3-D implicit Navier-Stokes solver for internal turbulent compressible flows

A new code aimed at the solution of three-dimensional intemal laminar and turbulent compressible flows is presented. The solution procedure is based on the scalar form of the approximate factorization method. The Navier-Stokes equations in mass-averaged form are iterated in time until a steady solution is reached. Evidence is given to the implicit treatment of diffusive terms that proved able to speed up convergence and enhance the algorithm robusmess. Turbulence effects are accounted for by the Baldwin-Lomax turbulence model and the q w two-equation model. For the first, an investigation on the model behavior in case of multiple boundaries is performed. The numerical code is validated by computing the flow in the Stanitz 90-deg tuming elbow. Finally the code is applied to the computation of the flow in the VKI LS-82 three-dimensional linear cascade.