Introduction

During our project, we have worked on fluid-structure interactions on two cylinders in tandem with numerical simulation. Structures in contact with fluid flow, whether natural or man-made, are subject to flow-induced forces and flow-induced vibration. Under certain conditions, the vibration may be self-excited. These instabilities cause damage in a short or the long term in nuclear power plants for example. It is why the BARESAFE project was created (it regroups EDF, AREVA and CEA) to understand these instabilities. Firms have to replace cylinders every six months due to the instabilities ; it is clearly important to understand and fix this problem. Therefore our main interest is twofold because these cylinders can be found in offshore installations or cables.

Our aim is to build a reduced model and a post-process with a big data based on an experience performed in a wind tunnel to decrease calculation times. Indeed, if calculation times are reduced, we can test more complex configurations and reach as quickly a resolution as possible.