| The numerical simulation of turbulent flow forms a subject of intensive research. In the Multiscale Modeling and Simulation group attention is given to turbulence modulation, i.e., the modification of turbulence due to external effects such as rotation, stratification, interaction with embedded particles and bubbles and direct time-dependent forcing. Turbulence modulation is studied using direct numerical simulation (DNS) and large-eddy simulation (LES). In addition, flow through complex porous media is a focal point, allowing attention for the study of heat- and mass transfer as well as the long-time stability of biological tissues, e.g., of relevance to cerebral aneurysms. The focus in this research is first on the development and thorough understanding of the numerical methods in relation to the underlying physical and mathematical properties of the governing equations. Attention is subsequently given to understanding physical/chemical/biological aspects of specific systems through extensive parameter studies. These computational modeling studies rely entirely on the availability of modern supercomputers. The turbulence problem is recognized as a key example of problems that can continuously absorb further progress in computational hardware and software. This becomes all the more relevant in case turbulent flow is modulated through additional physical mechanisms. The flow through porous media is of particular relevance to process engineering and to understand flow in atmospheric boundary layers over rough terrain. The flows involved in biomedical applications are relevant to improved planning and support of surgical interventions. |
