Progress in the development of a versatile ZDES-based methodology for aerospace flows
Résumé
In the aerospace field, a growing need for reactivity has arisen due to the competition in the design of new space launchers such as reusable launch vehicles. In this context, the development and the validation of advanced numerical strategies is of primary importance to allow the quantitative simulation of the physical phenomena driving the multi-scale physics of turbulent flows around complex geometries. The present paper aims to illustrate the use of an innovative numerical framework denoted as Zonal Immersed Boundary Conditions (ZIBC) [10], [21] to unveil the salient unsteady features of a sub-scale Ariane 6 PPH model. The numerical strategy allowing the coupling between a modelling method (e.g. RANS, URANS, ZDES, LES or DNS) and IBC (Immersed Boundary Conditions) is reminded. The high level of maturity of the Zonal Detached Eddy Simulation (ZDES) [2, 4] is presently used in the ZIBC strategy for the prediction of turbulent separated flows and permits to simulate complex configurations dealing with internal or external aerodynamics. A deep physical analysis based on single-and two-point spectra reveals an a priori unexpected change of phenomenology comparing the configuration of interest for two transonic Mach numbers namely M ∞ = 0.7 and 0.9 with the same angle of attack equal to −3 •. In particular, the PSD of the normal force coefficient integrated from the nose to the base (which is excluded) of the configuration clearly illustrates that the flow dynamics is driven by phenomena related to one and two characteristic frequencies for M ∞ = 0.7 and 0.9, respectively.
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