Author(s): Cumhur Ozbey; Serhat Kucukali
Linked Author(s): Serhat Kucukali
Keywords: Drag coefficient; Form drag; Fine screen; Numerical modeling; Large Eddy Simulation
Abstract: Numerical simulations were performed to determine the drag coefficients of the Oppermann and rectangular fine screens. Both bar profiles were positioned perpendicularly to the approach flow direction. The upstream flow depth was taken as 0.2 m and the bar thickness was s = 0.006 m for both screens. The Large Eddy Simulation (LES) was employed with a grid size of 0.001 m. Three different bar spacing of 4,6, and 10 mm were tested under four different approach velocities corresponding to a bar Reynolds number range of 600 – 1500. A strong correlation was revealed between the drag coefficient and the bar shape. Also, regardless of the bar spacing, the drag coefficients were shown to decrease with increasing Reynolds number. Likewise, for both bar geometries, higher drag coefficients were obtained for narrower spacing between the bars. Accordingly, the average drag coefficients for the Oppermann and rectangular bar profiles were found as 1.50 and 3.73, respectively.
Year: 2024