PHYSICAL MATHEMATICS SEMINAR


TOPIC:		ANOTHER APPROACH FOR MODELING RADIATING,
		MHD AND SELF-GRAVITATING FLOWS IN ASTROPHYSICS


SPEAKER:	AHMAD HUJEIRAT
		University Observatory
		Institute of Applied Mathematics
		Landessternwarte-Koenigstuhl
		GERMANY

ABSTRACT:

In this talk I will review some recent numerical methods used
computational astrophysics, and present an efficient implicit numerical
solver for searching steady solutions for the set of equations
corresponding to multi-dimensional, multi-components, radioactive,
magnetized and self-gravitating flows.

The solver-package can be applied to various problems in astrophysics
ranging from the core-collapse of weakly ionized self-gravitating
molecular clouds to relativistic accretion onto black holes and neutron
stars.  Strongly stratified and weakly incompressible fluid flows can be
treated as well.

The solver runs on PCs and local workstations with serial and Shared
memory architectures and capable of performing several hundred thousands
time steps for strongly time-dependent problems.  For purely HD problems,
solutions can be obtained on the scale of hours.  Some results confirming
the super-efficiency and robustness of the method will be presented.

Finally, I will discuss ways of extending this 3D exi-symmetric solver to
fully 3D, and present some preliminary results.


DATE:		TUESDAY, DECEMBER 5, 2000

TIME:		2:30 PM

LOCATION:	Building 2, Room 338


Refreshments will be served at 3:30 PM in Room 2-349


Massachusetts Institute of Technology
Department of Mathematics
Cambridge, MA  02139