
An investigation is conducted regarding the feasibility of approaches for improving the efficiency and stability of existing finite element method (FEM) schemes, taking into account both analytical and numerical studies. Of the four schemes considered for the 'steady' problem, the Hermitian Galerkin formulation appears to be the most efficient and therefore the most suitable scheme for futher full scale implementation. The Hermitian residual least squares (RLS) scheme although comparable in accuracy for the cases considered exhibits a slight tendency to cumulative errors. The performance of both the Lagrangian element schemes considered compares poorly with that of their Hermitian element counterparts. This is particularly true of the Lagrangian RLS scheme. The presence of internal oscillatory components is an inevitable consequence of all Galerkin schemes irrespective of element type.
one-dimensional, Galerkin and residual least squares, accuracy, Hydro- and aero-acoustics, Basic methods in fluid mechanics, significant numerical damping, Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs, stability, linearized acoustical transmission in ducts with flow, 510, spurious nonphysical modes, Lagrangian and Hermitian elements
one-dimensional, Galerkin and residual least squares, accuracy, Hydro- and aero-acoustics, Basic methods in fluid mechanics, significant numerical damping, Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs, stability, linearized acoustical transmission in ducts with flow, 510, spurious nonphysical modes, Lagrangian and Hermitian elements
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