Abstract
The massively separated wake behind a wall-mounted square cylinder is investigated by means of direct numerical simulation (DNS). The effect of inflow conditions is assessed by considering two different cases with matching momentum-thickness Reynolds numbers \(Re_{\theta } \simeq 1000\) at the location of the cylinder: one with a fully-turbulent boundary layer as inflow condition, and another one with a laminar boundary layer. The main simulation is performed by using the spectral element code Nek5000. While in the laminar-inflow simulation the horseshoe vortex forming around the cylinder can be observed in the instantaneous flow fields, this is not the case in the turbulent-inflow simulation. Besides, the streaks in the turbulent case become greatly attenuated on both sides of the obstacle. By analyzing the Reynolds shear stress \(\overline{uv}\), we show that this is due to the modulation of the horseshoe vortex by the turbulence from the incoming boundary layer.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
J.A. Bourgeois, P. Sattari, R.J. Martinuzzi, Coherent vortical and straining structures in the finite wall-mounted square cylinder wake. Int. J. Heat Fluid Flow 35, 130–140 (2012)
M. Chevalier, P. Schlatter, A. Lundbladh, D.S. Henningson, A pseudospectral solver for incompressible boundary layer flows Technical report. TRITA-MEK. Stockholm: KTH (2007)
P.F. Fischer, J.W. Lottes, S.G. Kerkemeier, Nek5000: open source spectral element CFD solver (2008), http://nek5000.mcs.anl.gov
Y. Maday, A.T. Patera, Spectral element methods for the navier-stokes equations, in State of the Art Surveys in Computational Mechanics, ed. by A.K. Noor (ASME, New York, 1989), pp. 71–143
H.M. Nagib, T.C. Corke, Wind microclimate around buildings: characteristics and control. J. Wind Eng. Ind. Aerodyn. 16, 1–15 (1984)
A.T. Patera, A spectral element method for fluid dynamics: laminar flow in a channel expansion. J. Comput. Phys. 54, 468–488 (1984)
P. Schlatter, R. Örlü, Turbulent boundary layers at moderate reynolds numbers: inflow length and tripping effects. J. Fluid Mech. 710, 5–34 (2012)
R. Vinuesa, S.M. Hosseini, A. Hanifi, D.S. Henningson, P. Schlatter, Direct numerical simulation of the flow around a wing section using high-order parallel spectral methods, in International Symposium Turbulence & Shear Flow Phenomena (TSFP-9), 30 June–3 July, (Melbourne, Australia, 2015)
R. Vinuesa, A. Noorani, A. Lozano-Durán, G.K. El Khoury, P. Schlatter, P.F. Fischer, H.M. Nagib, Aspect ratio effects in turbulent duct flows studied through direct numerical simulation. J. Turbul. 15, 677–706 (2014)
R. Vinuesa, P. Schlatter, J. Malm, C. Mavriplis, D.S. Henningson, Direct numerical simulation of the flow around a wall-mounted square cylinder under various inflow conditions. J. Turbul. 16, 555–587 (2015)
R. Vinuesa, P. Schlatter, H.M. Nagib, On minimum aspect ratio for duct flow facilities and the role of side walls in generating secondary flows. J. Turbul. 16, 588–606 (2015)
H.F. Wang, Y. Zhou, C.K. Chan, K.S. Lam, Effect of initial conditions on interaction between a boundary layer and a wall-mounted finite-length-cylinder wake. Phys. Fluids 18, 065106 (2006)
Acknowledgments
The first author acknowledges financial support from the Knut and Alice Wallenberg Foundation. Computer time provided by the Swedish National Infrastructure for Computing (SNIC) is also gratefully acknowledged.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2016 Springer International Publishing Switzerland
About this paper
Cite this paper
Vinuesa, R., Schlatter, P., Henningson, D.S. (2016). Characterization of the Massively Separated Wake Behind a Square Cylinder by Means of Direct Numerical Simulation. In: Segalini, A. (eds) Proceedings of the 5th International Conference on Jets, Wakes and Separated Flows (ICJWSF2015). Springer Proceedings in Physics, vol 185. Springer, Cham. https://doi.org/10.1007/978-3-319-30602-5_32
Download citation
DOI: https://doi.org/10.1007/978-3-319-30602-5_32
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-319-30600-1
Online ISBN: 978-3-319-30602-5
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)