Novel Spanwise Vortex Generator for Separation Control on BFS: Experiment and Simulation

  • Palma Gonzalez
  • Ning Qin
  • Xiao MingEmail author
Part of the Computational Methods in Applied Sciences book series (COMPUTMETHODS, volume 52)


This paper is on the effects of a novel span vortex generator on the periodic components of the turbulent shear layers and the Reynolds stresses. The turbulence modelling approach is 3D simulations IDDES, a hybrid RANS/LES technique. The geometry for the study is taken from the experimental configurations for the case. The case comprises a turbulent flow over a backward facing step (BFS), where separation is induced after the step edge. The results from the simulations are compared to the experimental data with and without control. Spanwise vortex generators consist of a strip of magnets placed along the span of the BFS upstream of step and the device oscillates at a given frequency of 280 Hz and amplitude of 0.002m. Turbulent structures, Reynolds stresses, skin friction distributions and velocities are analysed and compared to the experimental measurements. A remarkable effect of the device is observed especially in the reattachment length which is considerably reduced. Experimental measurements for the baseline case were available and a comparison with the available data is performed.


Span-wise vortex generator Experiment Hybrid RANS-LES Separation control BFS 


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© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringUniversity of SheffieldSheffieldUK
  2. 2.Department of AerodynamicsNanjing University of Aeronautics and AstronauticsNanjingChina

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