship between SPOD and dynamic mode decomposition (DMD); we show that SPOD modes are in fact optimally averaged DMD modes obtained from an ensemble DMD problem for stationary flows. Accordingly, SPOD modes represent structures that are dynamic in the same sense as DMD modes but also optimally account for the statistical variability of turbulent flows. Finally, we establish a connection between SPOD and resolvent analysis. The key observation is that the resolvent-mode expansion coefficients must be regarded as statistical quantities to ensure convergent approximations of the flow statistics. When the expansion coefficients are uncorrelated, we show that SPOD and resolvent modes are identical. Our theoretical results and the overall utility of SPOD are demonstrated using two example problems: the complex Ginzburg-Landau equation and a turbulent jet.

References in corpus (11)

• On Dynamic Mode Decomposition: Theory and Applications
• A critical layer model for turbulent pipe flow
• Spectral analysis of jet turbulence
• Spectral proper orthogonal decomposition
• On coherent structure in wall turbulence
• Color of turbulence
• Model-based design of transverse wall oscillations for turbulent drag reduction
• Study of dynamics in post-transient flows using Koopman mode decomposition
• A reduced-order model of three-dimensional unsteady flow in a cavity based on the resolvent operator
• On the correspondence between Koopman mode decomposition, resolvent mode decomposition, and invariant solutions of the Navier-Stokes equations
• A low-order decomposition of turbulent channel flow via resolvent analysis and convex optimization

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