Investigation of Numerical Simulation Challenges of Transonic Flow in 2D Turbomachines Cascades

The 2D cascade is a simplified model which is used to reduce the grid size and consequently numerical computation time. Selection of cascade model for result validation, modeling of cascade geometry, modeling of flow domain, selection of appropriate boundary conditions, efficient grid generation and solver selection are among challenges of numerical simulation of transonic flow past 2D cascades. This challenges leads to researchers mind confusion. In this paper, these challenges and related appropriate strategies will be explained. Results show that using of coupled pressure based algorithm is an efficient way to simulate of transonic flow in turbomachines. Furthermore, need to using static pressure near peak efficiency and mass flow rate near stall as outlet boundary condition is proven. Impossibility of using periodic condition in most cascades is another results of this research.