In stardesign, using polyhedral cells, does anybody know how to create a mesh with the cell size increasing with distance from a reference point? Thanks

Do you have geometry at the reference point, i.e. are you modelling something like a bluff body in a wind tunnel? If you have a subtracted inner volume, set the triangle size on the surfaces of the inner volume to a smaller value than the global triangle size. You can set triangle size either using a boundary face (applied to all the faces of the subtracted inner volume), or selected the inner faces individually and change the triangle size on the CAD face property page. You might need to use the right mouse button to cycle through hidden faces.