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**Applied Mathematics Seminars**- Previous Applied Seminars
- Applied Mathematics Seminars Spring 2016
- Applied Mathematics Seminars Autumn 2015
- Applied Mathematics Seminars Summer 2015
- Applied Mathematics Seminars Spring 2015
- Applied Mathematics Seminars Autumn 2014
- Applied Mathematics Seminars Summer 2014
- Applied Mathematics Seminars Spring 2014
- Applied Mathematics Seminars Autumn 2013
- Applied Mathematics Seminars Spring 2013
- Applied Mathematics Seminars Autumn 2012
- Applied Mathematics Seminars Summer 2012
- Applied Mathematics Seminars Spring 2012
- Applied Mathematics Seminars Autumn 2011
- Applied Mathematics Seminars Spring 2011
- Applied Mathematics Seminars Autumn 2010
- Applied Mathematics Seminars Spring 2010
- Applied Mathematics Seminars Autumn 2009
- Applied Mathematics Seminars Spring 2009
- Applied Mathematics Seminars Autumn 2008
- Applied Mathematics Seminars Spring 2008
- Applied Mathematics Seminars Autumn 2007

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## Applied Mathematics Seminars

### Summer 2016

All seminars (unless otherwise stated) will take place on **Tuesdays at
3.00pm in ****Room 505 in the Mathematics Department **(25 Gordon Street). See see how to find us for further details. There will be tea afterwards in Mathematics Room 606. If
you require any more information on the Applied seminars please
contact Prof Slava Kurylev e-mail: y.kurylev AT ucl.ac.uk or
tel:
020-7679-7896.

### Special Applied Seminar, Tuesday 14 June 2016 in Room 505 at 4:30pm

#### Wiliam K Devar (The Pierre Welander Professor of Oceanography, Florida State University)

###### Title: Gulf Stream Separation Dynamics

**Abstract:**

Numerical models are plagued by poor representations of Gulf Stream separation. Rather than moving to the deep ocean at Cape Hatteras, many model Gulf Streams 'overshoot' the separation, exiting the US east coast several degrees to the north of Cape Hatteras. This is responsible for the largest bias in ocean SST found in coupled climate models. Higher model resolution often helps, but even then correct separation is not guaranteed. We examine Gulf Stream separation in a regional model with a view towards understanding the dynamical controls on separation. Our results support the convergence of the isobaths northeast of the Charleston Bump as the key element. Initial tests of a theoretical explanation based on mean flow-topography interaction support the result.

### Tuesday 5 July 2016 in Chadwick B.05 LT at 3pm

#### Florian deVuyst (ENS-Cachan, France)

###### Title: New numerical solvers subject to HPC performance constraints: Lagrange-flux approach for compressible hydrodynamics and Saint-Venant equations. Related Big Data problems with CFD computations.

**Abstract:**

Today's multicore/manycore computing architecture allow for
potential high-performance computing but numerical solvers need suitable
scalability with SIMD feature and rather high arithmetic intensity for that.
This new constraint make the Numerical Analysis community search for new
computational approaches, possibly changes of paradigm while trying to keep
expected features like high-order accuracy, stability. This talk will present
an instance of evolution of solvers: starting from a family of Lagrange+remap
solvers for compressible Hydrodynamics, we will achieve a performance
analysis from performance models (roofline, ECM). We will reinterpret the
geometrical remapping step as an algebraic convection process which has a far
better SIMD feature. The resulting solver, referred to as Lagrange-flux solver
is actually very general and can be applied to a broad class of
convection-dominated problems. We will extend the scheme to the shallow-water
equations, achieving the "well-balanced" property for the gravity
source term. We will also discuss the issue of handling dry/wet zones
without interface tracking, still for the sake of performance. See the video : https://youtu.be/6C3HcjtsYsE
. Finally, we will discuss current and outlook research about Big Data aspects
from simulations of debris deposition caused by marine flooding.

Page last modified on 15 jun 16 11:18