Research interests

A list of publications is available separately.

Flow over orography

I am currently working as a Research Fellow within the Atmospheric Dynamics group in the School of the Environment. My research, funded by NERC through UWERN, is investigating 'Flow Over Orography'. I am involved in a variety of projects including a mixture numerical, theoretical and experimental work. Some of my current interests include :-

Dynamics of flow in forest canopies.

The presence of a forest canopy on a hill can make a significant difference to the flow in the boundary layer over the hill. This can impact on important phenomena such as flow separation and drag. I have been investigating this using numerical simulations and also through linear analytic solutions of the boundary layer equations.

Profiles of change in speed over a
forested hill

Profiles of the change in wind speed over a small forested hill. Both numerical and theoretical results are shown. The reversed flow within the canopy over the lee slope is shown.

Turbulence closure schemes for boundary layer flow.

There are a variety of turbulence closure schemes in wide (and not so wide) use for boundary layer flows. I have worked on comparing various first and second order schemes with wind tunnel measurements in neutral and stratified flow to assess the schemes suitability in modelling flow over a hill. I have also been invesigating the use of second order closure schemes for flow over canopied hills. The presence of flow separation in the canopy makes this a difficult problem.

PV generation in mountain valleys

Using numerical simulations I have been investigating the generation of PV near the surface in mountain passes and it's subsequent advection out of the boundary layer to form PV banners.

PV generated through a mountain pass

2-D numerical simulation of flow through a mountain pass showing generation of PV at the valley sides. The solid lines are isotherms and the dotted lines are contours of equal Bernoulli potential. This plot was generated using blasvis.

Gravity currents

I studied for my PhD in the fluid dynamics laboratory in DAMTP, University of Cambridge. The title of my thesis was "Gravity currents on slopes". As I was partly sponsored by the Health and Safety Laboratories the motivation was to model the dispersion of dense gases in the atmosphere. My work consisted of a mixture of laboratory experiments, numerical simulations and theoretical modelling.

More recently I have continued my interests in this field looking at simple models for the role of surface fluxes in cold pool evolution using shallow water theory. Interesting analogies can be made with sedimenting gravity currents.

Instantaneous release on a slope

A gravity current in the lab. This is an instantaneous release of salty water into fresh water, on a slope.

Numerical simulation of 2-D gravity

This is a numerical simulation of a 2-D lock release gravity current.

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Andrew Ross <>
Last updated: 30 May 2004