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Many aeronautical systems are designed in consideration of Fluid dynamics, heat transfer and mechanical phenomena. The numerical simulation is now widely involved in the design. Today, existing tools and methodologies have reached a good maturity to analyse them separately. However, the real objective is to consider the behaviour of the systems with these coupled phenomena. Very disparate methodologies have been implemented to take this into account. Today, many methodologies imply to do the CFD simulations first, extract conditioning for heat transfer and export temperature fields for mechanical modelling. For that kind of modelling, each discipline has its own mesh, allowing exchange with other disciplines by interpolation of data. Some methodologies also exist for the coupling of (CFD + heat transfer).