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

Abstract

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.