Transonic turbulent separated flow predictions using a two-layer turbulence model

A NAVIER-STOKES code with algebraic stress model/κ-ε two-layer turbulence model has been developed to compute the transonic turbulent flow over an axisymmetric secantogive-cylinder-boattail (SOCBT) projectile with a flat base and over an axisymmetric bump. The implicit upwind-biased algorithm with Harten's second-order upwind total variation diminishing discretization is extended to solve the higher order turbulent transport equations of the two-layer model for high accuracy and acceptable convergent rate. Computed results are compared with both the experimental data and the results using other turbulence models. It is found that improvement of the prediction and anisotropic turbulent natures, in the recirculating region downstream of the strong shock-wave boundary-layer interaction flow, can be obtained using the two-layer model of turbulence.