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DY: Fachverband Dynamik und Statistische Physik
DY 55: Poster: Turbulence; Complex Fluids; Microfluidics; Droplets and Wetting
DY 55.10: Poster
Donnerstag, 19. März 2020, 15:00–18:00, P1A
Small-scale simulations of high Reynolds number turbulence — •Niklas Schnierstein1,2 and Michael Wilczek1 — 1Max Planck Institute for Dynamics and Self-Organization, Göttingen, Germany — 2Georg-August University, Göttingen, Germany
Three-dimensional turbulence is a multi-scale problem, in which energy is transferred from the largest, energy-containing scales to the smallest, dissipative scales. The separation of these scales increases with the Reynolds number. Thus, resolving all scales of a turbulent flow in direct numerical simulations (DNS) is for many realistic problems computationally prohibitive. However, in some problems, one is only interested in certain scales of the flow. One example is the formation of microdroplets in clouds, for which small-scale turbulence is of crucial importance. For this reason, we explore the possibility of generating a realistic small-scale turbulent flow while adequately modeling the larger scales using stochastic processes. By controlling the parameters of these processes, we can precisely impose key statistical quantities on the flow, such as the energy spectrum and the correlation time. We investigate different methods of coupling the modeled and the resolved scales, characterize the generated flow field, and compare it to fully resolved DNS to analyze the advantages and limitations of this approach.