Viscosity solutions for the crystalline mean curvature flow with a nonuniform driving force term

Yoshikazu Giga, Norbert Požár
2020 SN Partial Differential Equations and Applications  
A general purely crystalline mean curvature flow equation with a nonuniform driving force term is considered. The unique existence of a level set flow is established when the driving force term is continuous and spatially Lipschitz uniformly in time. By introducing a suitable notion of a solution a comparison principle of continuous solutions is established for equations including the level set equations. An existence of a solution is obtained by stability and approximation by smoother
more » ... A necessary equi-continuity of approximate solutions is established. It should be noted that the value of crystalline curvature may depend not only on the geometry of evolving surfaces but also on the driving force if it is spatially inhomogeneous.
doi:10.1007/s42985-020-00040-0 fatcat:mywqj23iibhbxeoegnzzmokyxa