2 Minute read
The key research questions in this project are:
- To investigate how boundary layers with specific perturbations evolve in the downstream direction and respond to streamwise pressure gradients.
- To focus on the detailed physics of the embedded vortex flow evolution.
- To gain insights on how to efficiently model such effects in the RANS or hybrid RANS simulations that are useful to industry.
While the past decades have seen substantial advancements in our capacity to numerically model wall-bounded turbulent flows, wall-flows encountering additional perturbations remain a significant challenge. Such flows include the effects of heterogeneous roughness, pressure gradients and additional strain rates, or a combination of these factors. For many aerodynamic and hydrodynamic applications, a prevalent circumstance is the presence of organised streamwise vortices that evolve as a secondary flow embedded within a boundary layer.
The experiments focus on high-resolution PIV of the streamwise vortex system that forms in a laminar boundary layer junction flow. These experiments will be conducted in a small water channel at Melbourne. To complement these experiments, high resolution direct numerical simulations (DNS) will be conducted at Aachen. Accordingly, the PhD student’s efforts will focus on the analysis of the DNS in Germany and conducting and analysing the experiments in Australia.
Graduate researcher profile: Weiqi Sun
I achieved my masters degree at Zhejiang University, majoring in fluid mechanics. I love observing, recording and exploring interesting flow phenomena in nature (e.g. the flight of dandelion). My research in my graduate stage focuses numerical simulation of evaporating and atomising behavior of precursor droplets in plasma gas, especially addressing the relation between evaporation and atomisation of droplets in the thermal flow field of plasma gas.
My research interest in the following PhD stage focuses on elucidating the role of the various complicated vortices in nature and industry, and uncovering the underlying physical mechanism behind them (e.g. the leading-edge vortex and the separated vortex ring utilized by wind-dispersed seeds).
I see this joint project as a continual opportunity of my long-term research goal on more directly exploring significant flow phenomenon in nature and industrial applications (often involved with complicated vortex flow) with accurately numerical too, such as DNS (Direct Numerical Simulation) and reliable experimental observation.
- The University of Melbourne: Professor Joe Klewicki and Dr Jimmy Philip
- RWTH Aachen: Professor Wolfgang Schroeder, Dr Matthias Meinke and Dr Michael Klaas
First published on 2 September 2022.
Share this article
Other joint PhD projects
Plasticity-induced magnetisation losses in electric steel
This project aims to identify the mechanisms of energy conversion losses to develop a mechanism-based materials design approach to eventually increase the conversion efficiency of electric steel.
Unconventional superconductivity using renormalisation group methods
This project aims to apply cutting-edge theoretical methods to identify candidate materials that could be unconventional superconductors.
Towards a sustainable circular economy – integrating circularity in life cycle sustainability assessment
This project aims to define a consistent approach to integrating circular economy strategies into life cycle sustainability assessments.
Novel flowable lithium-ion battery
This project endeavours to integrate a lithium-based slurry electrode with common lithium salt solutions in a semi-solid redox flow battery.