Fluid-structure interaction of thin flexible bodies in multi-material multi-phase systems

A numerical approach for the modeling and simulation of fluid-structure interaction (FSI) in multi-material and multi-phase systems with potential phase-changes dynamics is presented. The boundary conditions at the interface between the fluids and structures are enforced using an immersed boundary technique to couple the Eulerian multi-material solver to the Lagrangian structural solver and maintain the solution algorithm's efficiency. The phase-change dynamics are modeled to consider the volume expansion/shrinkage due to the density difference in materials. The algorithm for material phase-change includes a sub-grid model near triple points and benefits from the volume-conservative continuous moment-of-fluid (CMOF) reconstruction method for smooth material domain representation. A systematic stability criterion for the coupled problems with the proposed FSI technique is derived, and the accuracy of the method is verified and tested with multiple canonical problems. The technique is employed to explore the effects of the active vortex generation of a flapping plate on the momentum and thermal dynamics of the nucleate pool boiling phenomenon in a cross-flow in two and three-dimensional setups. (C) 2020 Elsevier Inc. All rights reserved.