Communication Dans Un Congrès Année : 2026

Towards self-adaptivity in hybrid RANS/LES

Résumé

The Hybrid RANS/LES approach is simply based on the idea of combining the advantages of RANS and LES methods, with the goal of achieving CELES (Continuous Embedded LES). This approach reserves LES for only a restricted region of the flow, surrounded by a vast RANS region, with a continuous transition between the two methods. However, in this type of approach, it is the user who determines these regions by refining the mesh in areas where his experience indicates a switch to LES mode is necessary. Two different users will make different choices and ultimately obtain different results. To avoid this user dependency, we propose an automated approach, where the regions requiring a switch to LES mode are determined based on physical criteria evaluated by an initial RANS calculation, and a remeshing is performed to refine these regions and trigger the switch to LES mode. The remeshing must preserve the constraints of RANS meshes, particularly their refinement and anisotropy near walls, and transition to a fine and more isotropic mesh in LES zones. The physical switching criteria can then be iteratively reassessed during successive hybrid calculation/remeshing cycles. The results obtained are very encouraging and notably demonstrate the convergence of the algorithm toward a user-independent solution.

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Dates et versions

hal-05630421 , version 1 (22-05-2026)

Identifiants

  • HAL Id : hal-05630421 , version 1

Citer

Remi Manceau. Towards self-adaptivity in hybrid RANS/LES. Second Workshop on Meshing and Turbulence, Safran Tech, May 2026, Châteaufort, France. ⟨hal-05630421⟩
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