Chimera technique for transporting disturbances
| Autor: | Silvia Reuß, Dieter Schwamborn, Christoph Wolf, Tobias Knopp, Axel Raichle |
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| Rok vydání: | 2012 |
| Předmět: |
Airfoil
Engineering business.industry Applied Mathematics Mechanical Engineering Computational Mechanics Stall (fluid mechanics) Aerodynamics Dissipation Grid Computer Science Applications Vortex Physics::Fluid Dynamics Mechanics of Materials Temporal resolution Vector field Aerospace engineering business |
| Zdroj: | International Journal for Numerical Methods in Fluids. 70:1558-1572 |
| ISSN: | 0271-2091 |
| DOI: | 10.1002/fld.3642 |
| Popis: | The Chimera technique for moving grids is used to take into account non-homogeneous unsteady onflow conditions in the simulation of aerodynamic flows. The method is applied to simulate the transport of a large-scale vortex by a mean velocity field over a large distance, where it finally interacts with an airfoil. The Chimera approach allows to resolve the vortex on a fine grid, whereas the unstructured background grid covering most of the computational domain can be much coarser. This method shows the same low numerical dissipation as a simulation on a globally fine grid. Several precursor tests are performed with a finite modified analytical Lamb-Oseen type vortex, to study the influence of spatial and temporal resolution and the employed numerical scheme. Then the interaction of an analytical vortex with a NACA0012 airfoil and with an ONERA-A airfoil near stall is studied. Finally a realistic vortex is generated by a ramping airfoil and is transported on a moving Chimera block and then interacts with a two-element airfoil, which allows to simulate a typical setup for a gust generator in aerodynamic facilities. |
| Databáze: | OpenAIRE |
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