Details of Grant

A 4-year computational programme is proposed, combining simulation and modelling elements, which intends to illuminate the key physical and dynamic mechanisms contributing to vortical separation from highly swept wings and identify the predictive capabilities of LES vis a vis RANS modelling for such wings. One major challenge for LES is the need for high accuracy in the presence of high Reynolds numbers and complex geometry. The uncertainty on the most appropriate choice of numerical framework leads the proposal to devote an initial period of 1 year to an examination of three different numerical schemes; cell centred finite volume, hp spectral element and Godunov schemes. The most appropriuate scheme would then be used, within a version of a variant of the Detached Eddy Simulation methodology, to examine physical issues. RANS/URANS studies will also be undertaken, exploiting LES and experimental data. It is expected that the second-order cell-centred FV formulation would be used for this study. In terms of turbulence modelling, it is likely that eddy-viscosity models (linear/non-linear) will be employed. It is also likely that additional model elements (or corrections) will be adopted to accommodate the highly-swirling portion of the flow and flow unsteadiness, for which normally second-moment closure would normally be expected to give superior performance.

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