94 citations · 152 across the 13 of their papers we have counts for
6 papers · 1 filter
Objective detection of coherent vortices from instantaneous flow data
Tiemo Pedergnana, Florian Kogelbauer
Vortices are swirling regions of fluid that structure motion in gases and liquids across a wide range of scales, from laboratory-scale experiments to vast atmospheric currents. The…
An Objective Measure of Unsteadiness
Florian Kogelbauer, Tiemo Pedergnana
Unsteadiness lies at the heart of turbulent fluid dynamics, eddy formation and instabilities in flows thus making it central to both understanding and controlling fluid systems. In…
The Objective Deformation Component of a Velocity Field
Bálint Kaszás, Tiemo Pedergnana, George Haller
For an arbitrary velocity field defined on a finite, fixed spatial domain, we find the closest rigid-body velocity field to in the …
Coupling-Induced Instability in a Ring of Thermoacoustic Oscillators
Tiemo Pedergnana, Nicolas Noiray
Thermoacoustic instabilities in can-annular combustors of stationary gas turbines lead to unstable Bloch modes which appear as rotating acoustic pressure waves along the turbine an…
Modeling the nonlinear aeroacoustic response of a harmonically forced side branch aperture under turbulent grazing flow
Tiemo Pedergnana, Claire Bourquard, Abel Faure-Beaulieu +1
Hydrodynamic modes in the turbulent mixing layer over a cavity can constructively interact with the acoustic modes of that cavity and lead to aeroacoustic instabilities. The result…
Explicit Unsteady Navier-Stokes Solutions and their Analysis via Local Vortex Criteria
Tiemo Pedergnana, David Oettinger, Gabriel Provencher-Langlois +1
We construct a class of spatially polynomial velocity fields that are exact solutions of the planar unsteady Navier-Stokes equation. These solutions can be used as simple benchmark…