Abstract
The contribution deals with the application of coupled implicit solver for compressible flows to CFD analysis of a twin scroll radial turbine. The solver is based on the finite volume method, convective terms are approximated using AUSM+up scheme, viscous terms use central approximation and the time evolution is achieved with lower-upper symmetric Gauss-Seidel (LU-SGS) method. The solver allows steady simulation with the so called frozen rotor approach as well as the fully unsteady solution. Both approaches are at first validated for the case of ERCOFTAC pump [1]. Then the CFD analysis of the flow through a twin scroll radial turbine and the predictions of the efficiency and turbine power is performed and the results are compared to experimental data obtained in the framework of Josef Božek – Competence Centre for Automotive Industry.
Highlights
CFD simulations play an important role in turbomachinery design and analysis
Most software packages for the simulation of compressible flows are based on finite volume approach and use either a segregated or a coupled approach
The case was previously studied by [13] assuming incompressible flow and detailed data together with numerical results were published in the form of validation test case for evaluation of rotor-stator interaction
Summary
There are a number of ready-made software packages (both commercial and inhouse), the reliable simulations remains still a challenging task especially in the case of high rotational speed radial turbines or low-pressure stages of axial turbines. The flow passing through such types of turbines achieves high Mach number and has to considered as compressible. Most software packages for the simulation of compressible flows are based on finite volume approach and use either a segregated or a coupled approach. The segregated solvers have been extended to compressible flow problems including transonic or supersonic flows [4] or [5]), the efficiency of these method is in the case of high speed flows usually worse than the efficiency of implicit fully coupled solvers [6] The segregated solvers have been extended to compressible flow problems including transonic or supersonic flows (see e.g. [4] or [5]), the efficiency of these method is in the case of high speed flows usually worse than the efficiency of implicit fully coupled solvers [6]
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