Forschung im HLRN-Verbund 2011

107Figure 1: Snapshots of turbulent vortices resolved in two simulations: Tandem cylinders as a benchmark model forairframe noise (left) and a simplified landing gear model (right).eration cannot be simulated using standard statisticalturbulence models. Methods such as DES,which enable the resolution of as many turbulenteddies as is affordable are therefore ideally suitedfor efficient aero-acoustic simulations. This formsa particular emphasis of the TU Berlin work, withthe aim of providing engineers with a useful aeroacousticprediction tool to ultimately reduce suchnoise in future designs. Two flow configurationsthat are particularly interesting for airframe noisesimulation are shown in the figure: The tandemcylinders are considered a benchmark test casefor airframe noise as well as providing a very challengingflow in its own right. The simplified landinggear is the focus of international efforts to compareand improve computational aero-acoustic simulationmethods.These activities therefore contribute to the improvementand industrialisation of efficient methodsfor turbulence simulation, which can be appliedby the air transport industry in the design ofgreener and quieter aircraft of the future.More Information1. The ATAAC Project Website:http://cfd.mace.manchester.ac.uk/ATAAC/2. P. Spalart, W. Jou, M. Strelets, and S. Allmaras.Comments on the feasibility of LES for wings,and on a hybrid RANS/LES approach. Advancesin DNS/LES, 1, 1997.3. P. Spalart. Detached-eddy simulation. AnnualReview of Fluid Mechanics, 41:181-202, 2009.4. C. Mockett. A comprehensive study ofdetached-eddy simulation. Dissertation, TUBerlin, 2009.FundingEuropean Union FP7, Project ATAAC, Research &InnovationIngenieurwissenschaften