Formation of tip-vortices on triangular prismatic-shaped cliffs. Part 2: A computational fluid dynamics study

The flow over triangular-shaped cliffs is studied through Computational Fluid Dynamics simulations, using the RANS approach closed with the SST turbulence model. The formation of tip-vortices on the sides of the cliff is studied, taking into account the influence of the cliff geometry and the incoming wind. CFD results are compared with experimental data on 2D planes located above the cliff. Good agreement between the two is obtained once small experimental deviations from the nominal cliff geometry are accounted for in the simulations. In addition, 3D results, such as visualization of the vortices, allow a better understanding of the complex flow over such geometry to be achieved. ► We present CFD results for the flow past triangular cliffs. ► We compare the results with stereo PIV data for the same conditions. ► CFD allowed detection and quantification of uncertainties in the experimental setup. ► CFD confirms that two delta wing vortices are created on each side of the cliff. ► Vortices are strong and quite sensitive to small changes in wind direction.