Dr Alex Stubbs

Job: Postdoctoral Research Assistant

Employer: University College London

PhD Thesis: The Physical and Numerical Representation of Turbulent Flow over a Porous Riverbed

PhD Supervisors: Dr Michaela Bray and Professor Shunqi Pan


Alex is a currently a postdoctoral research assistant at University College London within the Civil, Environmental and Geomatic Engineering Department (CEGE).  He joined UCL in February 2020.  Alex enjoys an extremely varied role within the area of fluid dynamics, which involves conceptual, experimental, and numerical research into topics such as turbines, resource assessments, sustainable hydrogen production, and of late COVID-19 (project website: https://covid-19fluidmechanics.com).

Alex was a PhD student within the WISE Centre for Doctoral Training between 2015-2019 and was based at Cardiff University. His PhD focused on using Large-Eddy Simulation to simulate highly turbulent near-bed flows above porous gravel riverbeds. This research included the development of tools to allow complex 3-dimensional bodies to be represented in nodal form suitable for use with Immersed Boundary Methodology such as that applied within the in-house LES code Hydro3D.  As part of this research Alex created an artificial riverbed for experimental verification of a simulation developed using the finite volume LES code Hydro3D. From September to December 2018 Alex undertook a research placement in New Zealand collaborating with the University of Canterbury and Aqualinc Research Ltd to further his expertise and contribute to a wider project proposal.

Alex’s academic background before joining the WISE CDT was a Bachelors in Civil Engineering (BEng) at Cardiff University. Whilst there Alex volunteered for the charity Mothers of Africa as a finance and logistics co-ordinator for a 12-month project to install solar panels at a rural health post in Zambia.  This project culminated in two weeks onsite in Zambia in September 2014 installing the off-grid system.  Whilst at university Alex also worked as a Junior Site Engineer for MWH Treatment UK (now part of Stantec). This role focused on putting together a successful tender bid for a £7.5 million biological filter bed remedial scheme. Alex also undertook internships with Ch2m (now part of Jacobs) and Network Rail based in asset management teams prior to graduating in 2015 with a 2:1.

Outside of academia and industry, Alex has a wide range of interests including being a qualified swimming teacher, rock climbing and undertaking the restoration of classic cars.



Stubbs, A; Stoesser, T; Bockelmann-Evans, B. 2018. Developing an Approximation of a Natural, Rough Gravel Riverbed Both Physically and Numerically. Geosciences 8(12), 449. DOI: 10.3390/geosciences8120449.


2017 Summer School Research Presentation 

2017 Summer School Research Poster