Add Neumann BC in the LinearFV system#30147

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freiler wants to merge 8 commits intoidaholab:nextfrom freiler:linearFV-add-ons

Commits on Mar 28, 2025

Add Neumann BC in the LinearFV system idaholab#30146
freiler
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Add boolean to identify whether the BC requires a value extrapolation or a gradient extrapolation. Fixes issues with LinearFVDiffusion::computeBoundaryRHSContribution(), where for non-orthogonal me…
freiler
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Add diffusion coefficient to the NeumannBC kernel to correctly compute the boundary value from the flux
freiler
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Adding the diffusion only mms tests without gold files yet. Second order for orthogonal meshes and first order for non-orthogonal meshes
freiler
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Modification of boundary value computation correcting for non-orthogonality. Obtain second order convergence for 2d diffusion in non-orthogonal meshes
freiler
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Add mms tests for advection reaction diffusion. Order of convergence 2.0
freiler
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Remove unnecessary option in LinearFVBoundaryCondition.h and correct format changes
freiler
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Fix test error mms-adr-2d-outflow
freiler
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