Velocity statistics for rough-wall turbulent boundary layer flow over LEGO roughness elements in different layouts

Abstract

This dataset presents 2D PIV experimental data collected over a range of twelve urban roughnesses with different frontal and plan solidities. These are described in: [1] Placidi, M., & Ganapathisubramani, B. (2015). Effects of frontal and plan solidities on aerodynamic parameters and the roughness sublayer in turbulent boundary layers. Journal of Fluid Mechanics, 782, 541–566. http://doi.org/10.1017/jfm.2015.552 [2] Placidi, M., & Ganapathisubramani, B. (2018). Turbulent Flow Over Large Roughness Elements: Effect of Frontal and Plan Solidity on Turbulence Statistics and Structure. Boundary-Layer Meteorology, 167, 99–121. http://doi.org/10.1007/s10546-017-0317-3 [3] 3] Placidi M. & Ganapathisubramani, B (2019). Velocity statistics for rough-wall turbulent boundary layer flow over LEGO roughness elements in different layouts. DOI: 10.5258/SOTON/D0829. PLEASE CITE THESE PAPERS AND THIS DATASET DOI WHEN USING THE DATA. Contact Dr Marco Placidi (m.placidi@surrey.ac.uk) or Prof Bharathram Ganapathisubramani (G.Bharath@soton.ac.uk) for any queries on the dataset. $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ Format of the dataset: d             =    Virtual origin [mm] delta       =    Boundary layer thickness (delta99 [mm]) deltas     =    Displacement thickness [mm] dyn_visc_air     =    Air dynamic viscosity [Kg/(m s)] h             =    Height of the roughness [mm] K = Acceleration parameter as in [1] rho_air         =    Air density [kq/m^3] run         =    Case ID as in [1] and [2] theta       =    Momentum thickness [mm] U             =    Mean streamwise velocity [m/s] U_edge         =    Mean streamwise velocity at the edge of the boundary layer [m/s] utau           =    Skin friction velocity [m/s] based on drag measurements uu             =    Streamwise velocity fluctuations uv             =    Reynolds shear stresses V             =    Mean wall-normal velocity [m/s] vv             =    Wall-normal velocity fluctuations X           =    Streamwise coordinate [mm] Y             =    Wall-normal coordinate [mm] y0           =    Roughness length [mm] Additional notes on the dataset: - The 2D PIV dataset has been averaged across the Field of View in the streamwise direction to obtain 1D profiles. - utau is measured directly by means of a floating-element drag balance as described in [1]. - y0,d, are obtained via best fitting the velocity profiles as in [1]. - The entire dataset has been filtered to match the local resolution for all cases, as discussed in [1]. - The acceleration parameter is defined in [1], and it is calculated from 2D PIV data across the size of the drag balance sensing element (i.e. 200 mm x200 mm). As such, it is affected by a significant experimental uncertainty. Additional verification of ZPG conditions were obtained via Pitot tube measurements between the inlet and outlet of the tunnel test section. The pressure gradient was considered negligible.

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