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Hybrid-Trefftz displacement element for poroelastic media

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Abstract

The elastodynamic response of saturated poroelastic media is modelled approximating independently the solid and seepage displacements in the domain and the force and pressure components on the boundary of the element. The domain and boundary approximation bases are used to enforce on average the dynamic equilibrium and the displacement continuity conditions, respectively. The resulting solving system is Hermitian, except for the damping term, and its coefficients are defined by boundary integral expressions as a Trefftz basis is used to set up the domain approximation. This basis is taken from the solution set of the governing differential equation and models the free-field elastodynamic response of the medium. This option justifies the relatively high levels of performance that are illustrated with the time domain analysis of unbounded domains.

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Authors and Affiliations

  1. Departamento de Engenharia Civil e Arquitectura, Instituto Superior Técnico, Technical University of Lisbon, Lisbon, Portugal

    J. A. Teixeira de Freitas

  2. Departamento de Engenharia Civil, Faculdade de Engenharia, Universidade Católica Portuguesa, Lisbon, Portugal

    I. D. Moldovan

  3. Departamento de Engenharia Civil, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Lisbon, Portugal

    C. Cismaşiu

Authors
  1. J. A. Teixeira de Freitas
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  2. I. D. Moldovan
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  3. C. Cismaşiu
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Correspondence to J. A. Teixeira de Freitas.

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de Freitas, J.A.T., Moldovan, I.D. & Cismaşiu, C. Hybrid-Trefftz displacement element for poroelastic media. Comput Mech 48, 659–673 (2011). https://doi.org/10.1007/s00466-011-0612-7

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  • DOI: https://doi.org/10.1007/s00466-011-0612-7

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