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Sensitivity of Numerical Simulations of Low-Reynolds Number Flow Over the T106 Turbine Blade

[+] Author Affiliations
X. de Saint Victor

ONERA, Toulouse, France

Paper No. GT2010-22903, pp. 883-890; 8 pages
doi:10.1115/GT2010-22903
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4399-4 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

Numerical simulations with a Navier-Stokes solver have been performed in case of weak chord Reynolds numbers varying from 80000 to 160000 over the T106 turbine blade. Results are compared to experiments in the literature. The sensitivity of these computations to different parameters has been examined. Six different transition criteria are tested and results exhibit significant differences as they do not predict the transition starting at the same location. Some of them predicting a too early transition do not allow the separation bubble existence. The sensitivity of the separation bubble to the transition start is studied imposing the location of the transition point. So, a change of 1% chord in the transition location leads to drastically different physical behaviours. Different turbulence models have been tested. It is shown that the bubble appearance is submitted to the turbulent production level of the used model. The sensitivity to the grid refinement has been tested doubling the initial number of grid points in each spatial direction. This study is followed by an error estimate using a Richardson extrapolation technique. From its results, the initial mesh is adapted and a real improvement is noted.

Copyright © 2010 by ASME

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