BI-STABLE STATES IN THE WAKE OF A 35 ◦ AHMED BODY AT YAW
Conference contribution, 2017

Recent experimental observations by in the wake of a 35 ◦ back slant Ahmed body reveal the exis- tence of two stable states when the body is yawed [1]. The two flow states, flow state I and flow state II, are confirmed numerically by using the partially-averaged Navier–Stokes (PANS) formu- lation on unstructured meshes. Flow state I corre- sponds to a low drag/low lift state with the flow being fully separated, while flow state II corre- sponds to a high drag/high lift state, with the flow separating and reattaching over the back slant. For the Ahmed body at zero yaw angle (β = 0 ◦ ), flow state I is observed. This flow state is observed as the yaw angle is increased up to |β| ≃ 12.5 ◦ . As the yaw angle is increased beyond |β| = 12.5 ◦ , flow state II is observed. These findings are in good comparison with the experimental observa- tions of [1].

Author

Anirudh Narayan Rao

Chalmers, Applied Mechanics

Guglielmo Minelli

Chalmers, Applied Mechanics, Fluid Dynamics

Branislav Basara

Chalmers, Applied Mechanics, Fluid Dynamics

Sinisa Krajnovic

Chalmers, Applied Mechanics, Fluid Dynamics

Int. Conf. on Jets, Wakes and Separated Flows

Subject Categories

Mechanical Engineering

Fluid Mechanics and Acoustics

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

More information

Latest update

1/29/2018