pitzDaily tutorials: updated blockMeshDict files to use multi-grading
The pitzDaily case uses a lot of mesh grading close to walls and the shear layer. Prior to v2.4, blockMesh only permitted grading in one direction within a single block, so the pitzDaily mesh comprised of 13 blocks to accommodate the complex grading pattern. blockMesh has multi-grading that allows users to divide a block in a given direction and apply different grading within each division. The mesh generated with blockMesh using 13 blocks has been replaced with a mesh of 5 blocks that use multi-grading. The new blockMeshDict configuration produces a mesh very similar to the original 13-block mesh.