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.

CIRA开发了一个新的框架，该框架以分区方式处理流固耦合现象。更新了用于不稳定Navier–Stokes方程的多块结构流求解器UZEN，并以模块化方式将其与开源FEM代码CalculiX紧密结合。

求解器通过开源库preCICE（Bungartz，2016）进行接口，该库负责交换数据，同步并通过特定的适配器控制执行过程。

该框架的设计能够模拟各种复杂动作的复杂配置，包括旋翼飞机；它具有增长潜力，可以包括多体动力学以及可能用于多学科分析的其他工具。

通过展示欧拉和粘性流中外部空气动力学问题的解决方案，当前的工作集中在数值验证上。详细地，验证了2D和3D面板的亚音速和超音速Euler流的不稳定性，并与文献著作比较了静态散度和极限循环振荡幅度方面的结果。此外，在跨音速湍流中研究了AGARD 445.6机翼的颤振特性。