Numerical simulation of twin‐jet impingement on a flat plate coupled with cross‐flow

Abstract

Abstract Theoretical research to simulate twin‐jet impingement with cross‐flow has been undertaken. An impinging twin jet coupled with cross‐flow in closed ground effect has been studied by using the compressible Navier‐Stokes equation with a Jones–Launder κ–ϵ two‐equation turbulence model. The velocity results without cross‐flow were compared with the data of Saripalli et al . and found to show good agreement. The calculated results show that several recirculating zones are distributed around the flow field. Their size and location are closely related to the jet exit height above the ground, the nozzle space and the strength of cross‐flow. In addition, a fountain upwash flow occurs between the nozzles, and two low‐pressure recirculating zones are induced by the interaction between the nozzle mainstream and the fountain upwash flow. This induce a loss of lift force of the aircraft. The effects of the cross‐flow induce the sudden decrease in the lift force of the aircraft; the stronger the cross‐flow, the lower is the lift force of the flow field.