Direct numerical simulation of an impinging jet into parallel disks

A direct numerical simulation code with cylindrical geometry has been developed. A direct numerical simulation (DNS) of an impinging round jet into parallel disks is performed for a Reynolds number of 10,000 based on the nozzle exit velocity and the nozzle diameter (D). Mean flow variables, turbulent intensity, pressure distribution and turbulent kinetic energy budgets are obtained at various radial locations. The present DNS results are in fairly good agreement with the two-dimensional PTV measurements by Nishino and co-workers in 1996. Some flow features of this impinging round jet regarding a turbulent transition process are discussed.