FreeSurface sampler: avoid issues when sampling within numerical beach #1678
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Summary
Because of the volume fraction modification that takes place in numerical beaches and the geometric-VOF assumptions built into the FreeSurface sampler, things can look pretty crazy there. This enables the user to switch to a linear interpolation approach within a specified length from xhi, smoothing things out.
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Checklist
The following is included:
This PR was tested by running:
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