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Article Dans Une Revue Computers and Fluids Année : 2021

On the coupling of wall-model immersed boundary conditions and curvilinear body-fitted grids for the simulation of complex geometries

Résumé

One of the main limitations in computational aerodynamics lies in the ability of CFD solvers to handle complex geometries while maintaining their accuracy. Among the currently available strategies, the Zonal Immersed Boundary Conditions (ZIBC) has shown its capability to introduce complex geometrical details for the simulations of high Reynolds turbulent flows. In this context, this work aims to extend the ZIBC framework, initially adapted to reproduce blockage effects, to take into account configurations where the influence of spatially developing boundary layers has to be accurately predicted. For this purpose, a compact sharp interface immersed boundary method has been developed for curvilinear grids. Moreover, a Thin Boundary Layer Equations (TBLE) wall model based on one-dimensional RANS Spalart-Allmaras equations is coupled with the IBC to model the inner part of compressible turbulent boundary layers. The coupling with the Zonal Detached Eddy Simulation (ZDES) approach is improved and permits to simulate turbulent flows capturing accurately the wall-normal gradients with a limited grid resolution. This strategy is applied to the simulation of a generic missile configuration (FG5) with an angle of attack of 10° using RANS and ZDES approaches. For the first time, wall quantities such as unsteady loads, including the viscous contribution, are accuratly reproduced on surfaces modelled with IBC using hybrid RANS/LES (ZDES) computations and for a realistic configuration at high Reynolds number. Such a reconstruction of physical quantities at the wall is achieved thanks to a precise reconstruction procedure using a TBLE wall model.

Dates et versions

hal-04090240 , version 1 (05-05-2023)

Identifiants

Citer

Lucas Manueco, Pierre-Élie Weiss, Sébastien Deck. On the coupling of wall-model immersed boundary conditions and curvilinear body-fitted grids for the simulation of complex geometries. Computers and Fluids, 2021, 226, pp.104996. ⟨10.1016/j.compfluid.2021.104996⟩. ⟨hal-04090240⟩
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