Numerical simulation of the aircraft flight after encountering a microburst windshear

A physical and mathematical modelling of the microburst effect on aircraft behaviour is presented in the paper. Dynamics equations of the aircraft motion are derived in a plane-fixed co-ordinate system using the Boltzmann-Hamel formalism for material systems with holonomic constraints. The aircraft is treated as a six-degree-of-freedom rigid body. For calculating of aerodynamic forces and moments the rules of quasi-stationary aerodynamics were employed. The windshear velocity field is described by the 3D mathematical Bray' model which was applied basing on the meteorological data resulting from the Joint Airport Weather Studies Project. The influence of local parameters of the microburst was introduced into the equations of flying object motion in terms of three instantaneous linear components of wind velocity and the three angular ones. Computations were made taking the PZL 1-22 ''Iryda'' as a test aircraft.