Numerical Simulation of Two-dimensional Incompressible Flow in Turbomachinary Cascades With Detached Eddy Simulation

The aim of this research is to study effective parameters of incompressible، viscous and unsteady flow in Turbomachinary cascades using the Spalart-Allmaras (SA) RANS-Based Delayed Detached Eddy Simulation method. Detached Eddy Simulation is a hybrid RANS-LES method that was purposed in order to reduce LES computational cost. In this method، near wall، in boundary layer، RANS turbulence model is used and away from the wall، method automatically switches to LES. To develop original DES method (DES97)، DDES was purposed to solve modeled stress depletion problem. A new function is introduced to the DDES model to make the transition from RANS to LES grid cell size independent. The numerical method that is used for discretization is staggered finite-volume and the grid is Cartesian. Also hybrid differencing scheme (the scheme compound of central differencing scheme and upwind scheme) to discretization of convection terms in Navier-Stokes is used. The results of this study compared with the results of simulation with SA turbulence model.