Parallel Computing Resources for the UK MHD Community
Lead Research Organisation:
University of St Andrews
Department Name: Mathematics and Statistics
Abstract
Virtually all material in the universe consists of an ionised gas called a plasma. Plasmas conduct electricity and interact with magnetic fields, producing many physical phenomena not easily reproduced in laboratories on Earth. The large-scale behaviour of these plasmas can be predicted by using a known set of complicated mathematical equations, called the equations of Magnetohydrodynamics (MHD). The solutions of MHD equations can describe the behaviour of plasmas in which collisions dominate the physical processes, such as (i) the generation of magnetic fields through a process known as dynamo action, (ii) the release of a staggering amount of magnetic energy in a large solar flare by magnetic reconnection, (iii) the small scale chaotic motions of turbulence in a magnetised plasma, (iv) the fact that solar atmosphere is much hotter than the solar surface and (v) the way in which gigantic eruptions of solar plasma interact with the Earth's magnetic field to produce the Aurora. When collisional effects are weak, in low-density plasmas and in problems involving short length-scales, the more fundamental kinetic equations must be solved. However, the solution of both sets of equations require extremely large computers and the best way is to link several hundred computers together and get them all working on a fraction of the large problem. These computers are called parallel computers. The UK effort in this research area is at the forefront of the worldwide effort to understand how the Sun, the Solar System and astrophysical plasmas work. While this work is essentially theoretical, it is driven by the observations of the present fleet of solar and astrophysical ground and space-based observatories.
Organisations
Publications
Pascoe D
(2008)
Sausage oscillations in loops with a non-uniform cross-section
in Astronomy & Astrophysics
Pascoe D
(2013)
Fast magnetoacoustic wave trains in magnetic funnels of the solar corona
in Astronomy & Astrophysics
Pechhacker R
(2012)
Electron cyclotron maser emission mode coupling to the z-mode on a longitudinal density gradient in the context of solar type III bursts
in Physics of Plasmas
Pechhacker R
(2014)
Three-dimensional particle-in-cell simulation of electron acceleration by Langmuir waves in an inhomogeneous plasma
in Physics of Plasmas
Pechhacker R
(2012)
The effect of electron beam pitch angle and density gradient on solar type III radio bursts
in Physics of Plasmas
Pontin D
(2011)
Three-dimensional magnetic reconnection regimes: A review
in Advances in Space Research
Pontin D
(2009)
LAGRANGIAN RELAXATION SCHEMES FOR CALCULATING FORCE-FREE MAGNETIC FIELDS, AND THEIR LIMITATIONS
in The Astrophysical Journal
Pontin D
(2012)
ON THE FORMATION OF CURRENT SHEETS IN RESPONSE TO THE COMPRESSION OR EXPANSION OF A POTENTIAL MAGNETIC FIELD
in The Astrophysical Journal
Pontin D
(2011)
Generalised models for torsional spine and fan magnetic reconnection
in Astronomy & Astrophysics
Pontin D
(2013)
ON THE NATURE OF RECONNECTION AT A SOLAR CORONAL NULL POINT ABOVE A SEPARATRIX DOME
in The Astrophysical Journal
Pontin D
(2010)
Dynamics of braided coronal loops II. Cascade to multiple small-scale reconnection events
in Astronomy & Astrophysics
Pontin DI
(2012)
Theory of magnetic reconnection in solar and astrophysical plasmas.
in Philosophical transactions. Series A, Mathematical, physical, and engineering sciences
Priest E
(2009)
Three-dimensional null point reconnection regimes
in Physics of Plasmas
Proctor M. R. E.
(2009)
EFFECTS OF FLUCTUATION ON MEAN-FIELD a-O DYNAMOS
in MAGNETOHYDRODYNAMICS
Russell A
(2013)
Production of small-scale Alfvén waves by ionospheric depletion, nonlinear magnetosphere-ionosphere coupling and phase mixing
in Journal of Geophysical Research: Space Physics
Russell A
(2013)
Solar flares and focused energy transport by MHD waves
in Astronomy & Astrophysics
Russell A
(2013)
PROPAGATION OF ALFVÉNIC WAVES FROM CORONA TO CHROMOSPHERE AND CONSEQUENCES FOR SOLAR FLARES
in The Astrophysical Journal
Schmitz H
(2013)
The effect of initial conditions on the electromagnetic radiation generation in type III solar radio bursts
in Physics of Plasmas
Schrijver C
(2013)
PATHWAYS OF LARGE-SCALE MAGNETIC COUPLINGS BETWEEN SOLAR CORONAL EVENTS
in The Astrophysical Journal
Scullion E
(2009)
JETS IN POLAR CORONAL HOLES
in The Astrophysical Journal
Shelyag S
(2009)
Acoustic wave propagation in the solar sub-photosphere with localised magnetic field concentration: effect of magnetic tension
in Astronomy & Astrophysics
Silvers L
(2009)
Interactions between magnetohydrodynamic shear instabilities and convective flows in the solar interior
in Monthly Notices of the Royal Astronomical Society
Simitev R
(2012)
HOW FAR CAN MINIMAL MODELS EXPLAIN THE SOLAR CYCLE?
in The Astrophysical Journal
Simitev R
(2009)
Bistability and hysteresis of dipolar dynamos generated by turbulent convection in rotating spherical shells
in EPL (Europhysics Letters)
Simões P
(2013)
IMPLOSION OF CORONAL LOOPS DURING THE IMPULSIVE PHASE OF A SOLAR FLARE
in The Astrophysical Journal
Sreenivasan B
(2011)
Helicity generation and subcritical behaviour in rapidly rotating dynamos
in Journal of Fluid Mechanics
Taroyan Y
(2009)
Heating Diagnostics with MHD Waves
in Space Science Reviews
Teed R
(2012)
On the necessary conditions for bursts of convection within the rapidly rotating cylindrical annulus
in Physics of Fluids
Thurgood J
(2012)
Linear and nonlinear MHD mode coupling of the fast magnetoacoustic wave about a 3D magnetic null point
in Astronomy & Astrophysics
Tobias S
(2011)
ON THE GENERATION OF ORGANIZED MAGNETIC FIELDS
in The Astrophysical Journal
Tobias S
(2011)
ASTROPHYSICAL FLUID DYNAMICS VIA DIRECT STATISTICAL SIMULATION
in The Astrophysical Journal
Tobias S
(2013)
On the measurement of the turbulent diffusivity of a large-scale magnetic field
in Journal of Fluid Mechanics
Tsiklauri D
(2010)
Vlasov - Maxwell, Self-consistent Electromagnetic Wave Emission Simulations in the Solar Corona
in Solar Physics
Tsiklauri D
(2012)
Three dimensional particle-in-cell simulation of particle acceleration by circularly polarised inertial Alfven waves in a transversely inhomogeneous plasma
in Physics of Plasmas
Tsiklauri D
(2011)
Galaxy rotation curves: the effect of $\vec{j} \times\vec{B}$ force
in Astrophysics and Space Science
Tsiklauri D
(2011)
Heating of solar chromosphere by electromagnetic wave absorption in a plasma slab model
in Physics of Plasmas
Tsiklauri D
(2011)
An alternative to the plasma emission model: Particle-in-cell, self-consistent electromagnetic wave emission simulations of solar type III radio bursts
in Physics of Plasmas
Tsiklauri D
(2011)
Particle acceleration by circularly and elliptically polarised dispersive Alfven waves in a transversely inhomogeneous plasma in the inertial and kinetic regimes
in Physics of Plasmas
Tsiklauri David
(2009)
Missing pieces of the solar jigsaw puzzle
in ASTRONOMY & GEOPHYSICS
Vidotto A
(2013)
Effects of M dwarf magnetic fields on potentially habitable planets
in Astronomy & Astrophysics
Wareing C
(2012)
RECONCILING THE EMISSION MECHANISM DISCREPANCY IN MIRA'S TAIL AND ITS EVOLUTION IN AN INTERFACE WITH SHEAR
in The Astrophysical Journal
Wareing C
(2013)
A composite equation of state for the modeling of sonic carbon dioxide jets in carbon capture and storage scenarios
in AIChE Journal
Wilmot-Smith A
(2011)
Heating of braided coronal loops
in Astronomy & Astrophysics
Wilmot-Smith A
(2009)
MAGNETIC BRAIDING AND PARALLEL ELECTRIC FIELDS
in The Astrophysical Journal
Wilmot-Smith A
(2010)
Dynamics of braided coronal loops I. Onset of magnetic reconnection
in Astronomy and Astrophysics
Wilmot-Smith A
(2009)
MAGNETIC BRAIDING AND QUASI-SEPARATRIX LAYERS
in The Astrophysical Journal
Woolley R
(2013)
Experimental measurement and Reynolds-averaged Navier-Stokes modelling of the near-field structure of multi-phase CO2 jet releases
in International Journal of Greenhouse Gas Control
Wyper P
(2012)
Spine-fan reconnection The influence of temporal and spatial variation in the driver
in Astronomy & Astrophysics
Wyper P
(2013)
Reconnection at three dimensional magnetic null points: Effect of current sheet asymmetry
in Physics of Plasmas
Wyper P
(2013)
Kelvin-Helmholtz instability in a current-vortex sheet at a 3D magnetic null
in Physics of Plasmas
Description | The computations carried out with this equipment has shown us how magnetic fields play a crucial role in many astrophysical objects such as the Sun, stars, accretion discs and galaxies. |
Exploitation Route | The research results will be used to extend our knowledge and suggest new areas for research. Our work has stimulated others to use many of our computational techniques in other areas of research. |
Sectors | Education,Other |