Validation of a 3D contact algorithm for the study of blade-tip/casing contacts in turbomachines

Abstract : The optimization of modern turbomachines through the diminution of aerodynamic losses leads to more frequent contacts between the fixed and rotating components. Modal interaction is one of the phenomena that may arise from these contacts with potential dangerous consequences for the integrity of the turbomachine. This paper presents the validation of a 3Dcontact algorithm – within the context of the finite element method – allowing to efficiently study the phenomenon of interaction. It is based on the forward increment Lagrange multiplier method which allows the combination of explicit time integration with the respect of non penetration conditions. This contact algorithm is validated with respect to another algorithm based on an implicit time integration procedure and the commercial software Ansys. It is highlighted in this paper that results obtained with the proposed algorithms match reference results. Also, results emphasize that the presented algorithm allows for energy conservation. This contact algorithm is then used in combination with reduction techniques to simulate a blade-tip/casing contact case with 3D industrial finite element models.
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Submitted on : Friday, November 5, 2010 - 8:09:03 PM
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Alain Batailly, Benoit Magnain, Mathias Legrand, Christophe Pierre. Validation of a 3D contact algorithm for the study of blade-tip/casing contacts in turbomachines. 8th IFToMM International Conference on Rotordynamics, Sep 2010, Séoul, South Korea. ⟨hal-00533382⟩

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