Validation of a new fluid—structure interaction framework for non-linear instabilities of 3D aerodynamic configurations

Abstract

A new framework developed at CIRA to deal with Fluid–Structure Interaction phenomena in a partitioned approach has been developed. A multi-block structured flow solver for unsteady Navier–Stokes equations, UZEN, was updated and tightly coupled with the open-source FEM code CalculiX in a modular approach.The solvers are interfaced through the open source library preCICE (Bungartz, 2016), that takes care of exchanging data, synchronization and controls the executing processes by means of specific adapters.The framework was designed with the capability to simulate large variety of configurations with complex motions, including rotorcrafts; it has growth potential to include multi-body dynamics and possibly other tools for multi-disciplinary analyses.The present work is focused on numerical validation, by demonstrating the solution of external aerodynamics problems in Euler and viscous flows. In details, instabilities in subsonic and supersonic Euler flows of 2D and 3D panels are verified, comparing the results in terms of static divergence and Limit Cycle Oscillation amplitude with literature works. Furthermore, the AGARD 445.6 wing flutter behavior is investigated in transonic turbulent flow.