[SEMINARI] Interfaces in Numerical Relativistic Hydrodynamics, Stephen Millmore

[Enric Marco]

Interfaces in Numerical Relativistic Hydrodynamics

Dr. Stephen Millmore

School of Mathematics, University of Southampton, England.

Seminari del departament d'Astronomia i Astrofisica

Dijous 17 juny 2010

15:00

Resum

Current non-linear numerical simulations of neutron stars use single 
component models. However, evidence suggests that there are several 
different regions present within a neutron star. Qualitatively different 
behaviour is expected to occur within these regions and can be 
characterised by the equation of state. Problems arise when modelling a 
single component neutron star with a spatially varying equation of 
state, due to instabilities in the numerical methods. An alternative 
method of dealing with these regions is to use a multicomponent model. 
In such a case, level set methods can be used to track the interface 
between components. Boundary conditions must then be chosen and imposed 
at any interfaces to model the interaction between the fluid components 
correctly. Such techniques have been used with success in Newtonian 
computational fluid dynamics. Here I shall present an extension of these 
techniques to relativistic situations, and construct a simple 
multicomponent star model in general relativity by applying this 
extension. I then will provide some insight into the extension of these 
techniques for multidimensional situations.

http://celeste.uv.es/daa/seminari.php?id=1027

-- 
/------------------------------------\
 Dr. Enric Marco
 Departament d'Astronomia i Astrofísica
 Facultat de Física
 Universitat de València
 C/  Dr. Moliner, 50
 46100 Burjassot, Spain
 Phone: (34)-96-354-3069
 Fax:(34)-96-354-3084
 enric.marco en uv.es
 http://www.uv.es/marco
 http://www.uv.es/aulaastronomia
 http://www.uv.es/daa
 \--------------------------------------/