Treatment of polar grid singularities in the bi-cubic Hermite-Bézier approximations: isoparametric finite element framework - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Computational Physics Année : 2022

Treatment of polar grid singularities in the bi-cubic Hermite-Bézier approximations: isoparametric finite element framework

Résumé

We propose a numerical treatment for the geometric singularity at the polar grid center encountered in the application of the isoparametric bi-cubic Hemite Bézier finite element method. The treatment applies a set of new basis functions at the polar grid center in the numerical algorithm where the new basis functions are simply the linear transformations of the original basis functions. The linear transformation comes out naturally by analyzing the interpolation formula at the polar grid center. The proposed polar treatment enforces the C 1 regularity in the physical space and preserves the order of the accuracy of the interpolation. The treatment is applied in the nonlinear MHD code JOREK. With the help of a range of numerical tests, it is demonstrated that the polar treatment improves the stability and accuracy of the numerical approximation near the polar grid center. The polar treatment presented can be applied to the grid center of circular or non-circular polar grids and is also applicable for the bi-cubic Hermite finite element method.
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Dates et versions

hal-03781896 , version 1 (20-09-2022)

Identifiants

Citer

Ashish Bhole, Boniface Nkonga, Stanislas Pamela, Guido Huijsmans, Matthias Hoelzl. Treatment of polar grid singularities in the bi-cubic Hermite-Bézier approximations: isoparametric finite element framework. Journal of Computational Physics, 2022, ⟨10.1016/j.jcp.2022.111611⟩. ⟨hal-03781896⟩
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