RT Journal Article
T1 3D Magnetotelluric Modeling Using High-Order Tetrahedral Nédélec Elements on Massively Parallel Computing Platforms
A1 Castillo Reyes, Octavio
A1 Modesto, David
A1 Queralt, Pilar
A1 Marcuello, Alex
A1 Ledo, Juanjo
A1 Amor Martín, Adrián
A1 de la Puente, Josep
A1 García Castillo, Luis Emilio
AB We present a routine for 3D magnetotelluric (MT) modeling based upon high-order edge finite element method (HEFEM), tailored and unstructured tetrahedral meshes, and high-performance computing (HPC). This implementation extends the PETGEM modeller capabilities, initially developed for active-source electromagnetic methods in frequency-domain. We assess the accuracy, robustness, and performance of the code using a set of reference models developed by the MT community in well-known reported workshops. The scale and geological properties of these 3D MT setups are challenging, making them ideal for addressing a rigorous validation. Our numerical assessment proves that this new algorithm can produce the expected solutions for arbitrarily 3D MT models. Also, our extensive experimental results reveal four main insights: (1) high-order discretizations in conjunction with tailored meshes can offer excellent accuracy; (2) a rigorous mesh design based on the skin-depth principle can be beneficial for the solution of the 3D MT problem in terms of numerical accuracy and run-time; (3) high-order polynomial basis functions achieve better speed-up and parallel efficiency ratios than low-order polynomial basis functions on cutting-edge HPC platforms; (4) a triple helix approach based on HEFEM, tailored meshes, and HPC can be extremely competitive for the solution of realistic and complex 3D MT models and geophysical electromagnetics in general.
PB ELSEVIER BV
SN 0098-3004
YR 2022
FD 2022-03
LK https://hdl.handle.net/10016/35433
UL https://hdl.handle.net/10016/35433
LA eng
NO This project has been 65% cofinanced by the European RegionalDevelopment Fund (ERDF) through the Interreg V-A Spain–France–Andorra program (POCTEFA2014-2020). POCTEFA aims to reinforcethe economic and social integration of the French–Spanish–Andorranborder. Its support is focused on developing economic, social andenvironmental cross-border activities through joint strategies favoringsustainable territorial development. BSC authors received fundingfrom the European Union’s Horizon 2020 programme, grant agreementN◦828947 and N◦777778, and from the Mexican Department of Energy,CONACYT-SENER Hidrocarburos grant agreement N◦B-S-69926.
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RD 27 jul. 2024