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A fluid-structure-interaction tool by coupling of existing codes

Fluid-Structure-Interaction (FSI), as a sub-discipline of computational mechanics, has been gaining relevance since the growth in clusters capacity has made it possible to simulate high resolution models. Although some commercial tools already present certain capabilities for coupled simulations, the lack of efficiency of these general purpose programs is still an issue. Moreover, the high cost of commercial licenses - on a per processor basis - hampers the computation of high resolution models for academic research. Instead, a coupled software solution that resorts to well established existent programs proves a good alternative to preserve the value of decades-long development and associated know-how. However, since such codes were mostly conceived for standalone run, an elegant software implementation is not easily achieved.
 In this work our CFD code SPARC has been coupled with the open-source structural solver CalculiX by means of the in-house developed software packet FSiM. FSiM stands for Fluid-Structure-Interaction Simulation Manager and is in charge of the communication between the fluid and structure solver using the Dynamic Process Management of the MPI-2 standard. This approach facilitates that the parallelization strategies of both part-solvers be used with minimal modifications and no risk of mutual interference. Results of a simple two-dimensional test case of the panel flutter problem are presented to show the capabilities of the new coupling tool.