Extended Vofire algorithm for fast transient fluid–structure dynamics with liquid–gas flows and interfaces

The present paper is dedicated to the simulation of liquid–gas flows with interfaces in the framework of fast transient fluid–structure dynamics. The two-fluid interface is modelled as a discontinuity surface in the fluid property. We use an anti-dissipative Finite-Volume discretization strategy for unstructured meshes in order to capture the position of the interface within a thin diffused volume. This allows to control the numerical diffusion of the artificial mixing between components and provide an accurate capture of complex interface motions. This scheme is an extension of the Vofire numerical solver. We propose specific developments in order to handle flows that involved high density ratio between liquid and gas. The resulting scheme capabilities are validated on basic examples and also tested against large scale fluid–structure test derived from the MARA 10 experiment. All simulations are performed using EUROPLEXUS fast transient dynamics software.