DDES Investigation of Aerodynamic Flow Control Efficiency over A Vertical Tail/Rudder Assembly*

The simulations presented here are aimed at matching the experimental conditions where a 1/9th scale vertical tail/rudder assembly was tested at Reynolds number of 0.7 M. The numerical simulations adopt a delayed detached eddy simulation (DDES) turbulence model, which is particularly well suited for this application where flow separation occurs near the junction between the stabilizer and the rudder. Specifically, the DDES model applies the RANS model on the stabilizer where the flow is fully attached. Meanwhile, the LES model is automatically triggered in the plume of jets and above most of the rudder, downstream of the hinge line where flow separation occurs due to the rudder deflection. With the access to state-of-the-art HPC, the intended study will provide the much-needed insight to understand and exploit the underlying physical mechanisms related to active flow control.