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Dissertation
Year: 2018 Publisher: Liège Université de Liège (ULiège)
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The recent implementation of wear models in the nonlinear solver LS-Dyna allows its use in the numerical simulation of Rotor-Stator Interaction for the very first time. The new capabilities of the solver are studied and are compared to the ones of nonlinear solver Metafor, already capable of simulating Rotor-Stator Interaction. Specifically, the feasibility of such simulations is studied, the best suited contact algorithms are selected, and the performance is assessed. To that end, two LS-Dyna models are developed: a basic ONERA test bench whose purpose is to select the most adequate contact models, and a compressor blade rub test whose purpose is to ensure the correct application of wear on the finite elements model. The choice of contact model is constrained by the limited support of wear in the solver. Penalty methods for contact were considered, double-pass algorithms were rejected due to high variation of contact loads, leaving single-pass algorithms. The penalty computation was selected to ensure the least dependence on the mesh. Soft constraint formulation is not fully independent of the mesh, but offers nodal mass normalization. The specificity of wear computation in LS-Dyna is its application in post-processing only, preventing wear affecting the compressor blade dynamics. The simulation of Rotor-Stator Interaction in LS-Dyna thus necessitates extensive use of computation stops and restarts. A fully functional method to compute Rotor-Stator Interaction was successfully developed for LS-Dyna, with performance similar to Metafor.
metafor --- ls-dyna --- dyna --- interaction --- rotor --- stator --- compressor --- wear --- contact --- divergence --- vibration --- safran --- aero --- boosters --- booster --- engine --- low --- pressure --- onera --- model --- finite --- elements --- nonlinear --- explicit --- implicit --- time --- integration --- solver --- gap --- close --- open --- abradable --- material --- Ingénierie, informatique & technologie > Ingénierie aérospatiale
Book
ISBN: 9783944669175 Year: 2013 Publisher: Leipzig Spector books
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