Communication Dans Un Congrès Année : 2025

A modelling strategy for log-layer mismatch in channel flows

Résumé

In continuous Hybrid RANS-LES (HRL) methods, the switch from RANS to LES is prescribed by a continuous function that reduces the turbulent viscosity, leading to the development of resolved motion, ideally, sufficiently quickly such that the total turbulent stresses (modelled + resolved) are conserved. However, the reliance of developing unsteady motions only due to flow instabilities is too slow which leads to a large deficit in the total mechanical energy and total stresses, which is at the origin of both the modelled stress depletion and log-layer mismatch issues. In this work, a HRL model is augmented with an active forcing strategy such that these effects are diminished. The proposed active methodology can be applied to any continuous HRL model where a function driving the switch between RANS and LES can be identified.

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Dates et versions

hal-05245470 , version 1 (08-09-2025)

Identifiants

  • HAL Id : hal-05245470 , version 1

Citer

Puneeth Bikkanahally, Remi Manceau. A modelling strategy for log-layer mismatch in channel flows. THMT 2025 - 11th International Symposium on Turbulence, Heat and Mass Transfer, International Centre for Heat and Mass Transfer (ICHMT); The Heat Transfer Society of Japan (HTSJ), Jul 2025, Tokyo, Japan. ⟨hal-05245470⟩
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