Numerical Analysis For Fluid-structure Interaction Under Impulsive Loading

In recently, the fluid-structure interaction (FSI) problems subject to blast impaction has attracted more and more attentions. It exhibits the important practical significance both in terrorist and military aspects.This paper described the fluid-structure interaction problems subject to explosive loading. The key problem in the FSI, that is methods of the information transmission on the interface is described in detailed. Two popular methods for solving FSI problems such as strongly coupled method and weakly coupled method are comprehensive compared. A FSI program framework is built up on the basis of "weakly coupled method". The FSI numerical framework with strong dynamic impact loads is constructed on the format of the independent gas dynamics software and serials of commercial finite element programs. Numerical program for FSI problem is simulated on the basis of displacement continuous condition. The nonlinear displacement domain of solid phase is simulated by using finite element method on the Lagrange frame. The flow field is described by the time-dependent Euler equations casting in an ALE framework. The pressure domain in flow field is computed by using the cell-centered finite-volume scheme. Radial basis function is adopted and implements to transfer the data of fluid-structure coupling interface. The one-dimensional spring piston problem shows the good agreements of the solution of displacement and speed between the analytical results and numerical solutions and exhibits the good accuracy of the present numerical frame in simulating fluid-structure interaction problem.Based on the present program, by using finite element software ABAQUS as a solid solver, a concrete wall under blast load is simulated under explosion shock loading process. The grid-delete-method and virtual grid ventilation technology of ABAQUS is used to judge the destruction grid to perform the destroy grids as the ventilation state. An elastic-plastic coupling behavior of the truck under explosion shock load is also simulated.