[firedrake] Anisotropic mesh

Dear all, There seems to be a problem with anisotropic meshes, namely with different number of nodes in each direction. The problem is encountered closer to the x-axis if the x-direction has less points. The situation becomes even worse if I make the domain rectangular and as its length is increased. You can see an example in the attached code which uses UnitSquareMesh(20,80) on a rectangular domain 4 times longer than wide. I am not sure why this is happening, so hopefully someone can help. Kind regards, Anna Kalogirou. P.S. Does Firedrake support the use of quadrilateral meshes? -- Dr Anna Kalogirou Research Fellow School of Mathematics University of Leeds