Large-eddy simulations of the flow over a semi-circular cylinder at Re = 50000

Large-eddy simulations of the flow past a bluff-body with active flow control based on trapped vortex cells at Re = 50000

“…The interconnection system between vortex cells and the axially directed channel was obtained after several optimization iterations. The physics and topology of the flow over a BB without trapped vortex cells is qualitatively similar to the flow over a semi-circular cylinder with the span length of 10 × D, which was discussed in detail in our previous study [12]. Separation of the laminar boundary layers in the subcritical flow regime (Re = 50000) provides complex, nonlinear interactions between near and far wakes characterized by the flow instabilities.…”

“…The semi-circular cylinder has drawn attention of researchers due to its low negative lift coefficient (C l ≈ −1) at zero angle attack, both from an experimental and a computational point of view [13], [14], [15], [16], [17], [12]. Recently, it was shown [15] that the aerodynamic parameters of this profile can be improved by implementing several trapped vortex cells with slot suction and fluid exhaust into the near-wake flow.…”

“…The present work utilizes the basic ideas and results by Isaev et al [15] and extends them to three-dimensional space. Additionally, we leverage our previous results obtained for the flow past a semi-circular cylinder with the different span lengths [12]. Based on the diameter of the semi-circular cylinder and the free-stream velocity, the Reynolds number was set as Re = 50000.…”

“…Numerical calculations are performed for a diameter-based Reynolds number of 50000, Mach number of 0.03 and zero angle of attack. On one hand, this set of parameters (which might not be typical for large-scale vehicles) was chosen to be consistent with our previous studies [12], where the flow around a semi-circular cylinder (hereafter HC) at the Reynolds number Re = 50000 was numerically investigated and will be used as a basis or as a starting point for the further AFC development. On the other hand, it is interesting to compare the present results with experimental and numerical data available for the semi-circular cylinder at Re = 50000 of different span-wise lengths.…”

Investigating the Turbulent Flow around Semi-Circular Cylinder

“…A review of some previous works related to flow around a cylinder and semi-circular cylinder is provided. Lysenko et al, [1] numerically investigated the turbulent flow over a semi-circular cylinder utilizing large eddy model, to achieve the simulation, OpenFOAM CFD is used to perform this purpose. In this numerical investigation a Re equal to 50000 based on the diameter and zero impact angle is adopted.…”