Laurent Daumas, Nicolas Forestier, Aloïs Bissuel, Gabriel Broux, Frédéric Chalot, Zdenek Johan, Michel Mallet

DOI Number: N/A

Conference number: IFASD-2017-050

Linearized CFD solvers are commonly used at DASSAULT AVIATION to predict unsteady aerodynamic pressure fields on an aircraft in the transonic flow regime. This paper shows that accounting for the gradient of the Reynolds stress tensor is of major importance to predict the aerodynamic behavior of the aircraft from subsonic to transonic domain (including separated flows). This paper presents the strategy used to develop an approach coupling the linearized Navier-Stokes equations and the linearized turbulent system in the frequencydomain based on the in-house finite element AETHER code. The turbulence modelling is achieved through the Spalart-Allmaras model. This coupled approach is validated using data of a wind tunnel campaign performed at ONERA S2MA and by comparison with timedomain non-linear computations. Finally, the industrial capability of the frequency-domain linearized Navier-Stokes solver with linearized turbulence is illustrated through applications on the FALCON 7X and RAFALE fighter.

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In Categories: 1.Events, IFASD 2017, Steady/Unsteady Aerodynamics
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