We begin the mathematical study of Isogeometric Analysis based on NURBS (non-uniform rational B-splines). Isogeometric Analysis is a generalization of classical Finite Element Analysis (FEA) which possesses improved properties. For example, NURBS are capable of more precise geometric representation of complex objects and, in particular, can exactly represent many commonly engineered shapes, such as cylinders, spheres and tori. Isogeometric Analysis also simplifies mesh refinement because the geometry is fixed at the coarsest level of refinement and is unchanged throughout the refinement process. This eliminates geometrical errors and the necessity of linking the refinement procedure to a CAD representation of the geometry, as in classical FEA. In this work we study approximation and stability properties in the context of h-refinement. We develop approximation estimates based on a new Bramble–Hilbert lemma in so-called "bent" Sobolev spaces appropriate for NURBS approximations and establish inverse estimates similar to those for finite elements. We apply the theoretical results to several cases of interest including elasticity, isotropic incompressible elasticity and Stokes flow, and advection-diffusion, and perform numerical tests which corroborate the mathematical results. We also perform numerical calculations that involve hypotheses outside our theory and these suggest that there are many other interesting mathematical properties of Isogeometric Analysis yet to be proved.

Basilevs, Y., BEIRAO DA VEIGA, L., Cottrell, J., Hughes, T., Sangalli, G. (2006). Isogeometric Analysis : Approximation, stability and error estimates for h-refined meshes. MATHEMATICAL MODELS AND METHODS IN APPLIED SCIENCES, 16(7), 1031-1090 [10.1142/S0218202506001455].

Isogeometric Analysis : Approximation, stability and error estimates for h-refined meshes

BEIRAO DA VEIGA, LOURENCO
Secondo
;
2006

Abstract

We begin the mathematical study of Isogeometric Analysis based on NURBS (non-uniform rational B-splines). Isogeometric Analysis is a generalization of classical Finite Element Analysis (FEA) which possesses improved properties. For example, NURBS are capable of more precise geometric representation of complex objects and, in particular, can exactly represent many commonly engineered shapes, such as cylinders, spheres and tori. Isogeometric Analysis also simplifies mesh refinement because the geometry is fixed at the coarsest level of refinement and is unchanged throughout the refinement process. This eliminates geometrical errors and the necessity of linking the refinement procedure to a CAD representation of the geometry, as in classical FEA. In this work we study approximation and stability properties in the context of h-refinement. We develop approximation estimates based on a new Bramble–Hilbert lemma in so-called "bent" Sobolev spaces appropriate for NURBS approximations and establish inverse estimates similar to those for finite elements. We apply the theoretical results to several cases of interest including elasticity, isotropic incompressible elasticity and Stokes flow, and advection-diffusion, and perform numerical tests which corroborate the mathematical results. We also perform numerical calculations that involve hypotheses outside our theory and these suggest that there are many other interesting mathematical properties of Isogeometric Analysis yet to be proved.
Articolo in rivista - Articolo scientifico
Advection-diffusion; Approximation; B-splines; Elasticity; Elliptic boundary value problems; Error estimates; Finite elements; h-refinement; Incompressibility; Inverse estimates; NURBS; Stability; Stokes flow
English
1031
1090
60
Basilevs, Y., BEIRAO DA VEIGA, L., Cottrell, J., Hughes, T., Sangalli, G. (2006). Isogeometric Analysis : Approximation, stability and error estimates for h-refined meshes. MATHEMATICAL MODELS AND METHODS IN APPLIED SCIENCES, 16(7), 1031-1090 [10.1142/S0218202506001455].
Basilevs, Y; BEIRAO DA VEIGA, L; Cottrell, J; Hughes, T; Sangalli, G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/99896
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