Scientific activities / projects Non-empiric 3D aeroacoustic CAA method for the simulation of sound of wind turbines Mechanical Engineer (young scientist)

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For our Institute of Aerodynamics and Flow Technology in Braunschweig we are looking for a

Non-empiric 3D aeroacoustic CAA method for the simulation of sound of wind turbines

Your mission:

In the framework of a shared sponsorship with a large German wind turbine manufacturer, research is planned on the efficient 3D numerical prediction of aerodynamic wind turbine noise. The use of wind turbines represents a significant part of the conversion to renewable energy. However, wind turbines produce aerodynamic noise, which in view of residents is to be kept as low as possible. By use of local 3D modifications at wind turbine blades (e.g. serrations at the trailing edge) appreciable reduction of the radiated noise may be achieved. A targeted approach for the development of such measures could be significantly supported by aeroacoustic simulations. The position aims at developing a non-empiric 3D aeroacoustic CAA(=ComputationalAeroAcoustics) method for the simulation of sound of wind turbines.

In particular:

• familiarization with the use and structure of DLR’s CAA Codes PIANO and DISCO++ and the stochastic turbulence model FRPM (Fast Random Particle Mesh) for the simulation of turbulence related sound
• conversion of an existing 2D prediction methodology for wind turbine airfoils on 3D DISCO++, analysis of Benchmark test cases and comparative assessment of results
• development of an efficient 3D analysis concept on the basis of DISCO++ for the simulation of wind turbine rotor sections in 3D to include aerodynamic and aeroacoustic effects of add-on devices on the example of trailing edge serrations
• development of a 3D meshing concept (CAA + FRPM) for efficient simulation for trailing edge serrations
• execution of simulations at chosen test case
• comparison of simulated sound pressures for source data from scale resolving simulations (LES – provided by sponsoring company) and stochastic model for chosen test case
• parameterisation of a trailing edge serration geometry and conduct of a design study on the aeroacoustic effect of different serrations
• conduct of a validation experiment on best design outcome and comparison to unmodified configuration
• comparison between prediction and measurement, assessment of accuracy and efficiency of simulation
• transfer of results onto other add-on devices
• documentation and publication of results

Your qualifications:

• scientific MSc. in aeronautics or mechanical engineering
• knowledge on aeroacoustics and/or aerodynamics and respective numerical methods
• professional experience as computation engineer aeroacoustics is an asset
• PhD in aerodynamics/aeroacoustics is of advantage
• programming skills (Fortran, C, C++, Python) in technical/scientific context, CAD experience
• use of LINUX and WINDOWS based computer architectures
• good proficiency of written and spoken English
• good proficiency of written and spoken German is a plus

Your benefits:

Look forward to a fulfilling job with an employer who appreciates your commitment and supports your personal and professional development. Our unique infrastructure offers you a working environment in which you have unparalled scope to develop your creative ideas and accomplish your professional objectives. Our human resources policy puts great value on a healthy work-life balance as well as equal opportunities for men and women. Individuals with disabilities will be given preferential consideration in the event their qualifications are equivalent to those of other candidates.

If you have any questions concerning specific aspects of the job, please contact Jan Werner Delfs by calling +49 531 295-2170. Please find further information on this vacancy with the reference number 28292, and details regarding the application procedure, at www.DLR.de/dlr/jobs/#30739.