ELFT HÍRADÓ

[Insperger Tamás <inspi AT mm.bme.hu>]

MEGHÍVÓ


Prof. Laurent Monier
Institut National des Sciences Appliquées de Rennes
Centre de Mathématiques

Three dimensional modelisation of the ocean circulation

címmel előadást tart

2007. február 21-én (szerdán) 10.15 órakor

Az előadás helye: Műszaki Mechanikai Tanszék Könyvtára ("MM" épület I. 
em. 29).

Minden érdeklődőt szívesen látunk.

Abstract
In this talk we develop a numerical simulation of the variability of the 
oceanic currents in a parallelepipedic canal. The domain is 
characterized by great differences between horizontal and vertical 
scales, which oblige to use adimensional equations. In order to obtain 
the variations of the currents with respect to time and depth, we have 
to use a three dimensional and time dependent model. The sea surface 
topography, related to the surface pressure, is unknown in our problem. 
For this reason, we have connected a shallow-water model with the three 
dimensional model. Physical variables computed by the two dimensional 
model are the velocity of the horizontal flow integrated with respect to 
depth in the surface layer and the topography of the sea surface. These 
variables are controlled by the shallow water equations. Variables 
computed by the three dimensional model are the three components (u,v,w) 
of the current. Velocity (u,v,w) obeys to the Navier-Stokes equations. 
The sea level topography present in these equations is given by the 
shallow-water model. The model is carried out in a rectangular canal of 
longitudinal extension L=500 km, latitudinal extension L=1500 km and 
vertical extension H=200 m (thickness of the surface layer) .The domain 
is located in the south hemisphere and in the tropical zone.