Summary
In the present paper, a detailed numerical investigation of the flow field in the vicinity of an isolated 3D surface roughness is presented. The Direct Numerical Simulations (DNS) shown are based on the velocity-vorticity formulation of the complete Navier—Stokes equations for incompressible fluids. The small surface roughness is modeled within the cartesian grid using an immersed boundary technique.
In the wake of the surface irregularity, a pair of counter-rotating streamwise vortices is visible at each side of the roughness. The pair of vortices results in a high-speed streak downstream of the spanwise edge of the roughness, which is flanked by two low-speed streaks. The whole vortex system looks very similar to horseshoe vortex systems that were observed in experiments around surface mounted cylinders or cubes.
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© 2004 Springer-Verlag Berlin Heidelberg
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Wörner, A., Rist, U., Wagner, S. (2004). Numerical Investigation of the Flow in the Vicinity of an Isolated 3D Surface Roughness. In: Breitsamter, C., Laschka, B., Heinemann, HJ., Hilbig, R. (eds) New Results in Numerical and Experimental Fluid Mechanics IV. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 87. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-39604-8_40
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DOI: https://doi.org/10.1007/978-3-540-39604-8_40
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-53546-8
Online ISBN: 978-3-540-39604-8
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