Preprint
Sep 2026
Low-Order Refined Preconditioning for Spectral/hp Element Method for Complex, 3D Geometries
Low-order refined (LOR) preconditioning replaces a high-order operator with a low-order discretisation on a refined nodal mesh. For tensor-product elements, the two operators are spectrally equivalent with bounds independent of the polynomial order $P$, but the construction does not extend directly to simplex and mixed...
P. Khurana, Henrik Wüstenberg, D. Moxey et al.
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