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Numerical study of transonic cavity flows using large-eddy and detached-eddy simulation

Part of: 75 year anniversary of Aeronautical Engineering at Glasgow University

Published online by Cambridge University Press:  03 February 2016

P. Nayyar ,
G. N. Barakos  and
K. J. Badcock
P. Nayyar
Affiliation:
CFD Laboratory, Department of Aerospace Engineering, University of Glasgow, Glasgow, UK
G. N. Barakos
Affiliation:
Department of Engineering, University of Liverpool, Liverpool, UK
K. J. Badcock
Affiliation:
Department of Engineering, University of Liverpool, Liverpool, UK
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Abstract

Numerical analysis of the flow in weapon bays modelled as open rectangular cavities of length-to-depth (L/D) ratio of 5 and width-to-depth (W/D) ratio of 1 with doors-on and doors-off is presented. Flow conditions correspond to Mach and Reynolds numbers (based on cavity length) of 0·85 and 6·783m respectively. Results from unsteady Reynolds-averaged Navier-Stokes (URANS), large-eddy simulation (LES) and detached-eddy simulation (DES) are compared with the simulation methods demonstrating the best prediction of this complex flow. It was found that URANS was not able to predict the change of flow characteristics between the doors-on and doors-off configurations. In addition, the energy content of the cavity flow modes was much better resolved with DES and LES. Further, the DES was found to be quite capable for this problem giving accurate results (within 3dB of) experiments and appears to be a promising alternative to LES for modelling massively separated flows.

Type
Research Article
Information
The Aeronautical Journal , Volume 111 , Issue 1117 , March 2007 , pp. 153 - 164
Copyright
Copyright © Royal Aeronautical Society 2007 

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