Regensburg 2010 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 30: Posters II

DY 30.40: Poster

Donnerstag, 25. März 2010, 16:00–18:00, Poster C

A Lagrangian model for the evolution of turbulent magnetic and passive scalar fields — •Thorsten Hater, Holger Homann, and Rainer Grauer — Institut für Theor. Physik I, Ruhr-Universität Bochum

We present an extension of the Recent Fluid Deformation (RFD) closure introduced by Chevillard and Meneveau (2006) which was depeloped for modelling the time evolution of Lagrangian fluctuations in incompressible Navier-Stokes turbulence. We apply the RFD closure to study the evolution of magnetic and passive scalar field fluctuations. This comparison is especially interesting since the stretching term for the magnetic field and the passive scalar are similar but differ by a sign such that the effect of stretching and compression by the turbulent velocity field is reversed.

Probability density functions (PDFs) of magnetic and passive scalar field fluctuations using the RFD closure are compared against PDFs obtained from direct numerical simulations.