Investigating the 3D Flow Structure Downstream of a Fence

Investigating the 3D Flow Structure Downstream of a Fence

Akhavan Taheri Borojeni, A.

Westerweel, J. (mentor)
Elsinga, G.E. (mentor)

Mechanical, Maritime and Materials Engineering

Laboratory for Aero and Hydrodynamics

Mechanical Engineering (Solid and Fluid Mechanics)

2010-08-24

In this research the experiments were performed in the water tunnel at the Laboratory for Aero and Hydrodynamics to investigate the 3D flow structure over roughness elements as a model for the flow over urban environment. It represents the first phase in an extended study on the dispersion of pollutants in an urban environment, which process is governed by the mentioned flow structure. This is an urgent problem as the air quality in cities is decreasing due to increasing pollution from cars and industrial activity. If we can improve the understanding of the dispersion of these gases, we can possibly improve this situation or at least better predict these problems. The principal experimental technique that will be employed is Tomographic-PIV , which is a state-of-the-art experimental technique to measure the flow velocity in a 3D volume. So far it has been applied mainly to investigate the flow structures in some classic turbulence cases: a cylinder wake and turbulent boundary layer over a flat plate. Its applicability to more complex geometries, like the rough wall considered here, is unexplored yet and needed to be assessed as a part of this project.

turbulent boundary layer
particle image velocimetry
tomographic PIV
flow over fence
inclination angle
urban-like fence obstacle

http://resolver.tudelft.nl/uuid:0ed6241d-0958-435c-a32e-e906d1b141cb

Student theses

master thesis

(c) 2010 Akhavan Taheri Borojeni, A.