Convection and Dynamo in the Earth's Fluid Core
Lead Research Organisation:
UNIVERSITY OF EXETER
Department Name: Engineering Computer Science and Maths
Abstract
Constructing numerical geodynamo models with sufficient geophysical realism on modern massively parallel computers is of both practical and scientific importance. Supported by a NERC grant (NER/O/S/2001/01262, running 01/10/2003 to 26/12/2007), we have taken a major step towards the development of a new generation, EBE (element-by-element) finite element geodynamo code that has two main significant advantages: it is particularly suitable for modern massively parallel computers achieving nearly linear scalability and it is highly flexible to be capable of incorporating geophysical realism such as non-spherical geometry and local variations. This application requests funding for one PDRA at Exeter to continue/extend our existing productive research on the asymptotic convection study and geodynamo modeling and to advance our understanding of the spatial and temporal structure of non-magnetic nonlinear convection in the Earth's liquid core and of how the convection-driven geodynamo operating in an electrically conducting fluid core and the pattern of magnetic flux emanating from the Earth's liquid core are affected by an electrically heterogeneous lower mantle.
Organisations
People |
ORCID iD |
Keke Zhang (Principal Investigator) |
Publications
Zhang K
(2017)
Asymptotic theory for torsional convection in rotating fluid spheres
in Journal of Fluid Mechanics
Zhang K
(2015)
Inertial convection in a rotating narrow annulus: Asymptotic theory and numerical simulation
in Physics of Fluids
Zhang K
(2012)
Asymptotic theory of resonant flow in a spheroidal cavity driven by latitudinal libration
in Journal of Fluid Mechanics
Zhang K
(2013)
The non-resonant response of fluid in a rapidly rotating sphere undergoing longitudinal libration
in Journal of Fluid Mechanics
ZHANG K
(2011)
On fluid motion in librating ellipsoids with moderate equatorial eccentricity
in Journal of Fluid Mechanics
Zhang K
(2010)
On fluid flows in precessing spheres in the mantle frame of reference
in Physics of Fluids
Zhang K
(2015)
THERMAL-GRAVITATIONAL WIND EQUATION FOR THE WIND-INDUCED GRAVITATIONAL SIGNATURE OF GIANT GASEOUS PLANETS: MATHEMATICAL DERIVATION, NUMERICAL METHOD, AND ILLUSTRATIVE SOLUTIONS
in The Astrophysical Journal
Zhang K
(2014)
On precessing flow in an oblate spheroid of arbitrary eccentricity
in Journal of Fluid Mechanics
ZHANG K
(2010)
On fluid flows in precessing narrow annular channels: asymptotic analysis and numerical simulation
in Journal of Fluid Mechanics
Description | We have discovered the possible resonance in planetary systems due to libration. A new asymptotic theory for the classical problem of thermal convection in rotating spheres is developed. |
Exploitation Route | The findings have motivated several lab/numerical experiments. |
Sectors | Aerospace, Defence and Marine,Other |
Description | My findings presented in my theory have been confirmed several lab experiments. |
First Year Of Impact | 2013 |
Sector | Aerospace, Defence and Marine,Other |
Impact Types | Cultural |