Vortrag Dr. Alan R. Kerstein

Institut für Strömungstechnik und Thermodynamik (ISUT), Freitag, den 09. November 2012, 11:00 Uhr s.t.

Vortragende/r: Dr. Alan R. Kerstein
Institut: former Senior Researcher at the Combustion Research Facility, SANDIA National Laboratory
Ort: Universität Magdeburg, Gebäude 04, Raum 101

Formulation and Application of a Sparse-Modes Method for Turbulence Simulation

Subgrid closure of coarse-grained simulations of turbulent flows is challenging near walls and for multi-physics applications such as reacting flows. The sparse-modes approach can avoid coarse-grained advancement while reducing cost relative to direct numerical simulation. In the formulation described here, the smallest scales of motion are resolved on three arrays of subdomains, such that each array fills the flow volume and provides full resolution in one coordinate direction. Within each sub-domain, a stochastic model termed One-Dimensional Turbulence (ODT) simulates turbulent flow advancement in the resolved direction. An additional advection process couples the sub-domains so as to capture large-scale 3D motion without requiring advancement of filtered flow properties. This formulation, termed ODTLES, has been used to simulate decaying homogeneous turbulence and various wall-bounded flows. The ability of this sparse-modes type of approach to capture 3D large-scale features while affordably resolving the wall-normal structure of near-wall flow is demonstrated.

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