| The interaction of fluid flow and heat transfer with flexible solid structures frequently results in deformation of structures in aero-engine. Structural deformation has significant influence on characteristics of fluid flow and heat transfer, for example in the labyrinth seal. A fluid-thermal-structure coupled analysis technique needs to be developed for advanced engine design.Presently, fluid flow and heat transfer is mainly analyzed using finite volume method (FVM) and structural deformation is often solved by finite element method (FEM). A partitioned scheme is used for fluid-thermal-structure coupled analysis, meaning that an existing flow and structure solver can be used, each solving efficiently their own equations on a separate domain and coupling is obtained through boundary conditions. However, the method often lacks efficiency, a large amount of data needs to be transferred between different solver tools. So a multi-field coupled analysis technique only based on FEM is developed for fluid-thermal-structure interaction in this paper.FEM for structures is well developed. So FEM for CFD is focused in this paper. The evolution of FEM in CFD, especially of Characteristic-Based Split (CBS) scheme, is reviewed. The expressions of CBS are formulated. Then, research on application of CBS to computational fluid dynamics is done. The viscous incompressible fluid laminar flow and heat transfer, the turbulent flow, the laminar flow inside a tube and the laminar flow and heat transfer inside a rotating disc cavity are studied by home-code of CBSftem, CBSturb,CBSaxial and CBSswirl. The program of CBSFST for fluid-thermal-structure interactions is developed, employing the code developed above and a structural analysis code. Then, several fluid-thermal-structure interaction problems are studied by the CBSFST.This work is still in its infancy, a general numerical simulations procedure and code for fluid-thermal-structure analysis needs to be developed. |
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