A new model is proposed for the two-point correlation spectrum tensor
in which the directional proper ties of the turbulent field can be con
sidered in terms of the specific structural anisotropy tensor, This mo
del was originally devised to deal with the effect of rotation on turb
ulence, but more general closures can be derived from it, for inhomoge
neous turbulence. Applications are described for flows between rotatin
g disks, to illustrate the models capabilities.