A numerical approach is developed for the simulation of fluid-structure interaction(FSI)problems and is applied to bubble collapse near a deformable wall,the phenomenon responsible for cavitation erosion.The present m...A numerical approach is developed for the simulation of fluid-structure interaction(FSI)problems and is applied to bubble collapse near a deformable wall,the phenomenon responsible for cavitation erosion.The present method is based on a partitioned coupling:The fluid flow is resolved in an in-house finite volume solver and structure dynamics are computed in FEniCS,an open-source finite element solver.Data communication between the two solvers and the space-time coupling of their respective solutions are handled by the coupling library preCICE.The novelty of the present strategy lies in the use of a penalization method to represent the solid body within the fluid solver,allowing the use of a fixed Cartesian grid for increased accuracy and reduced computational cost,as no remeshing is required for moving boundaries.Bubble collapse generates high-intensity shock waves that impact the surrounding wall,resulting in high equivalent stress in the material.When it exceeds the material yield strength,a cavitation pit forms.One-way and two-way coupling simulations are compared in order to demonstrate the need to consider strong coupling for this type of FSI problem.The influence of the initial bubble-wall distance on the resulting material damage is investigated.展开更多
基金supported by the Labex INTERACTIFS(Grant No.ANR-11-LABX-0017-01)the Agence Innovation Defense(AID).
文摘A numerical approach is developed for the simulation of fluid-structure interaction(FSI)problems and is applied to bubble collapse near a deformable wall,the phenomenon responsible for cavitation erosion.The present method is based on a partitioned coupling:The fluid flow is resolved in an in-house finite volume solver and structure dynamics are computed in FEniCS,an open-source finite element solver.Data communication between the two solvers and the space-time coupling of their respective solutions are handled by the coupling library preCICE.The novelty of the present strategy lies in the use of a penalization method to represent the solid body within the fluid solver,allowing the use of a fixed Cartesian grid for increased accuracy and reduced computational cost,as no remeshing is required for moving boundaries.Bubble collapse generates high-intensity shock waves that impact the surrounding wall,resulting in high equivalent stress in the material.When it exceeds the material yield strength,a cavitation pit forms.One-way and two-way coupling simulations are compared in order to demonstrate the need to consider strong coupling for this type of FSI problem.The influence of the initial bubble-wall distance on the resulting material damage is investigated.
