Development of a Novel Mixing Plane Interface Using a Fully Implicit Averaging for Stage Analysis

Abstract

This paper describes the development and validation steps of a characteristicsbased explicit along with a novel fully implicit mixing plane implementation for turbomachinery applications. The framework is an unstructured 3D RANS inhouse modified solver, based on opensource libraries. Particular attention was paid to massconservation, accurate variables interpolation, and algorithm stability in order to improve robustness and convergence. By introducing a specific interface, allowing the use of algebraic multigrid solvers together with multiprocessor computation, a speed up of the numerical solution procedure was achieved. The validation of both mixing plane algorithms is carried out on an industrial radial compressor and a cold air 1.5 stages axial turbine.