In this talk, we will show an immersed framework that non-intrusively couples continuum fluid solver and particle-based structure dynamics solver to simulate shock-induced blast. Most of the existing simulators focus either on shocks and shock wave propagations or on structural damage and failure. The coupled fluid-structure response requires the integration of both physics. 

Here, we propose to adopt an “immersed” framework that couples a shock fluid solver (Eulerian) with a RKPM structural dynamics solver (Lagrangian) to simulate a coupled shock-induced blast on structure failure. The formulation is based on the balance of virtual work of the entire system, which consists of work done by the background fluid and the solid that “floats” on top of it. The balance of work requires the removal of the overlapping fictitious fluid, thus allowing it to be de-coupled into the fluid domain and the solid domain. Once decoupled, each domain can be described with its own independent governing equation. Such a rigorous approach also allows a variety of coupling combinations, e.g. Eulerian-Eulerian coupling, Eulerian-Lagrangian coupling, Lagrangian-Lagrangian coupling. To couple the two domains, fluid and solid boundary quantities are interchanged, specifically fluid velocity and solid boundary tractions. The interface conditions are derived naturally based on the work balance rather than from a discrete point-to-point interpolation as in the original Immersed boundary method. The immersed framework allows the co-existence of independent meshes/particles for the fluid and the structure without the expensive or prohibitive cost of re-meshing. 

The reproduced kernel particle method (RKPM) is a particle method that does not rely on connectivities throughout the dynamic motion. RKPM allows realistic representation of structural damage that involve large deformation and bombardment of fragments. In this talk, we will demonstrate 2 numerical examples where a weak shock wave is applied in a fluid domain and the immersed solid structure is largely deformed as a result of the shock. The sharp jumps in the pressure, particularly induced by the existence of the solid, are captured. 

A RKPM solid solver is successfully adapted and integrated into the OpenIFEM open-source coupling framework. A variable mapping module is developed to interface solvers with natively different data structure. The key interfacial variables are mapped into a generic finite element data structure for applying interface conditions and node/element information. The construction of such a mapping module provides a non-intrusive means of coupling multiple solvers. 

This work shows that such an immersed particle framework yields efficient and accurate prediction of shock-induced structural damage during extreme events. Such framework also allows multiphase simulations dealing with fluid-fluid coupling and phase changes that arise with temperature variations. 


Shock-Induced Structural Failure in Extreme Events Using Immersed Particles Dynamics

Division / Sponsors: 
Aerospace, Bioengineering, Applied Mechanics, Design Engineering Division, Advanced Energy Systems, Manufacturing Engineering Division, Noise Control and Acoustics, Nondestructive Evaluation, Diagnosis, and Prognosis (NDPD), Nuclear Engineering Division, Process Industries Division, Fluids Engineering, Heat Transfer, Materials, Microelectromechanical Systems, Safety Engineering and Risk Analysis, Computers & Information in Engineering


Paper Proceedings: https://asmedigitalcollection.asme.org/IMECE/IMECE2020/volume/84478

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