CFD-CAA Coupled Calculations of a Tandem Cylinder Configuration to Assess Facility Installation Effects

An advanced hybrid method for the acoustic prediction

“…aerodynamic noise). On the same way, all the related outcomes were extensively documented through previous publications, either as journal articles or proceedings of international conferences [22][23][24][25][26][27][28][29][30][31]. The reason for summarizing these various works and associated outcomes here was that, although focusing each on a particular aspect (and deserving each an entire publication in itself), they all targeted the same common objective, which is the development of the advanced CAA-based hybrid approach that the present article is about.…”

“…Thanks to the various methodological outcomes they led to, these studies made it possible to develop an advanced CAA-based hybrid approach, which integrates and connects altogether the diverse aspects of the problem, whilst accounting for their interactions. Such approach was validated through an application to various acoustic problems of increasing complexity [23,24,31] (some of which are presented hereafter).…”

“…With the view of allowing the proper transfer of any given acoustic signal coming from an a priori sound generation stage to within a CAA-based propagation one, an innovative weak coupling approach was recently derived by the present first author [22][23][24]. Such approach relies on the idea of letting the sound generation stage (e.g.…”

“…Within this framework, several dedicated studies were achieved, which all served the same purpose, whilst focusing each on a particular aspect of the problem; besides previous works that led to the development of an optimal CAA method/solver [17,18], a specific research action [22][23][24] consisted in developing a weak coupling approach that could allow a CAA-based propagation stage to be forced with any given acoustic signal whilst offering to handle acoustic backscattering phenomena, for the overall hybrid method is compatible with many situations of interest (cf. the anechoicity requirement evocated above).…”

“…This weak coupling approach relies on the so-called Non Reflective Interface (NRI) technique [22][23][24], which constitutes an improved version of the original (reflective) interfacing technique that had been initially developed by the present first author a decade ago [17,18]. The latter technique consisted in forcing explicitly the CAA computed field with the acoustic signal to be transferred, such explicit forcing being applied at each time step and over a few rows of ghost cells (see details in Refs.…”