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Curl Curl: Add support for variable alpha#5276

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WeiqunZhang wants to merge 3 commits intoAMReX-Codes:developmentfrom
WeiqunZhang:curl_curl_alpha
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Curl Curl: Add support for variable alpha#5276
WeiqunZhang wants to merge 3 commits intoAMReX-Codes:developmentfrom
WeiqunZhang:curl_curl_alpha

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@WeiqunZhang
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Add support for solving ∇ × α ∇ × E + β E = f, where α can be a nodal MultiFab.

Close #5241

Comment thread Tests/LinearSolvers/CurlCurl/MyTest.cpp Fixed
Add support for solving `∇ × α ∇ × E + β E = f`, where `α` can be a nodal
MultiFab.

Close AMReX-Codes#5241
@WeiqunZhang
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/run-hpsf-gitlab-ci

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GitLab CI has started at https://gitlab.spack.io/amrex/amrex/-/pipelines/1518636.

@WeiqunZhang
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@prkkumar-he Could give this a try?

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GitLab CI 1518636 finished with status: success. See details at https://gitlab.spack.io/amrex/amrex/-/pipelines/1518636.

@BenDavisonPetch
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I've run it on the magnetic diffusion problem described in https://web.mit.edu/6.013_book/www/chapter10/10.4.html and it looks like it is doing the right thing:
image
I need to double check the evolution timescale and diffusion of the z magnetic field component next week, but so far looks great!

@prkkumar-he
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Thanks, @WeiqunZhang! I will try it today.

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Support spatially varying alpha in MLCurlCurl

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