Drag of a turbulent boundary layer with transverse 2D circular rods on the wall

Drag of a turbulent boundary layer with transverse 2D circular rods on the wall In this paper, we present the results of a turbulent boundary layer developing over a rod-roughened wall with a spacing of $$\lambda /k = 8$$ λ / k = 8 ( $$\lambda$$ λ is the spacing between two adjacent roughness elements, and $$k$$ k is the rod diameter). Static pressure measurements are taken around a single roughness element to accurately determine the friction velocity, $$U_\tau$$ U τ and the error in the origin, $$d_0$$ d 0 , which are the two prominent issues that surround rough-wall boundary layers. In addition, velocity measurements are taken at several streamwise locations using hot-wire anemometry to obtain $$C_\mathrm{f}$$ C f from the momentum integral equation. Results showed that both methods give consistent values for $$U_\tau$$ U τ , indicating that the contribution of the viscous drag over this rough wall is negligible. This supports the results of Perry et al. (J Fluid Mech 177:437–466, 1969) and Antonia and Luxton (J Fluid Mech 48(04):721–761, 1971) in a boundary layer and of Leonardi et al. (2003) in a channel flow but does not agree with those of Furuya et al. (J Fluids Eng 98(4):635–643, 1976). The results show that both $$U_{\tau }$$ U τ and $$d_0$$ d 0 can be unambiguously measured on this particular rough wall. This paves the way for a proper comparison between the boundary layer developing over this wall and the smooth-wall turbulent boundary layer. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Drag of a turbulent boundary layer with transverse 2D circular rods on the wall

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Springer Berlin Heidelberg
Copyright © 2015 by Springer-Verlag Berlin Heidelberg
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
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