IAS Benjamin Meaker Visiting Professor Marius Ungarish, Technion-Israel Institute of Technology, Haifa, Israel

BMVP Marius Ungarish

The effects of mixing on the atmospheric dispersion of volcanic ash and the long runout of oceanic particle-laden flows

30 July - 31 August 2017

Professor Ungarish was post-doc and lecturer at MIT (Applied Math) and is member of Computer Science Dept. at Technion Haifa since 1985; presently full professor with chair. Hold visiting position at Universities of Cambridge, Grenoble, Vienna (TU), Florida (at Gainesville), Taiwan (Taipei) and Witwatersrand (Johannesburg). He has published two well-received professional books, and about 100 papers in high-quality journals. Professor Ungarish has served as an advisor to eleven MSc and PhD students, and teaches courses on numerical analysis, numerical solutions of partial differential equations, modelling/simu lation of fluids.

Flows driven by density difference are ubiquitous in industry and the environment and arguably include some of the longest range events that are known on earth. For example, volcanic ash can be transported through the atmosphere over many thousands of kilometers, while oceanic slumps of sediment may transport particles across entire ocean basins. The proposed study seeks to improve understanding of these motions through the development of a new generation of predictive mathematical models, which do not rely solely on computational simulations, but rather draw out the dynamical relationships between the conditions at the source, the surrounding fluid and flow features such as the rate of propagation and the deposit that these flow emplace.

These new quantitative models will seek to synthesise current approaches, one of which neglects mixing with the surroundings as the flow evolves and the other of which neglects density-driven flow processes. The models will be fundamental and generic, potentially employable in many situations, but the application to the computatlon of the atmospheric transport and dispersion of volcanic ash is of particular importance, since there is an operational need to predict ash concentration following explosive eruptions in order to assess the hazard to aircraft flight.

During his stay in Bristol, Professor Ungarish will be hosted by Professor Andrew Hogg (Mathematics).

Gravity currents and intrusions: simple mathematical models for complex physical phenomenon.
Four one-hour weekly seminars for graduate/postgraduate students, based on the book written by the visitor and on recent relevant papers. The course will emphasize the methodology and questions open for research, and encourage discussion.
This course will be offered to students in mathematics/engineering/earth science/geography

Departmental Seminar: Novel extensions to Benjamin's classical gravity current solution

Dates and times tbc