Abstract
LES results are presented for the flow over different bump profiles installed on the bottom wall of a channel. Three bump geometries are considered in order to investigate the effects of adverse pressure gradients and changes in curvature on the mean flow and Reynolds stresses. The first bump geometry corresponds to a profile for which DNS results are available at a Reynolds number \(Re_{\tau } =\) 617 based on the channel inlet friction velocity. The other two geometries are generated by modifying the rear portion of the initial profile to produce a longer APG region and promote smoother curvature changes as compared to the original profile. LES computations are performed at the same Reynolds numbers than previous DNS, which is also used to validate LES results in the original bump. Finally, RANS results are also presented for the three bump profiles. RANS computations are performed using a two-equation eddy-viscosity Shear Stress Transport (SST) model and one Reynolds stresses transport model.
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ANSYS, Inc., ANSYS FLUENT Theory Guide Release 14.0 (2011)
A.B. Jesus, J.L.F. Azevedo, J.P. Laval, Large eddy simulations and RANS computations of adverse pressure gradient flows, in AIAA Paper No. AIAA 2013-0267, 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, Grapevine, TX (2013)
A.B. Jesus, L.A.C.A. Schiavo, J.L.F. Azevedo, J.P. Laval, An assessment of attached and mildly separated flows in adverse pressure gradient regions, in AIAA Paper No. AIAA 2014-0583, 52nd AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, National Harbor, Maryland (2014)
L. Kuban, J.P. Laval, W. Elsner, A. Tyliszcak, M. Marquillie, Les modeling of converging-diverging turbulent channel flow. J. Turbul. 16(11), 1–19 (2012)
B.E. Launder, N. Shima, Second-moment closure for the near-wall sublayer: development and application. AIAA J. 27(10), 1319–1325 (1989)
J.P. Laval, M. Marquillie, U. Ehrenstein, On the relation between kinetic energy production in adverse-pressure gradient wall turbulence and streak instability. J. Turbul. 13, 1–19 (2012)
M. Marquillie, J.P. Laval, R. Dolganov, Direct numerical simulation of separated channel flows with a smooth profile. J. Turbul. 9(1), 1–23 (2008)
M. Marquillie, U. Ehrenstein, J.P. Laval, Instability of streaks in wall turbulence with adverse pressure gradient. J. Fluid Mech. 681, 205–240 (2011)
F.R. Menter, M. Kuntz, R. Langtry, Ten years of industrial experience with the SST turbulence model, Turbulence, Heat and Mass Transfer, vol. 4 (Begell House, Inc., Redding, 2003)
T.H. Shih, W.W. Liou, A. Shabbir, Z. Yang, J. Zhu, A new \(k-\varepsilon \) eddy-viscosity model for high Reynolds number turbulent flows—model development and validation. Comput. Fluids 24(3), 227–238 (1995)
Acknowledgments
The authors gratefully acknowledge the partial support for this research provided by Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq, under the Research Grant No. 309985/2013-7. This work is also supported by Fundação de Amparo à Pesquisa do Estado de São Paulo, FAPESP, through a M.S. scholarship for the second author under the Research Grant No. 2013/12015-2. J-P Laval gratefully acknowledge the support of International Campus on Safety and Intermodality in Transportation, the European Community, the Regional Delegation for Research and Technology, the Ministry of Higher Education and Research, and the National Center for Scientific Research. The computational resources provided by Centro Nacional de Supercomputação, CESUP, of Universidade Federal do Rio Grande do Sul, in Porto Alegre is also gratefully acknowledged.
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de Jesus, A.B., Schiavo, L.A.C.A., Azevedo, J.L., Laval, JP. (2016). Adverse Pressure Gradients and Curvature Effects in Turbulent Channel Flows. In: Stanislas, M., Jimenez, J., Marusic, I. (eds) Progress in Wall Turbulence 2. ERCOFTAC Series, vol 23. Springer, Cham. https://doi.org/10.1007/978-3-319-20388-1_26
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DOI: https://doi.org/10.1007/978-3-319-20388-1_26
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