Mechanics of bluff body drag reduction during transient near-wake reversals

Y Haffner, J Borée, A Spohn… - Journal of Fluid …, 2020 - cambridge.org
A combination of passive and active methods is used to manipulate the symmetry of the
turbulent wake of an Ahmed body. Dedicated experiments to study the wake reversals …

Assessment of LES, IDDES and RANS approaches for prediction of wakes behind notchback road vehicles

K He, G Minelli, J Wang, G Gao, S Krajnović - Journal of Wind Engineering …, 2021 - Elsevier
Abstract The capability of Large Eddy Simulations (LES), Improved Delayed Detached Eddy
Simulations (IDDES) and Reynolds-Averaged Navier–Stokes Equations (RANS) to predict …

Effect of base blowing by a large-scale fluidic oscillator on the bistable wake behind a flat-back Ahmed body

D Veerasamy, AR Tajik, L Pastur, V Parezanović - Physics of Fluids, 2022 - pubs.aip.org
The dynamics of the wake behind a flat-back Ahmed body are modified using a large-scale
fluidic oscillator, aiming at drag reduction and the reflectional symmetry breaking (RSB) …

Simulations of the bi-modal wake past three-dimensional blunt bluff bodies

L Dalla Longa, O Evstafyeva… - Journal of Fluid …, 2019 - cambridge.org
The bi-modal behaviour of the turbulent flow past three-dimensional blunt bluff bodies is
simulated using wall-resolved large eddy simulations. Bi-modality (also called bi-stability) is …

Wake transitions and steady-instability of an Ahmed body in varying flow conditions

Y Fan, V Parezanović, O Cadot - Journal of Fluid Mechanics, 2022 - cambridge.org
The paper investigates experimentally the flow past a flat-back, taller than wide Ahmed body
having rectangular base aspect ratio defined from regions where the mean lateral force …

Numerical investigation of the wake bi-stability behind a notchback Ahmed body

K He, G Minelli, J Wang, T Dong, G Gao… - Journal of Fluid …, 2021 - cambridge.org
Large-eddy simulations are used to investigate the origin of the wake asymmetry and
symmetry behind notchback Ahmed bodies. Two different effective backlight angles,, are …

Evolution of the bi-stable wake of a square-back automotive shape

G Pavia, M Passmore, C Sardu - Experiments in Fluids, 2018 - Springer
Square-back shapes are popular in the automotive market for their high level of practicality.
These geometries, however, are usually characterised by high drag and their wake …

Salient three-dimensional features of the turbulent wake of a simplified square-back vehicle

G Pavia, MA Passmore, M Varney… - Journal of Fluid …, 2020 - cambridge.org
In this paper, the unsteady wake of a simplified square-back vehicle, with and without
wheels, is investigated using large-scale tomographic particle image velocimetry, at a …

Experimental analysis of the effect of local base blowing on three-dimensional wake modes

M Lorite-Díez, JI Jiménez-González… - Journal of Fluid …, 2020 - cambridge.org
Wake modes of a three-dimensional blunt-based body near a wall are investigated at a
Reynolds number states in the horizontal (respectively vertical) direction, while bistable …

Galerkin force model for transient and post-transient dynamics of the fluidic pinball

N Deng, BR Noack, M Morzyński… - Journal of Fluid …, 2021 - cambridge.org
We propose an aerodynamic force model associated with a Galerkin model for the unforced
fluidic pinball, the two-dimensional flow around three equal cylinders with one radius …