Absolute Anisotropic Mesh Size
To specify an Absolute anisotropic mesh type, set the Mesh size type to Absolute Anisotropic. This option allows you to enter an absolute size and a tensor that defines the orientation of the anisotropy.
The final mesh size in each direction is computed by multiplying the absolute size by the direction tensor. Note that the tensor must define three orthogonal vectors. The mesher has a practical limit on anisotropy of approximately 5:1. Requests for higher levels of anisotropy in unstructured mesh regions will most likely not be satisfied.