SSD - Peric Seminar
Prof. Djordje Peric, Ph.D. - On Computational Strategies for Fluid-Structure Interaction: Concepts, Algorithms and Applications
College of Engineering, Swansea University, United Kingdom
This talk is concerned with algorithmic developments underpinning computational modelling of the interaction of incompressible fluid flow with rigid bodies and flexible structures.
Fluid-structure interaction (FSI) represents a complex multiphysics problem, characterised by a coupling between the fluid and solid domains along moving and often highly deformable interfaces. Spatial and temporal discretisations of the FSI problem result in a coupled set of nonlinear algebraic equations, which is solved by a variety of different computational strategies. The talk discusses different options available to the developers, ranging from weakly coupled partitioned schemes to strongly coupled monolithic solvers. Simple model problems are employed to illustrate the algorithmic properties of different methodologies, including a detailed convergence and accuracy analysis.
FSI problems often experience topological changes, typically associated with evolving contact conditions between solid components. In such circumstances, a careful assessment of the discretisation strategy is required in order to accurately and efficiently accommodate evolving topology of computational domain. In this context different strategies are discussed focussing on recently developed embedded interface methods and finite element formulations. The methodology relies on Cartesian b-spline grid discretization allowing for straightforward h- and p-refinement and employs Nitsche’s method to impose interface and boundary conditions. In order to ensure stability for a wide range of flow conditions a stabilized finite element formulation is employed.
Numerical examples are presented throughout the talk in order to illustrate the scope and benefits of the developed strategies. The examples are characterised by complex interaction between both external and internal flows with rigid bodies and flexible structures relevant for different areas of engineering including civil, mechanical and bio-engineering.