Numerical Study on Asteroid Deflection by Penetrating Explosion Based on Single-Material ALE Method and FE-SPH Adaptive Method

An asteroid impact can potentially destroy life on this planet. Therefore, asteroids should be prevented from impacting the Earth to impede severe disasters. Nuclear explosions are currently only option prevent an incoming when is large or warning time short. However, exist in absolute vacuum, where explosion energy propagation mechanism differs that air environment. It difficult describe process using standard numerical simulation methods. In study, we used single-material arbitrary Lagrangian–Eulerian (ALE) method and finite element-smoothed particle hydrodynamics (FE-SPH) adaptive simulate of deflecting hazardous penetrating explosions. The ALE demonstrate expansion products coupling vacuum. FE-SPH transform failed elements into SPH particles during simulation, avoiding system mass loss, element distortion. We analyzed shock initiation damage obtained effective evolution, stress propagation, fragment distribution asteroid. addition, decoupled two processes: kinetic static at crater. corresponding modes, velocity changes, fragmentation degrees were simulated compared. Finally, high efficiency nuclear was confirmed by comparing contribution rates scheme.