Session: 34-01 High-fidelity CFD – turbines

Paper Number: 151123

Transonic Flow Through a Low-Pressure Turbine Cascade Using a Local Discontinuous Galerkin Flux Reconstruction 

This work introduces a Direct Numerical Simulation (DNS) study of transonic flow through a low-pressure turbine cascade, employing the Discontinuous Galerkin Flux Reconstruction (DG-FR) method. This work aims to provide a detailed and comprehensive analysis of the numerical setup and corresponding results.

This paper focuses on the implemented shock capturing method within the frame-work of the PyFR open-source flow solver and it explores how the DG-FR method can effectively handle the complexities associated with shocks-boundary layer interaction, which are of fundamental importance in transonic flows. The applied treatments to the boundaries of the computational domain are also analyzed and discussed. Lastly, the proposed DNS setup, and its results, with those obtained using a commercial software widely used in the computational fluid dynamics (CFD) community, are compared. The comparisons performed hereby serve to evaluate the differences between the two proposed approaches, and understand the importance of using higher fidelity simulations within this context. 

The findings presented in this paper offer valuable insights into the correct methodology for leveraging DNS simulations within the DG-FR framework. These insights are particularly useful for researchers and engineers who work in the field of turbomachinery, as they provide a solid understanding for predicting the behavior of transonic flows in low-pressure turbine cascades with high fidelity tools.

Presenting Author: Francesco Mario D'afiero Kungliga Tekniska Hogskolan

Presenting Author Biography: Francesco Mario D'Afiero is currently a PhD student at Kungliga Tekniska Högskolan (KTH), where he is specializing in high order direct numerical simulations (DNS) of transonic low pressure turbines. His interests mainly concern the discontinuous Galerkin flux reconstruction (DG-FR) approach. He is currently developing novel numerical approaches to tackle scale resolving simulations of flows of industrial interest.

Authors:

Francesco Mario D'afiero Kungliga Tekniska Hogskolan
Mihai Mihaescu Kungliga Tekniska Högskolan
Ardeshir Hanifi Kungliga Tekniska Högskolan