Turbulence modelling via the RANS approach remains the weakest link in terms of reliability and in any case provides too little information in areas such as thermal stripping, aéroacoutics and turbulent flow induced vibrations, which require a refined spectral representation of the flow. LES provides detailed and accurate predictions of turbulent phenomena and is today’s mainstream research focus in the turbulent CFD area. High performance computing (clusters of hundreds and even thousands of processors) make this approach feasible, for intermediate Reynolds numbers. For higher and industrial Reynolds numbers, or near-wall flows where wall turbulence plays a major role, new routes must be explored. Coupled code simulations on multiple overlapping grids (overset composite grids or CHIMERA) that are now appearing in aeronautics and supercomputing can also lead to a technological breakthrough in LES, acoustics and fluid-structure coupling. This project aims at exploiting these multi-mesh and multi-model developments, first in an unstructured finite volume CFD code for refined predictions of near wall turbulent flows at Reynolds numbers of the order of millions, also extending the coupling to a high order discretisation acoustics code in direct numerical simulation mode for flow over blades. The method will be extended to fluid structure coupling of vibrating structures thanks to mobile overset grids. The findings from this project will be widely disseminated in publications or within the EDF CFD software Code_Saturne available as open source.

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Topic revision: r1 - 2008-07-04 - 15:57:35 - DominiqueLaurence
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25 Mar 2019


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