Comparative Studies of RANS versus LES for Fan-intake Interaction

[+] Author and Article Information
Yunfei Ma

PhD candidate, Department of Engineering, University of Cambridge, United Kingdom, CB2 1PZ

Nagabhushana Rao Vadlamani

Assistant Professor, Department of Aerospace Engineering, Indian Institute of Technology (IIT) Madras, Chennai 600036, India

Jiahuan Cui

Assistant Professor, School of Aeronautics and Astronautics, ZJU-UIUC Institute, Zhejiang University, People's Republic of China, 310007

Paul G. Tucker

Professor, Department of Engineering, University of Cambridge, United Kingdom, CB2 1PZ

1Corresponding author.

ASME doi:10.1115/1.4041393 History: Received April 23, 2018; Revised September 03, 2018


The present research applied a mixed-fidelity approach to examine the fan-intake interaction. Flow separation induced by a distortion generator (DG) is either resolved using large eddy simulation (LES) or modeled using the standard k–w model, SA model, etc. The Immersed Boundary Method with Smeared Geometry (IBMSG) is employed to represent the effect of the fan and a wide range of test cases is studied by varying the (a) height of the DG and (b) proximity of the fan to the DG. Comparisons are drawn between the LES and the RANS approaches with/without the fan effect. It is found that in the "absence of fan", the discrepancies between RANS and LES is significant within the separation and reattachment region due to the well-known limitations of the standard RANS models. "With the fan installed", the deviation between RANS and LES decreases substantially. It becomes minimal when the fan is closest to the distortion generator. It implies that with an installed fan, the inaccuracies of the turbulence model are mitigated by the strong flow acceleration at the casing due to the fan. More precisely, the mass flow redistribution due to the fan has a dominant primary effect on the final predictions and the effect of turbulence model becomes secondary, thereby suggesting that high fidelity eddy resolving simulations provide marginal improvements to the accuracy for the installed cases, particularly for the short intake-fan strategies with fan getting closer to intake lip.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.





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