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The Effect of Turbulent Scales on Low-Pressure Turbine Aerodynamics: Part A — An Optimized Turbulent Boundary-Condition

[+] Author Affiliations
Christoph Müller-Schindewolffs, Florian Herbst

Leibniz Universität Hannover, Hannover, Germany

Paper No. GT2018-75162, pp. V02BT41A004; 16 pages
  • ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
  • Volume 2B: Turbomachinery
  • Oslo, Norway, June 11–15, 2018
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5100-5
  • Copyright © 2018 by ASME


Exact inflow conditions for DNS and LES can be generated by resource-intensive precursor simulations of three-dimensional periodic boxes or infinite channels, in the case where a wall-bounded flow is investigated. A cheaper and much more flexible alternative is the use of synthetic boundary conditions. In the proposed paper, a modified synthetic-eddy-method will be presented, which suits the demands and specifications of turbo-machinery applications. It will further be extended to subsonic compressible flows by adding a mechanism to uncouple acoustic waves. It is applied to synthetically reproduce the wake of a turbine test case and validated against the original cascade simulation which is presented in the according Part B paper. This highly flexible approach also provides interfaces to prescribe unsteady inflow conditions, by temporally changing velocities, Reynolds stresses, and turbulent length-scales.

Copyright © 2018 by ASME



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