High Reynolds number pipe flow in the CiCLOPE Large Pipe investigated by 3D STB

Kurzfassung

Volumetric Lagrangian Particle Tracking was carried out in the CICLoPE long pipe facility at Reynolds numbers up to Reτ = 45,800. The large pipe of University of Bologna is located at Predappio, Italy and features a main tube, 0.9 m in diameter and 111.5 m in length (see Figure 1, left) (Talamelli et al. 2009). The huge dimensions result in high Reynolds number pipe flows, while retaining sufficiently large viscous length scales to allow the application of micro-sensor based and optical metrology. The aim of this experimental undertaking is the determination of highly resolved wall-normal profiles of velocities, Reynolds stresses and accelerations of all three components using Lagrangian particle tracking (LPT, Schröder and Schanz 2023) in a range of high Reynolds number regimes. These are beyond the capabilities of DNS and relevant for quantifying the growing trends of first and second peak of streamwise velocity fluctuations and its pre-multiplied spectra.