0
research-article

MULTIPHASE CFD MODELING OF EXTERNAL OIL FLOW FROM A JOURNAL BEARING

[+] Author and Article Information
Martin Berthold

Gas Turbine and Transmissions Research Centre (G2TRC), University of Nottingham, Nottingham, UK, The University of Nottingham, Nottingham, NG7 2TU, Energy Technology Building
martin.berthold@nottingham.ac.uk

Herve P. Morvan

Gas Turbine and Transmissions Research Centre (G2TRC), University of Nottingham, Nottingham, UK, The University of Nottingham, Nottingham, NG7 2TU, Energy Technology Building
herve.morvan@nottingham.ac.uk

Richard J Jefferson-Loveday

Gas Turbine and Transmissions Research Centre (G2TRC), University of Nottingham, Nottingham, UK, The University of Nottingham, Nottingham, NG7 2RD, Coates Building
richard.jefferson-loveday@nottingham.ac.uk

Colin Young

Rolls-Royce plc, Rolls-Royce plc, PO Box 31, Derby, DE24 8BJ
colin.young@rolls-royce.com

Benjamin C Rothwell

Gas Turbine and Transmissions Research Centre (G2TRC), University of Nottingham, Nottingham, UK, The University of Nottingham, Nottingham, NG7 2TU, Energy Technology Building
benjamin.rothwell@nottingham.ac.uk

Stephen Ambrose

Gas Turbine and Transmissions Research Centre (G2TRC), University of Nottingham, Nottingham, UK, The University of Nottingham, Nottingham, NG7 2TU, Energy Technology Building
stephen.ambrose3@nottingham.ac.uk

1Corresponding author.

ASME doi:10.1115/1.4041517 History: Received August 09, 2018; Revised August 28, 2018

Abstract

High loads and bearing life requirements make journal bearings a potential choice for use in high power, epicyclic gearboxes in jet engines. Computational Fluid Dynamics (CFD) simulations using the Volume of Fluid (VoF) method are carried out in ANSYS Fluent to model the two-phase flow behavior of the oil exiting the bearing and merging into the air surrounding the bearing. This paper presents an investigation of two numerical schemes that are available in ANSYS Fluent to track or capture the air-oil phase interface. Both numerical schemes are used to model the oil outflow behavior of a simplified, concentric journal bearing model. A comparison of both schemes is presented with regards to the accuracy of the phase interface reconstruction and the time required to reach steady state flow field conditions. The CFD predictions are validated against existing literature data with respect to the flow regime, the direction of the predicted oil flow path and the oil film thickness. Based on the findings and considerations of industrial requirements, a recommendation is made for the most suitable scheme to be used. In a representative, eccentric journal bearing the outflow behavior can be expected to be very different. The inlet boundary conditions for the oil emerging into the external journal bearing environment must be consistent with the outlet conditions from the bearing. The second part of this paper therefore focuses on providing a method to generate appropriate inlet boundary conditions for external oil flow from an eccentric journal bearing.

Rolls-Royce plc
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In