New mass-lumped tetrahedral elements for 3D wave propagation modelling
S. Geevers (University of Twente)
WA Mulder (TU Delft - Applied Geophysics and Petrophysics, Shell)
J van der Vegt (University of Twente)
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Abstract
We present a new accuracy condition for constructing mass-lumped elements. This condition is less restrictive than the one previously used and enabled us to construct new mass-lumped tetrahedral elements for 3D wave propagation modelling. The new degree-2 and degree-3 elements require significantly fewer nodes than previous versions and mass-lumped tetrahedral elements of higher degree had not been found before. We also present a new accuracy condition for evaluating the stiffness matrix-vector product. This enabled us to obtain tailored quadrature rules for the new elements that further reduce the computational cost.