A Preliminary Validation of the RANS Code TASCflow Against Model Scale Submarine Hydrodynamic Data

A preliminary evaluation of the RANS code CFX-TASCflow for predicting the hydrodynamic forces on a fully appended submarine at a Reynolds number of 20 million is described. Except for drag, TASC flow makes good predictions of the overall forces up to moderate incidence angles using wall functions with a 371,000 node grid. At high incidence angles the predictions break down due to inadequate modeling of separation and shed circulation. The predictions improve with a finer grid and different turbulence models. Drag predictions improve when the boundary layer is modelled in place of wall functions.