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GfsMetricStretch is used to stretch the mesh uniformly in one or several directions of space.

The syntax in parameter files is:

[ GfsEvent ] { sx = 2. sy = 0.1 sz = 1. }

where (sx,sy,sz) are the factors by which the x,y and z directions of space get rescaled.

Note that the geometric multigrid Poisson solver native to Gerris might struggle when the aspect ratio of the cells becomes large (typically > 5). For high aspect ratios, you can try to use the algebraic solvers of the Hypre library via the Hypre module.


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