FOR 507:  Large Eddy Simulation (LES) of complex flows

• Subject Area: Thermal Engineering/Process Engineering
• Term: from 2003 to 2009
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 5470235

The common topic of this French-German Research Unit is the Large Eddy Simulation (LES) of complex turbulent flows. LES has the potential of becoming a widely used simulation tool for flows of practical relevance, not only because of its capabilities of predicting fluctuating quantities like the source term for aero-acoustic simulations, but also because of its improved accuracy compared to the numerically less expensive Reynolds-Averaged Navier-Stokes Simulations (RANS). In this sense, LES can be regarded as key-technology for new developments in computational aero-acoustics (CAA), in fluid-structure interactions, fatigue analysis, aerodynamics, process technology etc. The aim of this research is the improvement of existing and the development of novel approaches to LES which are capable of dealing with high Reynolds number flows in complex geometries in an efficient and reliable way. Some fundamental issues have to be treated in order to improve the applicability of the method for high Reynolds number flows and for flows in or around complex geometries. These issues comprise: -- wall treatment in high Reynolds number flows;-- coupling of RANS with LES;-- improvement of subgrid-scale modeling in complex situations;-- improvement of discretization schemes for complex geometries.

• DFG Programme: Research Units
• International Connection: France

Projects

• Development and analysis of implicit subgrid-scale modeling strategies within a grid-based Eulerian discretization and a grid-less Lagrangian discretization. Application and comparison of these strategies for complex turbulent flows (Applicant Adams, Nikolaus Andreas )
• Hybrid LES-RANS-Coupling and Wall Modeling for Complex Flows with Separation (Applicant Breuer, Michael )
• LES and hybrid RANS/LES of swirling flows with compression by using differential subgrid stress models (Applicant Jakirlic, Suad )
• LES-RANS coupling for the simulation of complex flows (Applicant Fröhlich, Jochen )
• Numerical simulation of turbulent flows in complex geometries using the CVS approach based on orthonormal wavelet decomposition (Applicant Bockhorn, Henning )
• Pseudo-Spectral Methods for LES of Complex Flows (Applicant Schäfer, Michael )
• Wall-layer models for large eddy simulation of complex flows (Applicant Manhart, Michael )

• Spokesperson: Professor Dr.-Ing. Michael Manhart
• Deputies: Professor Dr. Patrick Bontoux; Professor Dr.-Ing. Wolfgang Schröder