Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Perturbation of a Turbulent Channel Flow by a two-dimensional Triangular Ripple
Submission Author:
Fernando David Cúñez , SP
Co-Authors:
Fernando David Cúñez, Erick de Moraes Franklin
Presenter: Fernando David Cúñez
doi://10.26678/ABCM.COBEM2017.COB17-1770
Abstract
Turbulent flows perturbed by low hills are commonly found in industrial and environmental applications. The perturbation introduces new scales in the problem changing the main flow properties along the hills. This study presents an experimental study on a perturbation of fully-developed turbulent channel flow by a triangular ripple. Two water flows that correspond to Reynolds numbers of 27,500 and 35,000 were imposed over an asymmetric triangular hill fixed on the bottom wall of a rectangular closed conduit, and the flow fields were measured by PIV (Particle Image Velocimetry). From the instantaneous flow fields, the mean velocities and fluctuations were computed, and the shear stress over the ripple and the field of turbulent production were determined. The general behaviors of obtained velocities and stresses are compared to published asymptotic analyses and the shear stress is discussed in terms of bed stability.
Keywords
turbulent flows, Turbulent Boundary Layer, Perturbation, PIV.
