Affiliations: Naval Surface Warfare Center, Carderock Division, West Bethesda, MD, USA
Note: [] Corresponding author: Dr. Sung-Eun Kim, Head, Computational Hydromechanics R & D Branch (Code 572), Naval Surface Warfare Center, Carderock Division, 9500 MacArthur Boulevard, West Bethesda, MD 20817-5700, USA. Tel.: +1 301 227 1018; Fax: +1 301 227 3585; E-mail: [email protected]
Abstract: This study is concerned with the turbulent shear flow around the DARPA SUBOFF body undergoing a turning maneuver at drift. Steady Reynolds-averaged Navier–Stokes (RANS) equations were solved in a rotating frame of reference down to viscous sub-layer using two different k–ω turbulence models. Grid-convergence of the numerical solutions was ascertained using three systematically refined grids with up to 19 mln elements. The Wilcox' k–ω model predictions closely reproduce the salient features of the flow such as the cross-flow separation, the streamwise vortices, and the resultant force and moment acting on the body. The change in the effective drift angle along the body in turning strengthens cross-flow on the aft body and augments side force. It still remains a challenge to accurately resolve the sail vortex over a long distance. The computations showed measurable effects of the sting on the force and moment.
