Simulation of the flow-acoustic-structural interaction in flow ducts using a partitioned approach in the time domain

Summary

Duct systems confining a subsonic air flow, such as ventilation ducts, often have a lightweight design. These lightweight constructions are easily excited by unsteady pressure fluctuations in the flow, causing structural vibrations and noise emissions. Designing effective solutions for this flow-acousticstructural problem requires a better understanding of the multi-physical interactions and efficient prediction tools. In this work, due to the confined configuration, the vibro-acoustic interaction is a strong two-way interaction and is modeled by coupling a flow-acoustic solver with a structural solver. The kinematic and dynamic continuity at the interface is ensured in this partitioned approach by a data exchange during runtime between the solvers. The data exchange is managed by the open-source coupling library preCICE [1]. The analysis of the flow-acoustic-structural interaction in a flexible flow duct with rectangular cross section was given in [2]. In this paper, the error resulting from the pressure mapping between both solvers is analyzed and an improved force mapping strategy is adopted.

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