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Create matrix representation of interpolation, saved in CSR format in the BOUT++ grid file.
dschwoerer
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Mar 12, 2026
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This looks good, however that would require quite significant changes on the BOUT++ side as well.
Needed to enable correct calculation of divergence operator.
Renaming, some refactoring, more documentation, standard CSR output.
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Thanks @dschwoerer . BOUT++ changes in this PR: boutproject/BOUT-dev#3330 . |
In addition to following a field-line from cell center, follow a set of points distributed over each cell. Using Gauss-Legendre points to perform averaging over each cell.
Adds an option to trace multiple field lines per cell (default is 1). Uses Gauss-Legendre points. The resulting maps are used to calculate forward & backward matrices.
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I think it might make sense to allow for multiple target BCs for one cell. That might also help with numerical stability, as you do not get such sharp transitions from "sees a target" to "does not see a target". boutproject/BOUT-dev#3308 would allow to implement this in BOUT++, without having to touch the physics code, if they use the new interface. I am also not sure that boutproject/BOUT-dev#3320 makes sense, if we start computing parallel slices on demand. |
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Define a matrix operation to calculate the forward and backward interpolation.
This enables matrices to be constructed that represent operators such as
Grad_parandDiv_par.