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CV_26_ by tauben

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									                                Anthony Youd
                                    DoB 12/06/1980
                                   a.j.youd@ncl.ac.uk
                           http://www.staff.ncl.ac.uk/a.j.youd/


Education

         2002–2005    Ph.D. Bifurcations in forced Taylor–Couette flow
                      Supervisor: Prof. Carlo F. Barenghi
                      Newcastle University
         1998–2002    MMath. First class. A new bifurcation in Taylor vortex flow
                      Supervisor: Prof. Carlo F. Barenghi
                      Newcastle University
         1996–1998    A-Level Mathematics (B), Chemistry (B), French (C),
                      General Studies (B)
                      St. Edmund Campion R.C. School, Gateshead
                      (now Cardinal Hume R.C. School)




Grants and Awards

          2002–2005    EPSRC Ph.D. Studentship
          2002–2005    Newcastle University Alumni Fund Bursary
               2002    Rev. Gilbert Robertson Award for academic performance
               2002    Prize for best MMath. project
               2001    Stage 3 prize for academic performance




Employment
    Jan. 2010–present Teaching Support Officer
    School of Mathematics & Statistics, Newcastle University, NE1 7RU.

    Jan. 2007–Jan. 2010
    Oct. 2005–Mar. 2006 Assistant Computing Officer
    School of Mathematics & Statistics, Newcastle University, NE1 7RU.

    Mar. 2006–Jan. 2007 Post-doctoral Research Associate
    Department of Applied Mathematics & Theoretical Physics, University of Cambridge, CB3
    0WA.


Professional Memberships
  • Member of the Institute of Physics.




                                            1
Current Research
My main research interest is in Computational Fluid Dynamics (CFD) . I am currently involved
with projects studying the fluid mechanics of classical and MHD Taylor–Couette flow, as well
as the quantum fluid mechanics of Bose–Einstein condensation. I have developed two parallel
numerical codes, one of which I used in my Ph.D. research, and the latest of which solves the
Gross–Pitaevskii equation (GPE) in 3D using the Message Passing Interface (MPI).


Previous Research Experience
Mar. 2006–Jan. 2007 PDRA Mathematical models of superfluid turbulence
The goal of this project was to improve different mathematical models of superfluid turbulence
by developing hierarchies of new stochastic models of vortex motion and turbulence.
    In the brief time I spent on this project I developed a fourth-order finite-difference, fourth-
order adaptive time stepping, parallel 3D Gross–Pitaevskii equation (GPE) solver using MPI.
The code can solve different forms of the GPE for both homogeneous and non-homogeneous
(trapped) condensates, as well as many combinations of initial conditions, including vortex
lines, vortex rings, and the random phase approximation. The scalability of the code is excellent,
known results can be well reproduced, and development is ongoing.
    Once the initial testing was complete I began to investigate the random phase approximation
and strongly non-equilibrium initial conditions. This involves expressing the initial wavefunction
as a Fourier series where the phases of the complex amplitudes are randomly distributed. The
system undergoes transitions from a weak turbulence regime, to a strong turbulence regime,
and finally to a quasi-condensate regime characterised by the appearance of well-defined vortex
structures.
    I then started to examine the rate of decay of these vortex structures, and how the decay
rate is affected by the mass and energy density in the system. This work was published in
Phys. Rev. Lett.

2002–2005 Ph.D. Bifurcations in forced Taylor–Couette flow
The classical Taylor–Couette problem is the flow of an incompressible viscous liquid contained
in the gap between two concentric cylinders. Since Taylor’s pioneering work in the 1920s many
experiments and calculations have been performed. In the 1970s a variant of the problem was
introduced whereby the cylinders were temporally modulated about some mean rotation rate.
    In this research I extended the early linear results, and my MMath. work, to fully nonlinear
calculations using an existing spectral numerical code. I examined bifurcations and extended the
results into the non-axisymmetric 3D regime where I found a new class of modulated solutions.
    It has long been known that the presence of end-plates attached to the cylinders gives rise to
new solutions not found under the infinite cylinder approximation, so I developed a numerical
code to study the effects of the end-plates on the new modulated solutions.
    The final part of my research involved forcing the flow in a different way — using an applied
axial magnetic field. I extended my numerical code to allow for the existence of an external
field in both infinite and finite geometries and studied the effects of this field on the flows that
exist when the cylinders are very short. This led to the discovery that time-dependent flows are
easier to excite under the influence of an external magnetic field. Four papers and a conference
proceedings were published as a result of this work.




                                                2
Current Position
I am currently employed as Teaching Support Officer. My duties in this position are varied and
include:

   • Responsibility of the Computer Based Assessment system. This is a system whereby
     students sit assignments and exams at a computer rather than handing in written work.
     I author questions, maintain and expand the database behind the system, and provide
     support and advice to students and staff;

   • Contributing to teaching programmes by preparing materials and leading practical classes;

   • Supervision of Stage 4 MMath. project students;

   • Leading Maple computer practicals for Partners summer school students;

   • Providing support and advice to undergraduate and postgraduate students, and staff, in
     the use of mathematical and statistical software, and other software for scientific writing
     and presentation;

   • Designing, developing, and maintaining the School admissions database (using Microsoft
     Access);

   • Designing, developing, and maintaining the external School web site, as well as numerous
     internal sites (using XHTML);

   • Designing, developing, and maintaining conference and workshop websites (using PHP,
     XHTML, and MySQL);

   • Providing general IT support, including setup, installation, and maintenance of worksta-
     tions and servers, portable appliance testing (PAT), and display screen equipment (DSE)
     assessment.


Teaching Experience
   • Joint supervision of three MMath. project students on various aspects of Bose–Einstein
     condensation and superfluidity.

   • Tutor at the Maths-Aid centre in Newcastle — a Numeracy Support group helping students
     with mathematics and statistics queries. This requires clear and concise explanation of
     mathematical topics to students, some of whom may have learning difficulties.

   • Lead computer practical sessions on L TEX, Maple, and Stage 3 group projects.
                                         A


   • Provide software advice and support for all students in the School.

   • Previously led tutorial sessions on Modelling with Differential Equations throughout a
     semester, assisted with computer practicals, and marked homework/coursework.

Although I have not formally taught a lecture course, I believe my background in computational
mathematics would be ideally suited to teaching a course in the future, combining the numerical
solutions of PDEs with (parallel) programming concepts and graphics applications (an important
part of visualising and understanding numerical results which is often overlooked).
    The supervision of the three MMath. students led to the submission of two papers, and two
of the students decided to continue to study for a Ph.D.



                                              3
Other Skills
  • Knowledge of computational mathematics, fluid dynamics, and numerical analysis.

  • Extensive knowledge of the Fortran 90 programming language, including the use of modules
    and derived types, and object-oriented aspects of the language, such as operator overload-
    ing and polymorphism. I am also familiar with the linear algebra packages Lapack and
    ScaLapack, and the Fourier Transform library FFTw.

  • Experience in parallelising numerical codes using MPI (Message Passing Interface), and
    also some experience of OpenMP and High Performance Fortran (HPF).

  • An important part of my research has involved visualising data; I have much experience in
    using visualisation software packages such as OpenDX, VAPOR, and IDL, and the plotting
    program gnuplot. I am also familiar with the symbolic algebra package Maple.

  • Extensive knowledge of both software and hardware aspects of the Linux/Unix and Win-
    dows operating systems within a networked environment (including Active Directory).

  • Experience in Unix shell scripting with Bash and C Shell, and the use of Makefiles.

  • Experience with batch queue systems including Sun Grid Engine (SGE), Torque, and the
    High Throughput Computing system Condor.

  • Extensive knowledge of the L TEX typesetting system.
                               A


  • Experience with Learning Management Systems (LMS) such as Moodle, Ilias, and Black-
    board.

  • Comfortable interacting with staff, postgraduate, and undergraduate students alike, and
    versatile in communication on different skill levels.

  • I also have experience with the C, C#, and Python programming languages; the statisti-
    cal language R; XHTML, CSS, and PHP; database programming with MySQL, Firebird
    (Interbase), and Microsoft Access; and version management software such as CVS (Con-
    current Versions System) and SVN (Subversion).




                                             4
Publications
Mathematics/Physics
  8. White, A. C., Barenghi, C. F., Proukakis, N. P., Youd, A. J., & Wacks, D. H.
     2010 Non-classical velocity statistics in a turbulent atomic Bose–Einstein condensate.
     Phys. Rev. Lett. 104, 075301.

  7. Al-Amri, S. Z. Z., Youd, A. J., & Barenghi, C. F. 2008 Reconnection of superfluid
     vortex bundles. Phys. Rev. Lett. 101, 215302.

  6. Berloff, N. G. & Youd, A. J. 2007 Dissipative dynamics of superfluid vortices at
     non-zero temperatures. Phys. Rev. Lett. 99, 145301.

  5. Youd, A. J. & Barenghi, C. F. 2006 Hydromagnetic Taylor–Couette flow at very small
     aspect ratio. J. Fluid Mech. 550, 27–42.

  4. Youd, A. J. & Barenghi, C. F. 2005 Reversing and non-reversing modulated Taylor–
     Couette flow at finite aspect ratio. Phys. Rev. E 72, 056321.

  3. Youd, A. J., Willis, A. P. & Barenghi, C. F. 2005 Non-reversing modulated Taylor–
     Couette flows. Fluid Dyn. Res. 36, 61–73.

  2. Youd, A. J., Willis, A. P. & Barenghi, C. F. 2004 Hydromagnetic instabilities in
     Taylor–Couette flow at finite and infinite aspect ratios. In MHD Couette flows: Experi-
     ments and models, AIP conference proceedings 733, pp. 83–99.

  1. Youd, A. J., Willis, A. P. & Barenghi, C. F. 2003 Reversing and non-reversing
     modulated Taylor–Couette flow. J. Fluid Mech. 487, 367–376.


Other
  1. Fawcett L., Foster, W. H., & Youd A. J. 2008 Using computer based assessments
     in a large statistics service course. MSOR Connections 8, 45–48.


In preparation/revision
  3. Helm, J. L., Youd, A. J. & Barenghi, C. F. 2010 Slow vortex rings in a Bose
     condensate. In preparation.

  2. Tebbs, R., Youd, A. J. & Barenghi, C. F. 2010 The approach to vortex reconnection.
     arXiv:1006.3004.

  1. Youd, A. J. & Barenghi, C. F. 2010 Mode control of Taylor–Couette flow using an
     applied magnetic field. In revision.




                                            5
Talks and Presentations

  UK and International Conferences
  2009   16th International Couette–Taylor Workshop, 9–11 September, Princeton, NJ, USA
            Mode control in MHD Taylor–Couette flow
  2007   UKMHD Meeting, 7–8 June, Newcastle, UK
            Bifurcation control of MHD Taylor–Couette flow
  2005   14th International Couette–Taylor Workshop, 5–7 September, Sapporo, Japan
            Reversing and non-reversing modulated Taylor–Couette flow
            Hydromagnetic Taylor–Couette flow at very small aspect ratio
  2005   UKMHD Meeting, 26–27 May, Exeter, UK
            Hydromagnetic Taylor–Couette flow at very small aspect ratio
  2005   47th British Applied Mathematics Colloquium 4–7 April, Liverpool, UK
            Reversing and non-reversing modulated Taylor–Couette flow
  2003   13th Taylor–Couette Workshop, 3–5 July, Barcelona, Spain
            Reversing and non-reversing modulated Taylor–Couette flow


In addition, I have given numerous internal seminars on my research at the Applied Mathematics
Internal Seminar Series, and the Postgraduate Forum.


References
Prof. Carlo F. Barenghi        Prof. Anvar Shukurov            Dr. Michael G. Beaty
Ph.D. Supervisor               Ph.D. Advisor                   Computing Officer
School of Mathematics          School of Mathematics           School of Mathematics
& Statistics                   & Statistics                    & Statistics
Newcastle University           Newcastle University            Newcastle University
Newcastle upon Tyne            Newcastle upon Tyne             Newcastle upon Tyne
NE1 7RU                        NE1 7RU                         NE1 7RU
UK                             UK                              UK
c.f.barenghi@ncl.ac.uk         anvar.shukurov@ncl.ac.uk        m.g.beaty@ncl.ac.uk
+44 (0)191 222 7307            +44 (0)191 222 5398             +44 (0)191 222 7238

Dr. Natalia G. Berloff           Prof. Rainer Hollerbach
PDRA Supervisor                 Ph.D. Examiner
Department of Applied           Department of Applied
Mathematics & Theoretical       Mathematics
Physics                         University of Leeds
University of Cambridge         Leeds
Cambridge                       LS2 9JT
CB3 0WA                         UK
UK                              rh@maths.leeds.ac.uk
n.g.berloff@damtp.cam.ac.uk      +44 (0)113 343 7101
+44 (0)1223 337860




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