Hover Predictions Using a High-Order Discontinuous Galerkin Off-Body Discretization

Hover performance of a four-bladed Sikorsky S-76 is studied using a high-order discontinuous Galerkin (DG) off-body discretization. Time accurate Navier-Stokes calculations are performed using the W$^{\mathrm{2}}$A$^{\mathrm{2}}$KE3D code which combines solution technologies in a multi-mesh, multi-solver paradigm through a dynamic overset framework which employs NSU3D as a near-body solver and dg4est as an off-body solver. The rotor with swept-tapered tip is simulated. The tip Mach number was 0.65, and the Reynolds number based on the reference chord was 1.2 million. A constant coning angle of 3.5\textdegree is applied. Effect of time step size and sub-iterations on the integrated parameters are investigated. Convergence results are presented. The figure of merit is calculated and compared with available data in the literature, and good agreement is found.