Nonstationary breakaway flow over a permeable parachute

The properties of a uniformly permeable surface that models the canopy of a real parachute are presented. A modernization of the discrete vortex method is proposed that makes it possible to apply it to calculate the flow over uniformly permeable surfaces. The results of computations of the aerodynamic characteristics of permeable parachutes are presented and compared with experimental data.Translated fromDinamichekie Sistemy, No. 6, pp.3–10, 1987.