Large-scale measurements in turbulent pipe flow using 3D Lagrangian Particle Tracking

Kurzfassung

A direct comparison of high Reynolds number turbulent pipe and ZPG-TBL flows according to their mean and Reynolds stress profiles, to their scaling properties, spectral contents and the entangled role of coherent structures (superstructures) in the near wall, logarithmic and core/wake region is of eminent interest. Following this thought, we present a large-scale Lagrangian Particle Tracking (LPT) investigation of pipe flow, complementing an existing dataset on TBL flow. The measurements were conducted in the Cottbus Large-Pipe facility (CoLa-Pipe). The aim was to measure the flow within the full cross-section along a glass-pipe section, of ~1 m length (≈10 R), allowing to fully visualize the VLSM structures and their spatio-temporal development.