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Assessment of Grid Resolution Requirements for Accurate Simulation of Disparate Scales of Turbulent Flow in Low-Pressure Turbines

[+] Author Affiliations
R. Pichler, R. D. Sandberg

University of Melbourne, Melbourne, Australia

V. Michelassi

General Electric, Florence, Italy

Paper No. GT2016-56858, pp. V02CT39A030; 12 pages
doi:10.1115/GT2016-56858
From:
  • ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
  • Volume 2C: Turbomachinery
  • Seoul, South Korea, June 13–17, 2016
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4971-2
  • Copyright © 2016 by ASME

abstract

Direct numerical simulations (DNS) on different grids for two Reynolds numbers of the T106A turbine cascade have been conducted to understand the influence of resolution on the solution. The work was motivated by different resolutions used in previously published studies that could not only be explained by different numerical methods. Most of these published studies used mean blade pressure distribution and wake loss profiles for validation and grid convergence purposes. DNS for canonical cases in general use more stringent criteria based on turbulence statistics considering that those require higher resolution.

Therefore, in this study the influence of grid resolution on disparate scales of DNS is discussed. It is discussed that mean blade pressure distribution and mean wake loss already show good agreement with experiments for large eddy simulations (LES) provided a sufficient part of the turbulence kinetic energy is resolved. However, to avoid modelling uncertainties of turbulence quantities, DNS is required as LES only resolves part of the turbulence kinetic energy. It is found that in order to achieve grid convergence for turbulence dissipation a six times larger resolution and more than 10 times the computational cost is required than if grid convergence was required for turbulence kinetic energy.

Copyright © 2016 by ASME

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