Implementation of the Spalart–Allmaras turbulence model in a finite-volume gas-dynamic solver

A numerical finite-volume method of solving averaged Navier–Stokes equations closed by a one-parameter Spalart–Allmaras turbulence model is discussed. The proposed method is implemented within the framework of the HyCFS numerical code and is verified through comparisons of the HyCFS numerical solutions with those predicted by the CFL3D and FUN3D numerical codes. Three test cases are considered: flow past a flat plate, flow past a flat plate with a roughness element, and flow in a cocurrent jet. It is shown that the numerical solutions obtained are in good agreement with each other. The numerical data on the flow velocity in the mixing layer are compared with experimental results.