Ensuring damage-free emergency sea landing of airplanes and helicopters
The proper prediction of the stress endured by an aircraft during “ditching” (sea landing) is crucial to guarantee its resistance and ensure safety of passengers and crew. Unfortunately, due to the extreme violence and briefness of this stress and to the numerous physical phenomena involved, experimental testing is particularly complex. Subject to time and financial constraints, numerical simulation is therefore essential.
SPH-flow software is a diphasic particle-based solver. Its Lagrangian approach allows violent flows involving extensive free surface deformation to be modelled. Moreover, the use of adaptive particle refinement enables accuracy to be improved at specific locations around the fuselage. In the current context, it allows very localized pressure impacts to be captured without increasing computation costs. These essential capabilities make SPH-flow the perfect CFD solver for ditching simulation.
Furthermore, SPH-flow uses coupling modules with different solid mechanics solvers (such as EDF Code_Aster and 3DS SIMULIA Abaqus). Fluid-structure simulation opens up the possibilities of studying aircraft structure distortions.
Nextflow Software has developed considerable expertise in ditching simulation in partnership with Dassault Aviation and Airbus Helicopters. This skill has been further reinforced by strong experience gained in related studies, such as spaceship boosters falling in the sea or lifeboat and container dropping.