Modelling fluid structure interaction using one-way coupling and proper orthogonal decomposition (POD)

Abstract

Fluid structure interaction (FSI) problems are becoming highly complex as FSI has vast applications, which help to model many real life problems. Here, a oneway coupling strategy has been proposed for the FSI problem, where fluid has been modelled in computational fluid dynamics (CFD) and its interface with the solid structure has been modelled with a no-slip no-penetration boundary condition. Using Abaqus CFD simulations, the calculated interface pressure has been applied on the POD modes of the solid structure domain to obtain the displacement field. Here, we assumed that the motion of the flexible solid structure has no effects on the fluid flow as it is a one-way coupling. This assumption is well governed for the less flexible structure. However, it has been noted that this shows good predictions for flexible structures too. The benefit of this approach is that for the same interface boundary of the FSI domain, we can change the structural material properties and predict the results without going for the complete FSI simulation problem. Here, we solved a case study problem example for the fluid flow over a flexible beam and results are validated using the Abaqus FSI Cosimulation.