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
. 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 .