

Article
Simulations of spatially evolving turbulent boundary layers up to Re_\theta = 4300
AbstractA wellresolved largeeddy simulation (LES) of a spatially developing turbulent boundary layer under zeropressuregradient up to comparably high Reynolds numbers Re_\theta=4300 is performed. The laminar inflow is located at Re_{\delta^*}=450 or Re_t\heta=180, a position where natural transition to turbulence can be expected. The simulation is validated and compared extensively to both numerical data sets, i.e. a recent spatial direct numerical simulation (DNS) up to Re_\theta=2500 (Schlatter et al., 2009) and available experimental measurements, e.g. the ones obtained by Österlund (1999). The goal is to provide the research community with reliable numerical data for high Reynoldsnumber wallbounded turbulence, which can in turn be employed for further model development and validation, but also to contribute to the characterisation and understanding of various aspects of wall turbulence. The results obtained via LES show that good agreement with DNS data at lower Reynolds numbers and experimental data can be obtained for both mean and fluctuating quantities. In addition, turbulence spectra characterising largescale organisation in the flow have been computed and compared to literature results with good agreement. In particular, the nearwall streaks scaling in inner units and the outer layer largescale structures can clearly be identified in both spanwise and temporal spectra.
LES Data

