Move VOF sharpening and diffusion coefficients to be user modifiable

Exawind / nalu-wind

Solver for wind farm simulations targeting exascale computational platforms

https://exawind.github.io/nalu-wind/

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Move VOF sharpening and diffusion coefficients to be user modifiable #1293

Closed wjhorne closed 2 months ago

wjhorne commented 2 months ago

We have found that it is desirable to be able to tune some of the coefficients of VOF, mostly for testing + verification purposes. This PR makes the two most influential coefficients modifiable in a user's input file. The values are defaulted to safe values that have been used in all of our showcases so far. @mbkuhn @psakievich