Discrete Vortex Simulation of Shear Flow Around a Baffle Plate

Discrete vortex method was employed for simulating a turbulent shear flow around a baffle plate, which was mounted on the downstream edge of a splitter plate. Two air streams were supplied from both sides of the splitter plate, and a mixing region was formed downstream of the baffle plate. Velocity ratio of two air streams was varied from 0.20 to 1.20, and the Reynolds number based on the plate height from 2390 to 9550. Present calculations suggest following results. 1) Separated flow around a baffle plate is well simulated by the discrete vortex method. The present calculated relationship between the Strouhal number and the velocity ratio is in qualitatively good agreement with the measured one. 2) Although the Strouhal number is insensitive to the velocity ratio between 0.5 and 1.2, the vortex structure significantly changes. 3) The baffle plate possesses a capability to decrease the initial frequency of velocity fluctuation, and movements of small particles produced by the vortex cluster appear in the near wake field of the baffle plate.