ELFT HÍRADÓ

["Laszlo Dobos" <dobos AT complex.elte.hu>]

-----Original Message-----
From: Zsolt Sandor 
[mailto:szsolt AT caesar.elte.hu]
 
Sent: Friday, July 21, 2017 11:43 AM
To: Laszlo Dobos 
<dobos AT complex.elte.hu>
Subject: meghívó

MEGHÍVÓ
 
Az ELTE Matematikai Intézetének RENDKÍVÜLI intézeti szemináriumára az 
MTA-ELTE Numerikus Analízis és Nagy Hálózatok Kutatócsoport és a Farkas 
Miklós Alkalmazott Analízis Szeminárium támogatásával.
 
Előadók:
Randall J. LeVeque                                                            
                  
Boeing Professor of Applied Mathematics                                       
                                          
University of Washington
 
Marsha Berger
Courant Institute, NYU
 
Helyszín: Déli épület –1-820 Hajós terem
Időpont: 2017. július 31.- hétfő - 10.00 órai kezdet
 
Az előadások:
 
1. Előadás 10:00 órától – 11:00 óráig : Adjoint Error Estimation for Adaptive 
Refinement of Hyperbolic PDEs 
 
Előadó: Randall J. LeVeque, a SIAM Board of Trustees tagja valamint a SIAM 
Journals Committee elnöke
 
Absztrakt:
Time-dependent hyperbolic partial differential equations can be efficiently 
solved using adaptive mesh refinement, with a hierarchy of finer grid patches 
in regions where the solution is discontinuous or rapidly varying.  These 
patches can be adjusted every few time steps to follow propagating waves.  
For many problems the primary interest is in tracking waves that reach one 
target location, perhaps after multiple reflections.  The solution to an 
adjoint equation solved backward in time from the target location can be used 
to identify the regions that require refinement.  These adjoint methods are 
incorporated in the Clawpack software for general hyperbolic problems and 
have been used in the GeoClaw software to track tsunami waves in the ocean 
that will reach a particular community of interest. 
 
 
2. előadás 11:15 órától – 12:15 óráig : Modeling and Simulation of 
Asteroid-Generated Tsunamis
 
Előadó:  Marsha Berger Courant Institute, NYU

Absztrakt:
In 2013, an uncharted asteroid exploded in the atmosphere over Chelyabinsk, 
causing damage for a radius of 20 kilometers. We examine the question of what 
would happen if an asteroid burst over water instead of land. Could it 
generate a tsunami that would cause widespread damage far away?

We present numerical simulations using the GeoClaw software and the shallow 
water equations in a variety of settings. We have a model problem with an 
explicit solution that explains the phenomena found in the computations. 
Finally, we discuss whether compressibility and dispersion are important 
effects that should be included, and show results using the linearized Euler 
equations that begin to address this.