ZDES of an Ariane 6 PPH configuration with incidence angle using Zonal Immersed Boundary Conditions
Résumé
A numerical framework denoted as Zonal Immersed Boundary Conditions (ZIBC) has recently been developed and successfully applied to a full space launcher model namely Ariane 5 (see Weiss and Deck (C&F, 2018). One of the next development step lies in the validation and the extension of this methodology for different configurations. In particular, the robustness of the approach needs to be confirmed for unsteady numerical simulations using ZDES which is the objective of the present paper. To do so, a sub-scale Ariane 6 PPH model is computed for two transonic Mach numbers (i.e. M∞ = 0.7 and 0.9) with an angle of attack equal to 3°. In this case, the sting holding the model, the main stage and the boosters consisting in cylindrical bodies with changing areas are modelled using a classical body-fitted (BF) approach. Then, the struts linking the main stage to the boosters are reproduced by the local introduction of immersed boundary conditions as in Mochel et al. A physical analysis is performed on the basis of the wall fluctuating pressure to investigate the characteristic unsteady phenomena occurring for the specific angle of attack and the near sonic Mach number.
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