Assessment of Wall Modeling With Adverse Pressure Gradient for High Reynolds Number Separated Flows
Résumé
This paper applies a recently developed approach for modeling turbulence near wall regions
within a lattice Boltzmann solver, in combination with a Hybrid RANS/LES turbulence
model, to study turbulent separated flows at high Reynolds numbers. To simulate unsteady
detached flows on a non-body-fitted Cartesian grid, wall models are employed to estimate
the effects of unresolved near-wall turbulence on the overall flow. The article presents the
extension of an equilibrium power law wall model to handle adverse pressure gradients and
its application in simulating external aerodynamic flows. Hybrid RANS/LES simulations
are conducted for two challenging test cases: a 3D NACA-4412 airfoil near stall and a
complex Ahmed body configuration. Comparison with a reference simulation involving
resolved boundary layers and experimental data demonstrates the strong performance
of the wall model, when considering adverse pressure gradients, in simulating turbulent
boundary layers under various conditions, ranging from fully attached to mild to high
adverse pressure gradients.
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