[PDF] Top 20 Optimal perturbations in a time-dependent round jet

... Optimal perturbations in a time-dependent round jet Gabriele Nastro 1 , Jérôme Fontane 1 and Laurent Joly 1 1 Institut Supérieur de l'Aéronautique et de l'Espace ... Voir le document complet

... perform a global stability analysis over the whole unsteady evolution from the initially parallel jet flow to the roll-up of the KH vortex rings in order to determine the secondary instabilities of ... Voir le document complet

... of round jets for varying aspect ratios ↵ = R/✓, where R is the jet radius and ✓ the shear layer momentum thickness, for Reynolds numbers ranging from 10 to 10 ...1) perturbations depending on the ... Voir le document complet

... of round jets for varying aspect ratios ↵ = R/✓, where R is the jet radius and ✓ the shear layer momentum thickness, for Reynolds numbers ranging from 10 to 10 ...1) perturbations depending on the ... Voir le document complet

... consists in actually canceling the Kelvin-Helmholtz vortices that are directly involved in the pairing phenomenon and the noise generation, by means of streamwise vortices ...an optimal perturbation ... Voir le document complet

... jet flows, 34 which suggests that the use of the non-modal dis- turbances may actually provide a satisfactory characterization of jet control ...strategy, a complete analysis of the potential ... Voir le document complet

... of round jets for varying aspect ratios ↵ = R/✓, where R is the jet radius and ✓ the shear layer momentum thickness, for Reynolds numbers ranging from 10 to 10 ...1) perturbations depending on the ... Voir le document complet

... done in the homogeneous mixing layer (Rogers & Moser 1992 ). A first attempt was made by Joly, Suarez & Chassaing ( 2003 ) to quantify the modifications of the strain field in light jets and ... Voir le document complet

... stretched in the streamwise direction, so that the two structures placed on the flanks of the low-momentum region approach one another in their downstream ...part. A vortex filament oriented ... Voir le document complet

... it a Hilbert ...If A is an adapted process with bounded variation then V ar(A) ...1 in [15]. In particular for almost all ω ∈ Ω, t 7→ V ar t (A(ω)) is the total variation ... Voir le document complet

... developments in the crop protection field have led to different nozzles designs: Hydraulic nozzles, which are widely used, produce a liquid sheet followed by ligaments that lead to droplets of various ... Voir le document complet

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... initial perturbations. Although more accurate models are embeded in ICF simulation codes, this approach consists in computing solutions to an initial and boundary value problem (IBVP) for selected ... Voir le document complet

... 4. Time-dependent solutions for an atmosphere in solid rotation ...introduce a solid body rotation by moving the at- mosphere with a constant angular velocity with respect to the ... Voir le document complet

... Introduction Time Petri nets (TPN for short) have been introduced by Merlin in 1974 to ex- tend the modelling and analysis powers of Petri nets to time dependent ...of time constraints ... Voir le document complet

... (1995) in the one-dimensional case, it seems to have been ignored or forgotten, ...used in practice even if it has been shown that the geometric Brownian motion model is an inadequate model for the ... Voir le document complet

... core in‡ation and imported in‡ation is of order ...; A; A z ; B) of the policy transmission ...ing in‡ation is predetermined or for Ramsey optimal policy where in‡ation is ... Voir le document complet

... contains a term of the form sin( ∆E)/E which eventually converges to a dirac function) so that practical calculations are greatly facilitated by the use of ...to a one-dimensional conductor The study ... Voir le document complet

... setups. In the first set of experiments, the DCB specimens were par- tially debonded through a quasi-static fracture test at room ...temperature. A stainless steel wedge with a nominal thick- ... Voir le document complet

... used in physics, we first link them with the trees commonly found in graph ...by a much easier one. A common tree is a connected graph without ...loops. In other words, a ... Voir le document complet