ELFT HÍRADÓ

[szpl <szpl AT metal.elte.hu>]

ELTE Fizikai Intézet

                                ORTVAY KOLLOKVIUM

                    2018. december 6., csütörtök, 15:00-kor
                Az ELTE Pázmány Péter s. 1/A alatti épületében
                           földszinti 0.81 előadóban


                                George Haller
                                (ETH Zürich)

            Material barriers and enhancers to diffusive transport


Kivonatos ismertetés:
Observations of tracer transport in fluids generally reveal highly complex 
patterns shaped by an intricate network of transport barriers and enhancers. 
The elements of this network appear to be universal for small diffusivities, 
independent of the tracer and its initial distribution.

In this talk, I discuss a mathematical theory  to predict these transport 
barriers and enhancers solely from the flow velocity, without reliance on 
expensive diffusive or stochastic simulations. This theory yields a simplified 
computational scheme for diffusive transport problems, such as the estimation 
of salinity redistribution for climate studies and the forecasting of oil 
spill spreads on the ocean surface. I will illustrate the results on turbulence
simualtions and observational ocean velocity data.