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Caroline Danowski, Markus Gitterle and Volker Gravemeier 

Our research effort on thermo-fluid-structure interaction (TFSI) includes, among other things, the application to rocket nozzles due to hot gases. Currently, we are developing a computational approach to thermo-structure interaction (TSI), which is a volume-coupled problem of the structural deformations and the temperature field. The resulting TSI system is a fully-coupled problem, that is, the solution of the temperature field depends on the displacement field and vice versa. The coupling of the two fields in TSI is highly influenced by the respective material. On the one hand, the material is able to display stress changes due to temperature changes (dilatation). On the other hand, temperature variations are caused by mechanical heating (Gough-Joule effect) or dissipation. 

Two main solution techniques for such coupled problems may be distinguished, partitioned and monolithic. So far, partitioned algorithms have been used predominantly in literature to solve fully coupled thermomechanical systems. We have recently developed a novel monolithic approach for TSI. To enable an efficient and robust solution of large TSI systems, iterative solvers are used in combination with block preconditioners such as Block-Gauss-Seidel and algebraic multigrid block preconditioners.

Recent extensions of our computational method for TSI are:

• the incorporation of thermo-mechanical contact, 
• the coupling to variable-density flow towards TFSI.

Publications

Please find publications on this topic here.