The flow around a surface mounted cube: a characterization by time-resolved PIV, 3D Shake-The-Box and LBM simulation
- PDF / 10,946,794 Bytes
- 22 Pages / 595.276 x 790.866 pts Page_size
- 7 Downloads / 177 Views
RESEARCH ARTICLE
The flow around a surface mounted cube: a characterization by time‑resolved PIV, 3D Shake‑The‑Box and LBM simulation A. Schröder1 · C. Willert2 · D. Schanz1 · R. Geisler1 · T. Jahn1 · Q. Gallas3 · B. Leclaire4 Received: 19 March 2020 / Revised: 22 June 2020 / Accepted: 13 July 2020 © The Author(s) 2020
Abstract The flow around a surface mounted cube with incoming turbulent or laminar boundary layer has been topic of many experimental and numerical investigations in the past decades. Despite its simple geometry the flow generates a set of complex vortical structures in front and around the cube, includes flow separation at the three front plane edges with corresponding subsequent shear layer dynamics enveloping recirculation zones. Downstream of the cube a large unsteady flow separation region is present which is associated with typical quasi-periodic bluff-body wake dynamics. Therefore the flow configuration is well suited to enhance the understanding of similar unsteady and separated flow phenomena in many aerodynamic and engineering applications. In the present experimental investigation we aim at resolving a large spectrum of spatial and temporal scales in the flow around a cube with incoming laminar and turbulent boundary layers by using the most recent developments of dense 3D Lagrangian particle tracking (LPT) and high resolution TR-PIV for Reynolds numbers based on cube size in the range ReH = U∞ H 𝜈 −1 = 2000 − 8000 . The results documented in the present paper consist of snapshots and the analysis of long time-series of highly resolved 3D and 2D velocity fields suited to enhance the understanding of coherent structure dynamics and of corresponding statistical Lagrangian and Eulerian flow properties. Premultiplied velocity spectra and 3D pressure distributions are calculated and discussed as well. Finally, the measurement data is compared to results obtained with a simulation based on the lattice Boltzmann method (LBM).
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00348-020-03014-5) contains supplementary material, which is available to authorized users. * A. Schröder [email protected] * C. Willert [email protected] 1
Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institute of Aerodynamics and Flow Technology, 37075 Göttingen, Germany
2
Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institute of Propulsion Technology, 51170 Köln, Germany
3
Univ. Lille, CNRS, ONERA, Arts et Metiers Institute of Technology, Centrale Lille, UMR 9014, LMFL, Laboratoire de Mécanique des fluides de Lille, Kampé de Fériet, 59000 Lille, France
4
DAAA, ONERA, University Paris Saclay, 92190 Meudon, France
13
Vol.:(0123456789)
189
Page 2 of 22
Experiments in Fluids
(2020) 61:189
Graphic abstract
1 Introduction In the last few decades, there has been extensive research on turbulent boundary layer (TBL) and turbulent channel flows around wall-attached obstacles, including cubes with various aspect ratios roughly in th
Data Loading...
