Abstract
The understanding of the large-scale dynamics of the turbulent jet in counterflow remains limited. By employing proper orthogonal decomposition and spectral proper orthogonal decomposition on large eddy simulation data, new insights are presented. The fundamental mode dynamics are described as varying penetration, precession, and an alternating stretching-contracting motion. Furthermore, intermittency in the temporal evolution of these modes is identified.
Highlights
The jet in counterflow configuration creates complex turbulent flows due to the interaction between the jet and the counterflow stream
The present study aims at addressing all the shortcomings presented regarding the dynamic behavior of turbulent counterflowing jets
Large-scale and small-scale structures are represented by two different isocontours of Q ∼ 1.5 × 104 and Q ∼ 1.8 × 105, respectively
Summary
The jet in counterflow configuration creates complex turbulent flows due to the interaction between the jet and the counterflow stream. Many applications that require high mixing efficiencies employ counterflowing jets as it has been reported to improve mixing compared to other jet configurations [1]. The jet in counterflow is characterized by chaotic and irregular patterns at a sufficiently high jet-to-counterflow velocity ratio α = Uj/U0 and Reynolds number Re. The existing knowledge of counterflowing jets has been recently reviewed by Rovira et al [2]. Their review focused on mean flow features and turbulence quantities but the nature of the instantaneous dynamics has not been addressed. A review of the main findings regarding the large-scale dynamics of the jet in counterflow will be performed
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