Resolvent-based analysis of streaks in turbulent jets

Petrônio Nogueira (1) , André Cavalieri (2) , Oliver Schmidt (3) , Peter Jordan (4) , Vincent Jaunet (4) , Ethan Pickering , Georgios Rigas , Tim Colonius (5)

1 ITA - Instituto Tecnológico de Aeronáutica [São José dos Campos]
2 PPrime [Poitiers] - Institut Pprime [UPR 3346]
3 IFW Dresden - Leibniz Institute for Solid State and Materials Research
4 2AT - Acoustique, Aérodynamique, Turbulence [Institut Pprime]
5 CALTECH - California Institute of Technology

Large scale, elongated structures, similar those ones widely studied in wall-bounded flows, are also present in turbulent jets. Several characteristics of these streaks can be identified via reduced order models such as resolvent analysis. The present work involves a resolvent-based study of these structures in turbulent jets. We focus on obtaining the optimal forcing that generates these energetic coherent structures. Results are compared with experimental data post-processed using spectral proper orthogonal decomposition, allowing us to draw conclusions about the nature of the non-linear forcing, since the two analyses should provide equivalent results if this term is modelled as spatially white. By identifying streaks in a global framework, we expect to better understand the mechanism by which they are generated.

Domaines: Milieux fluides et réactifs

Petrônio Nogueira, André Cavalieri, Oliver Schmidt, Peter Jordan, Vincent Jaunet, et al.. Resolvent-based analysis of streaks in turbulent jets. 25th AIAA/CEAS Aeroacoustics Conference, May 2019, Delft, Netherlands. ⟨10.2514/6.2019-2569⟩. ⟨hal-02378569⟩