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http://hdl.handle.net/2445/207171
Title: | 3D magnetotelluric modeling using high-order tetrahedral Nédélec elements on massively parallel computing platforms |
Author: | Castillo Reyes, Octavio Modesto, David Queralt i Capdevila, Pilar Marcuello Pascual, Alejandro Ledo Fernández, Juanjo Amor-Martin, Adrian de la Puente, Josep García-Castillo, Luis Emilio |
Keywords: | Prospecció magnetotel·lúrica Prospecció geofísica Electromagnetisme Magnetotelluric prospecting Geophysical exploration Electromagnetism |
Issue Date: | 1-Mar-2022 |
Publisher: | Elsevier Ltd |
Abstract: | 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. |
Note: | Versió postprint del document publicat a: https://doi.org/10.1016/j.cageo.2021.105030 |
It is part of: | Computers & Geosciences, 2022, vol. 160 |
URI: | http://hdl.handle.net/2445/207171 |
Related resource: | https://doi.org/10.1016/j.cageo.2021.105030 |
ISSN: | 0098-3004 |
Appears in Collections: | Articles publicats en revistes (Dinàmica de la Terra i l'Oceà) |
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