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active Grids

Active grids enable an incredible variety of flows in the wind tunnel. Different control strategies can be used not only to generate velocity time series such as gusts, but also to achieve specific turbulence characteristics with adjustable turbulence intensity and integral length.

Both hardware and software are provided. We supply complete and ready-to-use systems according to customer specifications.

Hardware:

  • Various sizes possible (experience with cross-sections from 0.25×0.25m² to 3x3m²)
  • Powerful servo motors with servo controllers allow fast, targeted movements of the individual shafts

 

Software:

  • Standalone, no licenses required
  • User-friendly GUI
  • Individual control of shafts with up to 100Hz
  • Repeatable flow generation through the use of user-generated protocols
  • Definition of various trigger signals (grid protocols can also be triggered)
  • Real-time display of the movement of individual shafts

Literature:

Neuhaus, L., Hölling, M., Bos, W. J., & Peinke, J. (2020). Generation of atmospheric turbulence with unprecedentedly large Reynolds number in a wind tunnel. Physical review letters, 125(15), 154503. https://doi.org/10.1103/PhysRevLett.125.154503

Neuhaus, L., Berger, F., Peinke, J., & Hölling, M. (2021). Exploring the capabilities of active grids. Experiments in Fluids, 62, 130. https://doi.org/10.1007/s00348-021-03224-5

Kröger, L., Neuhaus, L., Peinke, J., Gülker, G., & Hölling, M. (2019). Turbulence Generation by Active Grids. In: Örlü, R., Talamelli, A., Peinke, J., Oberlack, M. (eds) Progress in Turbulence VIII. iTi 2018. Springer Proceedings in Physics, vol 226. Springer, Cham. https://doi.org/10.1007/978-3-030-22196-6_30

Wester, T.T.B., Krauss, J., Neuhaus, L., Hölling, A., Gülker, G., Hölling, M., & Peinke, J. (2022). How to Design a 2D Active Grid for Dynamic Inflow Modulation. Flow, Turbulence and Combustion, 108, 955–972. https://doi.org/10.1007/s10494-021-00312-8

Mydlarski, L. (2017). A turbulent quarter century of active grids: from Makita (1991) to the present. Fluid Dynamics Research, 49, 061401. https://doi.org/10.1088/1873-7005/aa7786

Hearst, R.J. (2019). The Use of Active Grids in Experimental Facilities. In: Örlü, R., Talamelli, A., Peinke, J., Oberlack, M. (eds) Progress in Turbulence VIII. iTi 2018. Springer Proceedings in Physics, vol 226. Springer, Cham. https://doi.org/10.1007/978-3-030-22196-6_27

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