Development and assessment of an Immersed Boundary Method in an unstructured flow solver for steady and scale-resolving simulations

Abstract

This paper presents the implementation and assessment of an Immersed Boundary Method (IBM) in the CFD software by ONERA, DLR, Airbus (CODA). The main advantage of this approach is the fully automatic generation of hexahedral, non-body-fitted meshes, which overcomes an often-encountered bottleneck in industrial CFD and is therefore sometimes called Rapid-CFD. While most implementations of this approach rely on dedicated Cartesian solvers or on the Lattice-Boltzmann method, we extend an unstructured compressible flow solver by IBM capabilities, enabling a wide range of both steady (RANS) and unsteady (e.g. scale-resolving) applications.