Fluorescent Lichen Alimah Bhatti

Xanthoria parietina is a nitrogen loving, foliose lichen and under visible light, it is easily spotted by its characteristic yellow/orange to greenish yellow lobes that are commonly spotted in urban locations on wayside trees and rocks. However, under Ultraviolet light, the lobes fluoresce, exhibiting vivid colours of pink and red.

My study aimed to determine the diversity of lichen in London and how location and other key factors influencing microclimates within London impacts growth and species richness. I took this picture in the early stages of my research to identify the different species I encountered throughout the course of the project.

AirfoilTurbulenceGeneration using VortexGenerators Clinton Naicker

Wind tunnel experiments are limited by the inflow velocity and size of the test section. Therefore, to test the effectiveness of noise reduction mechanisms, lower speed experiments use "tripping" to force the transition of laminar flow to turbulent flow.

In order to make a like-for-like comparison with experiments carried out at the Brunel Aeroacoustics lab, CFD analysis was carried out at a Reynolds number of 200,000 on an airfoil section making use of a "zigzag" type trip.

The picture shows the turbulent structures for both the clean and tripped airfoil.