An hp finite element adaptive scheme to solve the Laplace model for fluid–solid vibrations

• Published in: Computer methods in applied mechanics and engineering 2011, Vol.200 (1-4), p.178-188
• Main Authors: Armentano, M.G., Padra, C., Rodríguez, R., Scheble, M.
• Format: Article
• Language: English
• Subjects: A posteriori error estimates; Computation; Convergence; Errors; Estimates; Estimators; Exact sciences and technology; Finite element method; Finite elements; Fluid–structure interaction; Fundamental areas of phenomenology (including applications); hp Version; Mathematical analysis; Mathematical models; Physics; Solid mechanics; Spectral approximation; Structural and continuum mechanics; Vibration problem; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
• ISSN: 0045-7825; 1879-2138
• DOI: 10.1016/j.cma.2010.08.003

In this paper we introduce an hp finite element method to solve a two-dimensional fluid–structure spectral problem. This problem arises from the computation of the vibration modes of a bundle of parallel tubes immersed in an incompressible fluid. We prove the convergence of the method and a priori error estimates for the eigenfunctions and the eigenvalues. We define an a posteriori error estimator of the residual type which can be computed locally from the approximate eigenpair. We show its reliability and efficiency by proving that the estimator is equivalent to the energy norm of the error up to higher order terms, the equivalence constant of the efficiency estimate being suboptimal in that it depends on the polynomial degree. We present an hp adaptive algorithm and several numerical tests which show the performance of the scheme, including some numerical evidence of exponential convergence.