A FULLY EXPLICIT FLUID-STRUCTURE INTERACTION APPROACH BASED ON PFEM AND FEM

Partitioned approaches for the solution of Fluid-Structure Interaction (FSI) problems are particularly interesting because, among other aspects, they allow for the reuse of existing software. In this work, we propose a partitioned scheme based on the weakly compressible PFEM for the fluid domain and SIMULIA Abaqus/Explicit for the solid domain. The coupling is treated with a domain decomposition approach based on the Gravouil-Combescure algorithm. This approach allows for the use of different time step size on the two phases (fluid and solid) and incompatible mesh at the interfaces. The main goal of the proposed fomrulation is to show the possibility of a strong fluid-structure interaction coupling within of fully explicit sframework. 2D test-cases will be presented to validate the proposed coupling technique. The explicit time integration scheme for both the fluid and solid subdomains, together with the explicit treatment of the coupling, makes this method appealing for large scale applications in a variety of engineering problems with fast dynamics and/or a high degree of non-linearity.