Diffusion with gradient constraint and evolutive Dirichlet condition

Other: https://purl.pt/3279/1/j-5293-b-vol48-fasc4-art7_PDF/j-5293-b-vol48-fasc4-art7_PDF_01-B-R0300/j-5293-b-vol48-fasc4-art7_0000_capa1-468_t01-B-R0300.pdf