Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling electromagnetics on cylindrical meshes with applications to
  steel-cased wells   Simulating direct current resistivity, frequency domain electromagnetics and
time domain electromagnetics in settings where steel cased boreholes are
present is of interest across a range of applications including well-logging,
monitoring subsurface injections such as hydraulic fracturing or carbon capture
and storage. In some surveys, well-casings have been used as "extended
electrodes" for near surface environmental or geotechnical applications. Wells
are often cased with steel, which has both a high conductivity and a
significant magnetic permeability. The large physical property contrasts as
well as the large disparity in length-scales, which are introduced when a
steel-cased well is in a modeling domain, makes performing an electromagnetic
forward simulation challenging. Using this setting as motivation, we present a
finite volume approach for modeling electromagnetic problems on cylindrically
symmetric and 3D cylindrical meshes which include an azimuthal discretization.
The associated software implementation includes modeling capabilities for
direct current resistivity, time domain electromagnetics, and frequency domain
electromagnetics for models that include variable electrical conductivity and
magnetic permeability. Electric and magnetic fields, fluxes, and charges are
readily accessible in any simulation so that they can be visualized and
interrogated. We demonstrate the value of being able to explore the behaviour
of electromagnetic fields and fluxes through examples which revisit a number of
foundational papers on direct current resistivity and electromagnetics in
steel-cased wells. The software implementation is open source and included as a
part of the SimPEG software ecosystem for simulation and parameter estimation
in geophysics.

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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
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The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: econ
1
The categories of this paper are: cs
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The categories of this paper are: chem-ph