Fluid Structure Modelling of Ground Excited Vibrations by Mesh Morphing and Modal Superposition
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This paper presents a numerical approach for high fidelity modelling of ground excited vibrations of a structure interacting with surrounding fluid flow. The motion of the structure is represented directly on the CFD model mesh by embedding the structural modes using radial basis functions mesh morphing. Modal forces integrals are computed on the CFD mesh enabling a time marching FSI solution based on the weak approach. Ground vibration is represented by adding a rigid movement and related inertial loads using modal participation factors. The approach is validated by studying a cantilever beam vibrating in air excited by a transversal sine motion applied to the clamped end that is relevant for the design of flapping devices. Numerical results are successfully validated by comparing the coupled and uncoupled response computed according to the proposed approach with the analytic one and to a standard FEA solver.
This research has been partially supported by the Ministerio de Economía y Competitividad of Spain Grants No. DPI2016-76151-C2-1-R and by the European Union within the RIBES project of the 7th Framework aeronautics programme JTI-CS-GRA (Joint Technology Initiatives-Clean Sky-Green Regional Aircraft) under Grant 632556.
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