5 papers · 1 filter
Band-Ensemble Spectral Proper Orthogonal Decomposition with Frequency Attribution
Jakob G. R. von Saldern, Oliver T. Schmidt, Philipp Godbersen +2
This study presents band-ensemble Spectral Proper Orthogonal Decomposition (bSPOD). The approach is inspired by frequency smoothing, a method used to reduce estimator variance in p…
MFC 5.0: An exascale many-physics flow solver
Benjamin Wilfong, Henry A. Le Berre, Anand Radhakrishnan +16
Many problems of interest in engineering, medicine, and the fundamental sciences rely on high-fidelity flow simulation, making performant computational fluid dynamics solvers a mai…
Bispectral decomposition and energy transfer in a turbulent jet
Akhil Nekkanti, Ethan Pickering, Oliver T. Schmidt +1
We employ bispectral mode decomposition (BMD) to investigate coherent triadic interactions and nonlinear energy transfer in a subsonic turbulent jet. BMD extracts the flow structur…
Velocity gradient partitioning in turbulent flows
Rahul Arun, Tim Colonius
The velocity gradient tensor can be decomposed into normal straining, pure shearing and rigid rotation tensors, each with distinct symmetry and normality properties. We partition t…
Nonlinear dynamics of vortex pairing in transitional jets
Akhil Nekkanti, Tim Colonius, Oliver T. Schmidt
This study investigates the onset of linear instabilities and their later nonlinear interactions in the shear layer of an initially-laminar jet using a combination of stability ana…