Conservative treatment of 3D multi-block unstructured mesh interfaces for finite volumes computations of fluid flows with moving boundaries

Computations of unsteady fluid flows with moving boundaries must be made on moving grids. Mesh
deformation techniques, often based on elasticity models, have been designed to adapt the mesh to a new computation domain geometry at each time step. Nevertheless, for large movements of boundaries or immersed bodies, these techniques will be unable to maintain a sufficiently good mesh quality. To avoid a necessary remeshing step, one solution is to use a multi-block mesh, composed of a number of meshes that can be independently deformed, instead of one single block mesh.