PIV ANALYSIS OF FLOW STRUCTURES AROUND SKEWED SPUR DIKES

PIV measurements of flow in and around scour holes

Two sets of experiments related to the scour of cohesionless sediment by planar turbulent jets are presented and discussed. The first set of experiments measures the growth of the scour hole and downstream dune as a function of time. Measurements reveal a bedform that is nearly self-similar and whose growth in time is governed by a power-law relationship. The bedform is well represented by thre...

Temporal analysis of coherent structures in a turbulent BFS flow with PIV

The phenomenon of flow separation and reattachment over a backward facing step geometry is investigated in the turbulent regime (Reh = 5000) by means of particle image velocimetry (PIV). The arrangement of the water flow facility with controlled fluid temperature allows achieving a field sampling frequency twice the convective reference frequency, which is satisfactory for the large-scale fluct...

اثر شرایط جریان و عوامل هندسی آبشکن مستغرق در پایداری ریپ‌رپ

Spur dikes are the most common hydraulic structures for river bank protection. Since the construction of this structure causes higher velocities around it, this structure is exposed to erosion. Riprap around the structure nose is one of the most common and economic way to protect spur dike. The main aim of this study is to investigate the riprap stability in a mild 90 degrees bend. Experiments ...

Visualization of three-dimensional vortex structures around a dragonfly with dynamic PIV

Piv Analysis of Turbulent Flow in a Micro-channel

Turbulent flow of water in a short 0.4mm high micro-channel of an emulsifier is investigated experimentally using a micro-PIV technique and compared with numerical predictions. The micro-flow measurements are based on epi-fluorescence illumination and high-speed imaging. Velocity fields obtained from the measurements and direct numerical simulations indicate that flow turbulization is delayed a...