Numerical study on flow structures of high Reynolds number submerged jet in an axis-symmetric cavity

Large eddy simulation (LES) combined with SchnerrSauer (S-S) cavitation model were employed to study three-dimensional flow structure of submerged jet with high Reynolds number in an axis-symmetric cavity. The Reynolds number of working jet is Re = 2 × 10⁵ and cavitation number is σ = 0.59 in measuring point of experiment. The computational result shows good agreement with experimental results. Compared with free jet flow structure, the confined jet structures shows defection, and the mixing layer isn´t linear diffusion due to effect of impinging edge. The largest velocity fluctuations in different directions occur in vicinity of jet half width line, as well as the x - y Reynolds shear stress. The velocity distributions of different lines show Gauss distribution in diffused section while center line (the largest velocity line in x direction) shift to y > 0 direction. The numbers of vortex on y - z planes in shear layer vary with stream wise length, and the largest vortex structure appears at the domain of x/d1 = 5 - 7 as shown in instantaneous streamlines figures. This indicates that the flow in such domain is the most complicated, and the mixing effect is the strongest.