Application of mathematical modeling to solve the emergency water landing task in the interests of passenger aircraft certification

Abstract

The article deals with issues related to the application of modeling in the interests of aircraft certification. The technique of numerical flood modeling based on the numerical solution of Navier–Stokes equations with a free surface is proposed. Verification of the technique was carried out on the tasks about water fluctuations in the tank under the action of gravity, cylinder movement in the liquid and ball drop in the liquid. In all cases, good convergence of simulation results with experimental data is shown. Validation of the method was performed on the task of sinking the vessel model with damage in the bottom and on board. Complex model hull movements were studied due to changing buoyancy properties as a result of water leakage inside the hull during the sinking. Comparison of calculated and experimental data shows their qualitative and quantitative consistency at the initial stage of the dive. By the example of modeling the flooding of the passenger aircraft model, the practical application of the developed method for certification is shown. It was found that at the initial moment of time after an unplanned landing on the water, the front and rear emergency exits are located above the waterline, and the buoyancy time of the aircraft is sufficient for its emergency exit.