• about LES/RANS hybrid methodology
• current research focus
• past major research
results: instantaneous base flow prediction
Figures shown below are end views of instantaneous Mach number distributions behind the base computed by the LES/RANS hybrid method (left) and a planar flow visualization image obtained experimentally by Bourdon and Dutton using Mie scattering imaging technique (right) at almost the same position of the computational result.
The computed turbulent structure caused by the instability of the shear layer shows the formation of mushroom-shaped patterns in the free shear layer. Similar structures are also observed in the experiment of Bourdon and Dutton. These results show the capability of the present LES/RANS hybrid methodology for the prediction of unsteady flow features in contrast to unsteady RANS computation which shows little unsteadiness in the flow due to the large turbulent eddy viscosity behind the base-edge separation originated from the nature of the method.
|
LES/RANS
hybrid methodology |
experiment of Bourdon
& Dutton |
 prev. |
