This paper proposes a Computational Fluid Dynamics (CFD) framework with the aim of combining consistency and eciency for the numerical simulation of high Reynolds number ows encountered in engineering applications for aerodynamics. The novelty of the framework is the combination of a Reynolds-Averaged NavierStokes (RANS) model with an anisotropic mesh adaptation strategy handling arbitrary immersed geometries by building the corresponding boundary layer meshes. The numerical algorithm consists of robust and accurate solution of the unsteady incompressible NavierStokes equations supplemented with a SpalartAllmaras turbulence model and boundary layer remeshing relying on a specically designed metric. The ow solver is formulated as a Variational Multiscale (VMS) nite element method for the momentum balance and the incompressibility constraint, and as an upwind PetrovGalerkin method for the nonlinear turbulent equation. The boundary layer remeshing strategy is exible as it allows the adaptation of arbitrary coarse meshes by modifying the size and the orientation of elements along the immersed boundary to ensure a smooth gradation along the curvature of the body's geometry. The solver is capable of handling highly stretched anisotropic elements and is shown to successfully predict both mean and uctuating drag/lift coecients. Laminar and turbulent test cases in 2D and 3D are presented to assess the performance of this framework against experimental results relevant to external aerodynamics, including an airship and a ying drone.

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