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Effect of Turbulence Damping in VOF Simulation of an Aero-Engine Bearing Chamber

[+] Author Affiliations
Andrea Bristot, Hervé P. Morvan, Kathy Simmons

University of Nottingham, Nottingham, UK

Michael Klingsporn

Rolls-Royce Deutschland Ltd & Co KG, Blankenfelde-Mahlow, Germany

Paper No. GT2017-63436, pp. V02BT41A013; 10 pages
doi:10.1115/GT2017-63436
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 2B: Turbomachinery
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5079-4
  • Copyright © 2017 by ASME

abstract

In aero-engine bearing chambers, the modelling of shear-driven oil films with the Volume of Fluid method poses significant challenges linked with the need to accurately capture the gas-liquid interaction at the free surface. Typically, the modelling of the latter relies on a dedicated scalable source term, which is activated locally at the interface between the phases. Our latest published work focused on the application of a popular term of this kind known as turbulence damping, and raised some questions on the suitability of the choice of a high value for its scaling factor. In this paper, a lower turbulence damping factor value is proposed. The new results are evaluated against both the reference bearing chamber experimental data and the previously published numerical data. The results highlight that a transition from shear-driven to gravity-driven flow conditions takes place once the damping factor value is decreased. Considering the impact this may have on the accuracy of the numerical predictions, a strategy is proposed towards a better-informed choice of the turbulence damping factor, in particular when the expected flow conditions are unknown.

Copyright © 2017 by ASME

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