A Lagrangian fully explicit approach for the co-simulation of three-dimensional problems of Fluid-Structure Interaction (FSI) is here presented. The fluid domain is modelled as a weakly compressible material through an explicit version of the Particle Finite Element Method (PFEM). The structure is modelled with standard FEM through the commercial software Abaqus/Explicit. The strong coupling of the partitioned approach is ensured by the Gravouil and Combescure (GC) algorithm. The GC scheme allows for the use of incompatible space-time discretizations in the two subdomains. The coupling problem leads to a small explicit system of decoupled equations when conforming meshes are used at the interface, while, in the case of non-conforming meshes, a weakly coupled system is obtained. A novel and efficient mesh smoothing procedure is proposed to remove bad quality tetrahedra that may arise in the frequent remeshing framework of the PFEM, since they can lead to an overly small stable time step size. The fully Lagrangian description of the present method is particularly effective in problems characterized by strong variations in the fluid boundaries. Moreover, the highly parallelizable and fully explicit nature of the equations of the global solver is appealing for real-scale engineering applications with fast dynamics and/or a high degree of non-linearity.

An explicit Lagrangian approach for 3D simulation of fluid-structure-interaction problems

S. Meduri;M. Cremonesi;U. Perego
2018-01-01

Abstract

A Lagrangian fully explicit approach for the co-simulation of three-dimensional problems of Fluid-Structure Interaction (FSI) is here presented. The fluid domain is modelled as a weakly compressible material through an explicit version of the Particle Finite Element Method (PFEM). The structure is modelled with standard FEM through the commercial software Abaqus/Explicit. The strong coupling of the partitioned approach is ensured by the Gravouil and Combescure (GC) algorithm. The GC scheme allows for the use of incompatible space-time discretizations in the two subdomains. The coupling problem leads to a small explicit system of decoupled equations when conforming meshes are used at the interface, while, in the case of non-conforming meshes, a weakly coupled system is obtained. A novel and efficient mesh smoothing procedure is proposed to remove bad quality tetrahedra that may arise in the frequent remeshing framework of the PFEM, since they can lead to an overly small stable time step size. The fully Lagrangian description of the present method is particularly effective in problems characterized by strong variations in the fluid boundaries. Moreover, the highly parallelizable and fully explicit nature of the equations of the global solver is appealing for real-scale engineering applications with fast dynamics and/or a high degree of non-linearity.
2018
Proceedings of the 6th. European Conference on Computational Mechanics (Solids, Structures and Coupled Problems) and 7th. European Conference on Computational Fluid Dynamics
978-84-947311-6-7
FSI, PFEM-FEM Coupling, Explicit Solver, Lagrangian Formulation
File in questo prodotto:
File Dimensione Formato  
Meduri_Cremonesi_Perego_2018-ECCM-VI-ECFD-VII.pdf

Accesso riservato

: Publisher’s version
Dimensione 494.22 kB
Formato Adobe PDF
494.22 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1072658
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact