The value of continuity: Refined isogeometric analysis and fast direct solvers
- Basque Center for Applied Mathematics (BCAM), Bilbao (Spain)
- Basque Center for Applied Mathematics (BCAM), Bilbao (Spain); Univ. of the Basque Country UPV.EHU, Leioa (Spain); Ikerbasque (Basque Foundation for Sciences), Bilbao (Spain)
- King Abdullah Univ. of Science and Technology (KAUST), Thuwal (Saudi Arabia); Consejo Nacional de Investigaciones Cientificas y Tecnicas, Santa Fe (Argentina); Univ. Nacional del Litoral, Santa Fe (Argentina)
- AGH Univ. of Science and Technology, Krakow (Poland)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Curtin Univ., Bentley, WA (Australia); Commonwealth Scientific and Industrial Research Organisation (CSIRO), Kensington, WA (Australia)
We propose the use of highly continuous finite element spaces interconnected with low continuity hyperplanes to maximize the performance of direct solvers. Starting from a highly continuous Isogeometric Analysis (IGA) discretization, we introduce -separators to reduce the interconnection between degrees of freedom in the mesh. By doing so, both the solution time and best approximation errors are simultaneously improved. We call the resulting method “refined Isogeometric Analysis (rIGA)”. To illustrate the impact of the continuity reduction, we analyze the number of Floating Point Operations (FLOPs), computational times, and memory required to solve the linear system obtained by discretizing the Laplace problem with structured meshes and uniform polynomial orders. Theoretical estimates demonstrate that an optimal continuity reduction may decrease the total computational time by a factor between and , with being the polynomial order of the discretization. Numerical results indicate that our proposed refined isogeometric analysis delivers a speed-up factor proportional to . In a mesh with four million elements and , the linear system resulting from rIGA is solved 22 times faster than the one from highly continuous IGA. In a mesh with one million elements and , the linear system is solved 15 times faster for the refined than the maximum continuity isogeometric analysis.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1327763
- Alternate ID(s):
- OSTI ID: 1429198
- Journal Information:
- Computer Methods in Applied Mechanics and Engineering, Journal Name: Computer Methods in Applied Mechanics and Engineering; ISSN 0045-7825
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Dispersion-optimized quadrature rules for isogeometric analysis: Modified inner products, their dispersion properties, and optimally blended schemes
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journal | June 2017 |
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