Higher-order mesh generation using CISAMR: A case study on bias in presentation and interpretation of results

• DOI: 10.1016/j.cma.2020.113360
• Publication Date: 2020-08-18T22:12:04Z
• Authors: Mohamad Mohmadsalehi; Anand Nagarajan; Soheil Soghrati
• Keywords: Presentation (obstetrics)

Abstract A modified version of the Conforming to Interface Structured Adaptive Mesh Refinement (CISAMR) algorithm is presented for the construction of higher-order Lagrangian and NURBS-enhanced (NE) finite element meshes. CISAMR non-iteratively transforms a structured grid into a conforming mesh with an upper bound of three on elements aspect ratio. In this work, we introduce new algorithmic aspects for generating higher-order Lagrangian and NE meshes using CISAMR. For each type of element, a comprehensive study is then provided on the performance of first, second, and third-order meshes for solving linear elastic problems with smooth and oscillatory curvilinear edges. Local gradient recovery error and computational cost are used as performance metrics in these examples. Outcomes are then used as a case study to elucidate common sources of bias in presenting and interpreting results. In particular, we show how bias, whether purposeful or not, could lead to misleading conclusions regarding the performance of a method.