Large-eddy simulation of transonic turbulent flow over a bump

Sandham, N. D., Yao, Y. and Lawal, A. A. (2003) Large-eddy simulation of transonic turbulent flow over a bump. International Journal of Heat and Fluid Flow, 24 (4). pp. 584-595. ISSN 0142-727X

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Publisher's URL: http://dx.doi.org/10.1016/S0142-727X(03)00052-3

Abstract

Transonicturbulent boundary-layer flowovera circular-arc bump has been computed by high-resolution large-eddysimulation of the compressible Navier–Stokes equations. The inflow turbulence was prescribed using a new technique, in which known dynamical features of the inner and outer part of the boundary-layer were exploited to produce a standard turbulent boundary-layer within a short distance of the inflow. This method was separately tested for a flat plate turbulent boundary-layer, for which results compared well with direct numerical simulation databases. Simulation of the bumpflow was carried out using high-order methods, with the dynamic Smagorinsky model used for sub-grid terms in the momentum and energy equations. Simulations were carried out at a Reynolds number of 233,000 based on bump length and free-stream properties upstream of the bump. At a back pressure equal to 0.65 times the stagnation pressure, a normal shock was formed near the bump trailing-edge and a peak mean Mach number of 1.16 was observed. Turbulence fluctuations decayed in the favourable pressure gradient region of the flow, before being amplified due to the shock interaction and boundary-layer separation. The effect of Reynolds number on turbulence intensity upstream of the shock is discussed in connection with a laminarisation parameter. With reference to turbulence modelling, anisotropy levels are not unreasonably high in the shock interaction region and shock unsteadiness was not found to be an issue. Of more relevance to the perceived poor performance of models for this type of flow may be the extremely rapid rise and decay of turbulence levels in the separated shear layer immediately under the shock-wave.

Item Type:Article
Additional Information:This work was supported by the Engineering and Physical Science Research Council [grant numbers GR/M 84336 and GR/R 64957].
Uncontrolled Keywords:direct numerical simulation, large-eddy simulation, compressible turbulence, shock/boundary-layer interaction
Faculty/Department:Faculty of Environment and Technology
ID Code:17720
Deposited By: A. Clarke
Deposited On:16 Oct 2012 12:43
Last Modified:07 Oct 2013 14:55

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