Auxiliary splines space preconditioning for B-splines finite elements: The case of H(curl,Ω) and H(div,Ω) elliptic problems

• Published in: Computers & mathematics with applications (1987) Vol. 159; pp. 102 - 121
• Main Authors: El Akri, A., Jbilou, K., Ratnani, A.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2024
• Subjects: [formula omitted] and [formula omitted] problems; Auxiliary splines space preconditioning; B-splines; GLT theory; Isogeometric analysis (IgA); Preconditioning methods; GLT theory; Isogeometric analysis (IgA); Preconditioning methods; Auxiliary splines space preconditioning; H(curl,Ω) and H(div,Ω) problems; B-splines
• ISSN: 0898-1221; 1873-7668
• DOI: 10.1016/j.camwa.2024.02.001

This paper presents a study of large linear systems resulting from the regular B-splines finite element discretization of the curl−curl and grad−div elliptic problems on unit square/cube domains. We consider systems subject to both homogeneous essential and natural boundary conditions. Our objective is to develop a preconditioning strategy that is optimal and robust, based on the Auxiliary Space Preconditioning method proposed by Hiptmair et al. [48]. Our approach is demonstrated to be robust with respect to mesh size, and we also show how it can be combined with the Generalized Locally Toeplitz (GLT) sequences analysis presented in [59] in order to derive an algorithm that is optimal and stable with respect to spline degree. Numerical tests are conducted to illustrate the effectiveness of our approach.