Determines the direction in which the dimensions are chosen to compute the blocked index for sorting the mesh points (see MeshBlockSize). The default is increase_with_dimensions, corresponding to xyz ordering in 3D.
The fastest changing index is in the first dimension, i.e., in 3D this
corresponds to ordering in xyz directions.
The fastest changing index is in the last dimension, i.e., in 3D this
corresponds to ordering in zyx directions.
grid/mesh_init.F90 : 853
call parse_variable(namespace, 'MeshBlockDirection', 1, direction)