Multidisciplinary advanced computations: Fluid dynamics, Aeroacoustics, Structural dynamics 2 (MultFAS2)

Purpose and goal:

The multidisciplinary project aims to study internal weapon bays (IWB) in transonic flow and how its flexible structure affects and is affected by acoustic phenomena. Furthermore, structural vibrations and aerodynamic forces from FSI (fluid-structure interaction)/CFD (computational fluid dynamics) simulations of the cavity will be coupled with analyzes to calculate internal aircraft noise.

The goal is to create an analysis chain that connects external flow with internal noise and to formulate "best practice" for this type of analysis and methodology. Expected results and effects:

The project is expected to result in an improved ability to use calculations to predict external and internal noise associated to IWBs in transonic flow, aeroelastic structural deformations and a deeper understanding of the interaction between acoustics and structural vibrations. The expected results will, among other things, have an effect in the development of future combat aircraft systems, civil aircraft platforms and derivatives whereof multidisciplinary simulations techniques will be of great importance. The results and effects are thus of a "dual-use" nature.

Approach and implementation:

The project is a continuation of the NFFP7-MultFAS project. With FSI simulations, where the flow field is simulated using hybrid RANS-LES methodology, create a deeper understanding of the interaction between external aerodynamics/acoustics, structural dynamics and internal noise of IWBs. Continued numerical studies with refined simulation models are applied to create increased confidence in results to strengthen the scientific and industrial value - "best practice". Furthermore, experience and developed methodology are applied to an aircraft-like IWB.