Application of the Hydrodynamic Theory and the Finite Element Method in the Analysis of Bird Strike in a Flat Barrier
Marinko UgrčićIn both cases of the used methods, i.e. theories, the hydrodynamic theory and the finite element method, the bird body was modeled as a porous water-air material in the shape of a flat or hemi-spherically ended cylinder. The finite element bird modeling was carried out by the use of the Smooth Particle Hydrodynamics (SPH) method for materials of different porosity. In this way, the dependence of the sound speed and the bulk modulus on the porosity in the equation of state (EOS) was developed. A new approach to the computation of stagnation pressure in the porous material was proposed as well. On the other hand, the Lagrangian target was considered as a simple flat rigid steel or elastic Al-alloy plate. The comparative analysis of the numerical results of the bird impact for the Hugoniot shock theory and the SPH method was given. Some results of experimental data were also included. Key words: impact, mechanical impact, birds, modelling, process simulation, finite element method, hydrodynamic theory. |