Large Field of View Investigations of Turbulent Boundary Layers
The study of turbulent boundary layers is crucial not only because of their status as some of the most fundamental of fluid flows but also because of their presence across a broad range of engineering applications. A number of advanced PIV techniques are being applied to conduct high-quality measurements of the turbulent boundary layer, with a particular focus on the nature of the turbulent-non turbulent interface (TNTI), at the edge of the boundary layer. Stereoscopic PIV (SPIV) yields all three components of flow velocity, in contrast to traditional 2D-2C planar PIV, and is thus well-suited to providing high-resolution measurements of the turbulence in the flow. To enable imaging of large fields of view (FOVs) without compromising resolution, up to 3 SPIV systems consisting of 6 sCMOS cameras have been used with LEGO-based calibration targets to image a cross- stream plane of over mm. To investigate the details of the TNTI and isolate areas of interest in the flow, a novel application of fluorescent seeding particles is being investigated in collaboration with the Von Kármán Institute, where the particles were first developed. Future experiments will combine both experimental techniques in order to provide new insights into the nature of the TNTI at high Reynolds numbers.
Partner:
- Von Kármán Institute
Person in charge:
- Agastya Parikh, M.Sc.
Publications:
- Parikh A, Fuchs T, Bross M, et al. (2023) LEGO calibration targets for large-FOV particle image velocimetry. Exp Fluids 64:34