Semianalytical self-similar solution of bent-over jet in cross-flow

The flow and scalar field in the cross section of a bent-over momentum jet in cross-flow has been investigated via a 2D numerical solution of the gove rning equations with similarity transformation. The semianalytical model em ploys a free shear layer model for turbulent closure and the assumption of a constant velocity in the direction of the cross-how the entire solution d epends solely on a dimensionless turbulent mixing patameter lambda that mea sures the relative Importance of advection and diffusion. The computed stre amlines and vorticity field clearly indicate a vortex-pair flow for all lam bda. The shape of the scalar distribution, however, grows from a circular c ell to a kidney-shaped double peak structure. Using a value of lambda = 55, the computed jet trajectory and spreading and the cross-sectional shape ar e in good agreement with the experiments, although the dilution is somewhat overpredicted. The results suggest, a free shear layer model of epsilon = 0.0272W(m)l*, where epsilon, W-m, and l* are the eddy viscosity, maximum ve locity, and half-width in the bent-over jet cross section, respectively.