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DY: Fachverband Dynamik und Statistische Physik

DY 24: Turbulence and wind energy

DY 24.4: Vortrag

Donnerstag, 25. März 2010, 10:45–11:00, H47

Eulerian and Lagrangian statistics in compressible fluid turbulence — •Christian Schwarz and Rainer Grauer — Institut für Theor. Physik I, Ruhr-Universität Bochum

In order to get insight in statistical properties of turbulent compressible flows numerical simulations using a conservative shock capturing CWENO scheme were performed. In particular, the connection between the PDFs of the Eulerian and Lagrangian velocity increments will be discussed and compared to recent theories developed for incompressible flows. Due to the compressibility of the flow the influence of the density fluctuations can clearly be seen in the velocity increments as well as in the corresponding structure functions. A way to take into account the effect of compressibility on the statistics will be presented.

In order to get long time statistics especially necessary in compressible flows a new framework cudaHYPE is under development. This framework solves the compressible Euler equations on a cluster of graphics cards. First results will be presented.