Numerical investigation of the unsteady distortion for an S-duct intake with mechanical vortex generators

Flow control devices are used within complex intakes to reduce the flow distortion which can adversely impact stability and performance of embedded engines. There is a need assess capability modern computational methods such as detached eddy based models compute unsteady flowfield evaluate potential benefits on distortion. This paper investigates for an S-duct using Zonal Detached Eddy Simulations (ZDES) with passive modelled overlapping Chimera grid method. The ability ZDES was assessed. computed at Aerodynamic Interface Plane compared experimental data total pressure velocity field measurements. For baseline configuration, model has proven be able simulate AIP, provide time averaged fluctuating levels swirl 1% 13% respectively strong AIP also captured by ZDES. overall increase ratio (PR) due predicted less than error. 65% reduction in fluctuation when 8% error S-PIV Overall it determined that method characteristics both reference configuration well case control.