Take the product of the perturbation velocity equation given by Eq. (17.53) by any component of the perturbation velocity. This results in an equation for \(v_{x}^{\prime} v_{y}^{\prime}\), which is the turbulent stress. Derive this equation and show that the triple correlation terms remain in this equation, which is a part of the closure problem.

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av + V;(v,j) + vj(Vi,j) + v(v,j) = (p'8y/p),j + v(v)).jj + at + (v/v) (17.53)