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Dr. Ashley P. Willis*

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Senior Lecturer of Applied Mathematics
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Room H12,
Hicks Building
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School of Mathematics and Statistics
University of Sheffield
S3 7RH, U.K.
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+44 (0)114 2223746
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a.p.willis /a/ sheffield.ac.uk
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Office hours: I'm usually in H12 or around.
Please email to be sure.
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2010/18-present: * Lecturer/Senior Lecturer*, School of Mathematics & Statistics, University of Sheffield, U.K.

2008-10:

2005-08:

2002-05:

2002:

**Collaborator's pages **

Elena Marensi , EPSRC Research Assocate, Sheffield, Optimization in Fluid Mechanics ;

Marc Avila Bremen; Predrag Cvitanović Georgia Tech ( chaosbook.org ); Yohann Duguet LIMSI, Paris; Dave Gubbins Leeds; Yongyun Hwang Imperial; Rich Kerswell DAMTP, Cambridge; Jeorge Peixinho PIMM, Paris.

Sheffield Fluid Dynamics Group

SoMaS Applied Mathematics Seminars

**Some of my work: **

I am the founder and owner of
openpipeflow.org,
a free and fast simulation code for the study of pipe flow,
particularly as a dynamical system.
Non-problem-specific codes for dynamical systems include...

A Jacobian-free Newton-Krylov (JFNK) code for finding solutions of high-dimensional nonlinear equations (or low-dimensional if you like!).

I've written a Double pendulum android app: with two double-pendula side-by-side, it is specifically designed to show how initially similar states diverge - the chaotic system exhibits sensitivity to initial conditions (SIC). It also shows how the chaotic paths follow particular repeating patterns, periodic orbits.

Publications can be found on my Google Scholar page or here: Publications + preprints

A description of the mathematics behind the following videos can be found here.

**PhDs: **

I am looking for motivated students
who would like to
apply and broaden their mathematical skills.
As the focus of my projects is usually
on **the development of mathematical methods** and **the study of dynamical systems**,
I expect you to be familiar with differential equations
and vector calculus, but you do not need to have taken advanced courses
on fluids.

The modelling of **fluid flows** is perhaps the traditional
test-bed for the development of new methods.
Often, even simple-looking setups exhibit all sorts
of interesting phenomena, and
our understanding of nature is greatly
enhanced through **numerical simulation** and experiments.

I am particularly interested in the appearance of
**turbulence** in fluid flows,
and in modelling flows in the interior of planets. The latter is
usually responsible for the generation of planetary **magnetic fields**.

For further information **please contact me**.
The following links to snippets of my work may also be of interest:
Turbulence.
Dynamos.

Please note that all PhD applications must be made through the university system: School info on PhD places.