Implicit CFD methods for transitional shock wave: boundary layer interaction

Zografakis, G. and Barakos, G. (2016) Implicit CFD methods for transitional shock wave: boundary layer interaction. Aircraft Engineering and Aerospace Technology, 88(5), pp. 636-648. (doi:10.1108/AEAT-05-2015-0123)

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Abstract

In this paper, the potential of transition prediction methods is explored for modelling transitional shock-wave/boundarylayer interactions. The study is fuelled by the strong interest of researchers and airframe manufacturers in reducing drag of vehicles flying at transonic speeds. The principle of drag reduction via flow laminarity is valid, provided there is no need for the flow to sustain large pressure gradients or shocks. This is true since laminar boundary layers are less resistant to flow separation. It is therefore worthwhile to assess the performance of CFD methods in modelling laminar boundary layers that can be tripped to turbulent just before the interaction with a shock. At this work, the CFD solver of Liverpool University is used. The method is strongly implicit and for this reason the implementation of 4-equation, intermittencybased models requires special attention. The Navier-Stokes equations, the transport equations of the kinetic energy of turbulence () and the turbulent frequency (ω) are inverted at the same time as the transport equations for the flow intermittency (γ) and the momentum thickness Reynolds number (Reθtr). The result is stable and robust convergence even for complex 3D flow cases. The method is demonstrated for the flow around the V2C section of the TFAST EU, F7 project. The results suggest that the intermittency based model captures the fundamental physics of the interaction but verification and validation is needed to ensure that accurate results can be obtained. For this reason, comparisons with the TFAST experiments is put forward as a means of establishing confidence in the transition prediction tools employed for shock/boundary-layer interaction simulation.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Barakos, Professor George
Authors: Zografakis, G., and Barakos, G.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Aircraft Engineering and Aerospace Technology
Publisher:Emerald
ISSN:0002-2667
ISSN (Online):1748-8842
Copyright Holders:Copyright © 2016 Emerald
First Published:First published in Aircraft Engineering and Aerospace Technology 88(5): 636-648
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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