Computation of the helicopter fuselage wake with the SST, SAS, DES and XLES models

Le Chuiton, F., D’Alascio, A., Barakos, G. , Steijl, R. , Schwamborn, D. and Lüdeke, H. (2008) Computation of the helicopter fuselage wake with the SST, SAS, DES and XLES models. In: Peng, S.-H. and Haase, W. (eds.) Advances in Hybrid RANS-LES Modelling. Series: Notes on numerical fluid mechanics and multidisciplinary design (97). Springer, pp. 117-124. ISBN 9783540778134 (doi: 10.1007/978-3-540-77815-8_12)

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This paper presents a first industrial attempt at Eurocopter Germany to use DES-like methods to compute the wake behind a helicopter in forward flight. Three codes have been used: TAU (DLR), CFX (Ansys) and HMB (Uni. Liverpool) and four different turbulence models: standard SST and three of its unsteady extensions SAS, DES and XLES. Results for the loads, pressure distribution and skin-friction lines have been compared to each other and against wind tunnel experimental data. These more sophisticated models brought improvements over the base SST but not always markedly and consistently: the drag gets improved although the negative lift on the body departs further form the experimental value. The pressure distribution on the backdoor has been improved by one of the computation. Oil-flow visualisation results show that the mean flow in the region of the backdoor is qualitatively reasonably well captured.

Item Type:Book Sections
Glasgow Author(s) Enlighten ID:Barakos, Professor George and Steijl, Dr Rene
Authors: Le Chuiton, F., D’Alascio, A., Barakos, G., Steijl, R., Schwamborn, D., and Lüdeke, H.
College/School:College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity

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