Quote by jhuleea
Hi all,
Find the principal rates of deformation and principal axes for the flow given by: u = (x,y) and v = 0, satisfying the continuity equation (density = rho = constant)

I guess that continuity should be du_i/dx_i=0 instead of div(u_3)=0.
Anyhew, your solution seems correct up till and including the principal directions (with the note that u=u(y) only, i.e. 2D shear flow). When I calculate the principal values and directions in the old fashion way (as eigenvalues/eigenvectors of the strain rate tensor), I get the same directions, but principal values are +/ du/dy.
Cheers //Rope