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Eulerian-Lagrangian method for simulation of cloud cavitation
Kazuki Maeda, Tim Colonius
We present a coupled Eulerian-Lagrangian method to simulate cloud cavitation in a compressible liquid. The method is designed to capture the strong, volumetric oscillations of each…
Spectral analysis of jet turbulence
Oliver T. Schmidt, Aaron Towne, Georgios Rigas +2
Informed by LES data and resolvent analysis of the mean flow, we examine the structure of turbulence in jets in the subsonic, transonic, and supersonic regimes. Spectral (frequency…
Modal decomposition of fluid-structure interaction with application to flag flapping
Andres Goza, Tim Colonius
Modal decompositions such as proper orthogonal decomposition (POD), dynamic mode decomposition (DMD) and their variants are regularly used to educe physical mechanisms of nonlinear…
Jet-edge interaction tones
Peter Jordan, Vincent Jaunet, Aaron Towne +4
Motivated by the problem of jet-flap interaction noise, we study the tonal dynamics that occur when a sharp edge is placed in the hydrodynamic nearfield of an isothermal turbulent…
Global modes and nonlinear analysis of inverted-flag flapping
Andres Goza, Tim Colonius, John Elie Sader
An inverted flag has its trailing edge clamped and exhibits dynamics distinct from that of a conventional flag, whose leading edge is restrained. We perform nonlinear simulations a…
Spectral proper orthogonal decomposition and its relationship to dynamic mode decomposition and resolvent analysis
Aaron Towne, Oliver T. Schmidt, Tim Colonius
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…