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This work presents a new backward facing step flow experiment performed within the DLR project ADaMant for the validation and improvement of RANS turbulence models. A new version of 2D Lagrangian particle tracking is used to obtain a highly resolved flow field of the separated shear layer, the recirculation bubble and flow reattachment. The spreading of the separated shear layer and the Reynolds stress anisotropy, are analysed. Both are found to be higher than for attached turbulent boundary layers. Finally, some implications for RANS turbulence modeling are given.

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Experimental Data Analysis of Mean Flow and Turbulence over a Backward Facing Step for RANS Turbulence Modeling

  • 会议论文

  • 发表日期：

    2026年

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  • Maïté Guerin,
  • Tobias Knopp,
  • Cornelia Grabe,
  • Marco Costantini,
  • Andreas Schröder,
  • Daniel Schanz,
  • Reinhard Geisler

摘要

This work presents a new backward facing step flow experiment performed within the DLR project ADaMant for the validation and improvement of RANS turbulence models. A new version of 2D Lagrangian particle tracking is used to obtain a highly resolved flow field of the separated shear layer, the recirculation bubble and flow reattachment. The spreading of the separated shear layer and the Reynolds stress anisotropy, are analysed. Both are found to be higher than for attached turbulent boundary layers. Finally, some implications for RANS turbulence modeling are given.