Stabilization and optimal $L^2$ convergence of Dziuk's method with piecewise linear parametric finite elements for curve-shortening flow

We propose a stabilized version of the fully discrete Dziuk's method for the curve-shortening flow of a closed planar curve with piecewise linear parametric finite elements.

With a carefully designed stabilization term, we are able to show a surprising discrete tangential stability of the Barrett--Garcke--Nürnberg (BGN) type under the parabolic scaling $\tau\simeq h^2$---a feature hidden at the continuous level.

Together with a new super-approximation result for the reversely averaged normal vector of linear elements, this Dziuk-type discrete tangential stability yields optimal $L^2$ convergence.