Immersed Coupling of Isogeometric Analysis and Peridynamics for Blast Fluid-Structure Interaction Simulation

We present a novel formulation based on an immersed coupling of Isogeometric Analysis (IGA) and Peridynamics (PD) for the simulation of fluid–structure interaction (FSI) phenomena for air blast. We aim to develop a practical computational framework that is capable of capturing the mechanics of air blast coupled to solids and structures that undergo large, inelastic deformations with damage and fragmentation. The interaction between fluid and solid is modeled in two different ways, i.e., using strong and weak (penalty-based) coupling. It is shown that using a simple volumetric penalty technique enables effective handling of the solid fracture and fragmentation. Several numerical examples of ductile and brittle solids under blast loading scenarios, including point-charge detonation on 3D concrete slabs using an M7 Microplane constitutive material model, are provided to clearly illustrate the power and robustness of the proposed air-blast FSI framework.