0 2. Obtain a self-similar solution for the downstream evolution of the two-dimensional wake. We represent the mean streamwise velocity by U U = U(), and the Reynolds shear stress by - puv = pug(), where and g are functions of y/l only (with / being the transverse length scale of the flow.) (a) By substituting into the mean flow streamwise momentum equation, show that a self- similar solution is possible only if the quantities UodUs U dx S and Uo dl U dx are both independent of downstream location (x). (b) By making use also of the momentum integral, show that the self-similar solution has the forms s 1 = Ax/2, U = Bx-1/2, where A and B are constants to be determined.